ORCID Profile
0000-0003-1538-1558
Current Organisation
University of Western Australia
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Chemical Oceanography | Oceanography | Environmental Science and Management | Isotope Geochemistry | Geochemistry | Geochronology And Isotope Geochemistry | Chemical Oceanography | Conservation and Biodiversity | Climatology (Incl. Palaeoclimatology) | Ecology | Atmospheric Sciences | Natural Resource Management | Environmental Impact Assessment | Geochronology | Climate Change Processes | Marine And Estuarine Ecology (Incl. Marine Ichthyology) | Conservation And Biodiversity | Global Change Biology | Environmental Sciences Not Elsewhere Classified | Archaeology | Biochemistry And Cell Biology Not Elsewhere Classified | Geology | Physical Geography and Environmental Geoscience | Aboriginal and Torres Strait Islander Archaeology | Atmospheric Aerosols | Biochemistry and Cell Biology not elsewhere classified | Environmental Management And Rehabilitation | Physical Oceanography | Igneous and Metamorphic Petrology | Surfacewater Hydrology | Ore Deposit Petrology | Environmental Management | Environmental Chemistry (incl. Atmospheric Chemistry) | Geology Not Elsewhere Classified | Geochemistry Not Elsewhere Classified | Surfacewater Hydrology | Hydrogeology | Palaeoclimatology | Ecological Applications | Environment And Resource Economics | Inorganic Geochemistry | Biological Oceanography | Mathematical Sciences Not Elsewhere Classified | Ecological Impacts of Climate Change | Ecosystem Function |
ANZSRC Socio-Economic Objective (SEO)
Climate change | Physical and chemical conditions | Effects of Climate Change and Variability on Australia (excl. Social Impacts) | Ecosystem Assessment and Management of Marine Environments | Climate variability | Physical and Chemical Conditions of Water in Marine Environments | Global climate change adaptation measures | Land and water management | Living resources (incl. impacts of fishing on non-target species) | Integrated (ecosystem) assessment and management | Oceanic processes (excl. climate related) | Marine Flora, Fauna and Biodiversity | Ecosystem Adaptation to Climate Change | Climate Change Models | Marine protected areas | Expanding Knowledge in the Earth Sciences | Atmospheric Composition (incl. Greenhouse Gas Inventory) | Tourism not elsewhere classified | Mineral Exploration not elsewhere classified | Integrated (ecosystem) assessment and management | Estuarine and lagoon areas | Earth sciences | Water transport | Physical and Chemical Conditions of Water in Fresh, Ground and Surface Water Environments (excl. Urban and Industrial Use) | Effects of Climate Change and Variability on Antarctic and Sub-Antarctic Environments (excl. Social Impacts) | Ecosystem Assessment and Management of Coastal and Estuarine Environments | Ecosystem Assessment and Management of Fresh, Ground and Surface Water Environments | Climate Change Adaptation Measures | Other | Conserving Aboriginal and Torres Strait Islander Heritage | Exploration | Living resources (flora and fauna) | Physical and chemical conditions | Expanding Knowledge in the Environmental Sciences | Regional planning | Other
Related Links
Publications
Coprecipitation and isotopic fractionation of boron in modern biogenic carbonates
Publisher: Elsevier BV
Date: 10-1991
Temperature and surface-ocean water balance of the mid-Holocene tropical Western Pacific
Publisher: American Association for the Advancement of Science (AAAS)
Date: 13-02-1998
DOI: 10.1126/SCIENCE.279.5353.1014
Abstract: Skeletal Sr/Ca and 18 O/ 16 O ratios in corals from the Great Barrier Reef, Australia, indicate that the tropical ocean surface ∼5350 years ago was 1°C warmer and enriched in 18 O by 0.5 per mil relative to modern seawater. The results suggest that the temperature increase enhanced the evaporative enrichment of 18 O in seawater. Transport of part of the additional atmospheric water vapor to extratropical latitudes may have sustained the 18 O/ 16 O anomaly. The reduced glacial-Holocene shift in seawater 18 O/ 16 O ratio produced by the mid-Holocene 18 O enrichment may help to reconcile the different temperature histories for the last deglaciation given by coral Sr/Ca thermometry and foraminiferal oxygen-isotope records.
Acclimatization of massive reef-building corals to consecutive heatwaves
Publisher: The Royal Society
Date: 06-03-2019
Abstract: Reef-building corals typically live close to the upper limits of their thermal tolerance and even small increases in summer water temperatures can lead to bleaching and mortality. Projections of coral reef futures based on forecasts of ocean temperatures indicate that by the end of this century, corals will experience their current thermal thresholds annually, which would lead to the widespread devastation of coral reef ecosystems. Here, we use skeletal cores of long-lived Porites corals collected from 14 reefs across the northern Great Barrier Reef, the Coral Sea, and New Caledonia to evaluate changes in their sensitivity to heat stress since 1815. High-density ‘stress bands’—indicative of past bleaching—first appear during a strong pre-industrial El Niño event in 1877 but become significantly more frequent in the late twentieth and early twenty-first centuries in accordance with rising temperatures from anthropogenic global warming. However, the proportion of cores with stress bands declines following successive bleaching events in the twenty-first century despite increasing exposure to heat stress. Our findings demonstrate an increase in the thermal tolerance of reef-building corals and offer a glimmer of hope that at least some coral species can acclimatize fast enough to keep pace with global warming.
Geochemistry of large benthic foraminifera Amphisorus hemprichii as a high-resolution proxy for lead pollution in coastal environments
Publisher: Elsevier BV
Date: 2021
East African soil erosion recorded in a 300 year old coral colony from Kenya
Publisher: American Geophysical Union (AGU)
Date: 22-02-2007
DOI: 10.1029/2006GL028525
Atmospheric forcing intensifies the effects of regional ocean warming on reef-scale temperature anomalies during a coral bleaching event
Publisher: American Geophysical Union (AGU)
Date: 09-2013
DOI: 10.1002/JGRC.20338
A universal multi-trace element calibration for reconstructing sea surface temperatures from long-lived Porites corals: Removing ‘vital-effects’
Publisher: Elsevier BV
Date: 10-2018
Mid-Holocene variability in the marine 14C reservoir age for northern coastal Papua New Guinea
Publisher: Elsevier BV
Date: 08-2008
Tracing the source of sediment and phosphorus into the Great Barrier Reef lagoon
Publisher: Elsevier BV
Date: 05-2003
Sourcing sediment using multiple tracers in the catchment of Lake Argyle, Northwestern Australia
Publisher: Springer Science and Business Media LLC
Date: 05-2002
DOI: 10.1007/S00267-001-0049-4
Abstract: Control of sedimentation in large reservoirs requires soil conservation at the catchment scale. In large, heterogeneous catchments, soil conservation planning needs to be based on sound information, and set within the framework of a sediment budget to ensure that all of the potentially significant sources and sinks are considered. The major sources of sediment reaching the reservoir, Lake Argyle, in tropical northwestern Australia, have been determined by combining measured sediment fluxes in rivers with spatial tracer-based estimates of proportional contributions from tributaries of the main stream entering the lake, the Ord River. The spatial tracers used are mineral particle magnetics, the strontium isotopic ratio, and the neodymium isotopic ratio. Fallout of 137Cs has been used to estimate the proportion of the sediment in Lake Argyle eroded from surface soils by sheet and rill erosion, and, by difference, the proportion eroded from subsurface soils by gully and channel erosion. About 96% of the sediment in the reservoir has come from less than 10% of the catchment, in the area of highly erodible soils formed on Cambrian-age sedimentary rocks. About 80% of the sediment in the reservoir has come from gully and channel erosion. A major catchment revegetation program, designed to slow sedimentation in the reservoir, appears to have had little effect because it did not target gullies, the major source of sediment. Had knowledge of the sediment budget been available before the revegetation program was designed, an entirely different approach would have been taken.
Ocean Science: Preindustrial to modern interdecadal variability in coral reef pH
Publisher: American Association for the Advancement of Science (AAAS)
Date: 30-09-2005
Abstract: The oceans are becoming more acidic due to absorption of anthropogenic carbon dioxide from the atmosphere. The impact of ocean acidification on marine ecosystems is unclear, but it will likely depend on species adaptability and the rate of change of seawater pH relative to its natural variability. To constrain the natural variability in reef-water pH, we measured boron isotopic compositions in a ∼300-year-old massive Porites coral from the southwestern Pacific. Large variations in pH are found over ∼50-year cycles that covary with the Interdecadal Pacific Oscillation of ocean-atmosphere anomalies, suggesting that natural pH cycles can modulate the impact of ocean acidification on coral reef ecosystems.
Coral reef death during the 1997 Indian Ocean Dipole linked to Indonesian wildfires
Publisher: American Association for the Advancement of Science (AAAS)
Date: 15-08-2003
Abstract: Geochemical anomalies and growth discontinuities in Porites corals from western Sumatra, Indonesia, record unanticipated reef mortality during anomalous Indian Ocean Dipole upwelling and a giant red tide in 1997. Sea surface temperature reconstructions show that although some past upwelling events have been stronger, there were no analogous episodes of coral mortality during the past 7000 years, indicating that the 1997 red tide was highly unusual. We show that iron fertilization by the 1997 Indonesian wildfires was sufficient to produce the extraordinary red tide, leading to reef death by asphyxiation. These findings highlight tropical wildfires as an escalating threat to coastal marine ecosystems.
Sub‐Permil Interlaboratory Consistency for Solution‐Based Boron Isotope Analyses on Marine Carbonates
Publisher: Wiley
Date: 11-11-2020
DOI: 10.1111/GGR.12364
Magma genesis and mantle heterogeneity in the Manus back-arc basin, Papua New Guinea
Publisher: Oxford University Press (OUP)
Date: 2003
Geochemical and Sr-Nd isotopic mapping of source provinces for the Mawson charnockites, east Antarctica: implications for Proterozoic tectonics and Gondwana reconstruction
Publisher: Elsevier BV
Date: 12-1997
Petrology, geochronology and isotope geochemistry of the post-1820 Ma granites of the Mount Isa Inlier: mechanisms for the generation of Proterozoic anorogenic granites
Publisher: Elsevier BV
Date: 10-1988
Sm-Nd and Rb-Sr chronology of continental crust formation
Publisher: American Association for the Advancement of Science (AAAS)
Date: 02-06-1978
DOI: 10.1126/SCIENCE.200.4345.1003
Abstract: Samarium-neodymium and rubidium-strontium isotopic systematics together with plausible assumptions regarding the geochemical evlution of continental crust material, have been used to ascertain the times at which segments of continental crust were formed. Analyses of composites from the Canadian Shield representing portions of the Superior, Slave, and Churchill structural provinces indicate that these provinces were all formed within the period 2.5 to 2.7 aeons. It has been possible to determine the mean age of sediment provenances, as studies of sedimentary rocks suggest that the samarium-neodymium isotopic system is not substantially disturbed during sedimentation or diagenesis.
Suborbital-period sea-level oscillations during marine isotope substages 5a and 5c
Publisher: Elsevier BV
Date: 08-2004
The provenance of Archean clastic metasediments in the Narryer Gneiss Complex, Western Australia: Trace element geochemistry, Nd isotopes, and U-Pb ages for detrital zircons
Publisher: Elsevier BV
Date: 07-1991
A high-resolution Sr/Ca and δ18O coral record from the Great Barrier Reef, Australia, and the 1982–1983 El Niño
Publisher: Elsevier BV
Date: 06-1994
Reply to the Comment by J. P. Hogan on Lead isotopic evidence for deep crustal-scale fluid transport during granite petrogenesis
Publisher: Elsevier BV
Date: 1995
Flow-driven micro-scale pH variability affects the physiology of corals and coralline algae under ocean acidification
Publisher: Springer Science and Business Media LLC
Date: 06-09-2019
DOI: 10.1038/S41598-019-49044-W
Abstract: Natural variability in pH in the diffusive boundary layer (DBL), the discrete layer of seawater between bulk seawater and the outer surface of organisms, could be an important factor determining the response of corals and coralline algae to ocean acidification (OA). Here, two corals with different morphologies and one coralline alga were maintained under two different regimes of flow velocities, pH, and light intensities in a 12 flumes experimental system for a period of 27 weeks. We used a combination of geochemical proxies, physiological and micro-probe measurements to assess how these treatments affected the conditions in the DBL and the response of organisms to OA. Overall, low flow velocity did not ameliorate the negative effect of low pH and therefore did not provide a refugia from OA. Flow velocity had species-specific effects with positive effects on calcification for two species. pH in the calcifying fluid (pH cf ) was reduced by low flow in both corals at low light only. pH cf was significantly impacted by pH in the DBL for the two species capable of significantly modifying pH in the DBL. The dissolved inorganic carbon in the calcifying fluid (DIC cf ) was highest under low pH for the corals and low flow for the coralline, while the saturation state in the calcifying fluid and its proxy (FWHM) were generally not affected by the treatments. This study therefore demonstrates that the effects of OA will manifest most severely in a combination of lower light and lower flow habitats for sub-tropical coralline algae. These effects will also be greatest in lower flow habitats for some corals. Together with existing literature, these findings reinforce that the effects of OA are highly context dependent, and will differ greatly between habitats, and depending on species composition.
The timing of sea-level high-stands during Marine Isotope Stages 7.5 and 9: Constraints from the uranium-series dating of fossil corals from Henderson Island
Publisher: Elsevier BV
Date: 06-2010
Factors affecting B/Ca ratios in synthetic aragonite
Publisher: Elsevier BV
Date: 10-2016
Orbital Forcing of the Marine Isotope Stage 9 Interglacial
Publisher: American Association for the Advancement of Science (AAAS)
Date: 12-01-2001
DOI: 10.1126/SCIENCE.291.5502.290
Abstract: Milankovitch orbital forcing theory has been used to assign time scales to many paleoclimate records. However, the validity of this theory remains uncertain, and independent sea-level chronologies used to test its applicability have been restricted largely to the past ∼135,000 years. Here, we report U-series ages for coral reefs formed on Henderson Island during sea-level high-stands occurring at ∼630,000 and ∼330,000 years ago. These data are consistent with the hypothesis that interglacial climates are forced by Northern Hemisphere summer solar insolation centered at 65°N latitude, as predicted by Milankovitch theory.
Resilience of coral calcification to extreme temperature variations in the Kimberley region, northwest Australia
Publisher: Springer Science and Business Media LLC
Date: 09-08-2015
Nd-Sr isotopic and trace element geochemistry of river sediments and soils in a fertilized catchment, New South Wales, Australia
Publisher: Elsevier BV
Date: 1999
Resistance of corals and coralline algae to ocean acidification: physiological control of calcification under natural pH variability
Publisher: The Royal Society
Date: 08-08-2018
Abstract: Ocean acidification is a threat to the continued accretion of coral reefs, though some undergo daily fluctuations in pH exceeding declines predicted by 2100. We test whether exposure to greater pH variability enhances resistance to ocean acidification for the coral Goniopora sp. and coralline alga Hydrolithon reinboldii from two sites: one with low pH variability (less than 0.15 units daily Shell Island) and a site with high pH variability (up to 1.4 pH units daily Tallon Island). We grew populations of both species for more than 100 days under a combination of differing pH variability (high/low) and means (ambient pH 8.05/ocean acidification pH 7.65). Calcification rates of Goniopora sp. were unaffected by the examined variables. Calcification rates of H. reinboldii were significantly faster in Tallon than in Shell Island in iduals, and Tallon Island in iduals calcified faster in the high variability pH 8.05 treatment compared with all others. Geochemical proxies for carbonate chemistry within the calcifying fluid (cf) of both species indicated that only mean seawater pH influenced pH cf . pH treatments had no effect on proxies for Ω cf . These limited responses to extreme pH treatments demonstrate that some calcifying taxa may be capable of maintaining constant rates of calcification under ocean acidification by actively modifying Ω cf .
Structure and growth rates of the high-latitude coral: Plesiastrea versipora
Publisher: Springer Science and Business Media LLC
Date: 02-08-2009
Discussion and reply dampier ridge, tasman sea, as a stranded continental fragment
Publisher: Informa UK Limited
Date: 04-1995
First ROV Exploration of the Perth Canyon: Canyon Setting, Faunal Observations, and Anthropogenic Impacts
Publisher: Frontiers Media SA
Date: 12-04-2019
Resilience of cold-water scleractinian corals to ocean acidification: Boron isotopic systematics of pH and saturation state up-regulation
Publisher: Elsevier BV
Date: 06-2012
Multi-trace-element sea surface temperature coral reconstruction for the southern Mozambique Channel reveals teleconnections with the tropical Atlantic
Publisher: Copernicus GmbH
Date: 04-02-2019
Abstract: Abstract. Here we report seasonally resolved sea surface temperatures for the southern Mozambique Channel in the SW Indian Ocean based on multi-trace-element temperature proxy records preserved in two Porites sp. coral cores. Particularly, we assess the suitability of both separate and combined Sr∕Ca and Li∕Mg proxies for improved multielement SST reconstructions. Overall, geochemical records from Europa Island Porites sp. highlight the potential of Sr∕Ca and Li∕Mg ratios as high-resolution climate proxies but also show significant differences in their response at this Indian Ocean subtropical reef site. Our reconstruction from 1970 to 2013 using the Sr∕Ca SST proxy reveals a warming trend of 0.58±0.1 ∘C in close agreement with instrumental data (0.47±0.07 ∘C) over the last 42 years (1970–2013). In contrast, the Li∕Mg showed unrealistically large warming trends, most probably caused by uncertainties around different uptake mechanisms of the trace elements Li and Mg and uncertainties in their temperature calibration. In our study, Sr∕Ca is superior to Li∕Mg to quantify absolute SST and relative changes in SST. However, spatial correlations between the combined detrended Sr∕Ca and Li∕Mg proxies compared to instrumental SST at Europa revealed robust correlations with local climate variability in the Mozambique Channel and teleconnections to regions in the Indian Ocean and southeastern Pacific where surface wind variability appeared to dominate the underlying pattern of SST variability. The strongest correlation was found between our Europa SST reconstruction and instrumental SST records from the northern tropical Atlantic. Only a weak correlation was found with ENSO, with recent warm anomalies in the geochemical proxies coinciding with strong El Niño or La Niña. We identified the Pacific–North American (PNA) atmospheric pattern, which develops in the Pacific in response to ENSO, and the tropical North Atlantic SST as the most likely causes of the observed teleconnections with the Mozambique Channel SST at Europa.
143Nd/144Nd, 87Sr/86Sr and trace element constraints on the petrogenesis of Aleutian island arc magmas
Publisher: Elsevier BV
Date: 12-1981
Petrogenetic applications of the40K40Ca radiogenic decay scheme - A reconnaissance study
Publisher: Elsevier BV
Date: 09-1989
Coral Record of Equatorial Sea-Surface Temperatures During the Penultimate Deglaciation at Huon Peninsula
Publisher: American Association for the Advancement of Science (AAAS)
Date: 08-01-1999
DOI: 10.1126/SCIENCE.283.5399.202
Abstract: Uplifted coral terraces at Huon Peninsula, Papua New Guinea, preserve a record of sea level, sea-surface temperature, and salinity from the penultimate deglaciation. Remnants have been found of a shallow-water reef that formed during a pause, similar to the Younger Dryas, in the penultimate deglaciation at 130,000 ± 2000 years ago, when sea level was 60 to 80 meters lower than it is today. Porites coral, which grew during this period, has oxygen isotopic values and strontium/calcium ratios that indicate that sea-surface temperatures were much cooler (22° ± 2°C) than either Last Interglacial or present-day tropical temperatures (29° ± 1°C). These observations provide further evidence for a major cooling of the equatorial western Pacific followed by an extremely rapid rise in sea level during the latter stages of Termination II.
Source and supply of sediment to a shoreline salient in a fringing reef environment
Publisher: Wiley
Date: 19-10-2018
DOI: 10.1002/ESP.4516
A coralline alga gains tolerance to ocean acidification over multiple generations of exposure
Publisher: Springer Science and Business Media LLC
Date: 20-01-2020
An assessment of an environmental gradient using coral geochemical records, Whitsunday Islands, Great Barrier Reef, Australia
Publisher: Elsevier BV
Date: 2012
DOI: 10.1016/J.MARPOLBUL.2011.09.030
Abstract: Coral cores were collected along an environmental and water quality gradient through the Whitsunday Island group, Great Barrier Reef (Australia), for trace element and stable isotope analysis. The primary aim of the study was to examine if this gradient could be detected in coral records and, if so, whether the gradient has changed over time with changing land use in the adjacent river catchments. Y/Ca was the trace element ratio which varied spatially across the gradient, with concentrations progressively decreasing away from the river mouths. The Ba/Ca and Y/Ca ratios were the only indicators of change in the gradient through time, increasing shortly after European settlement. The Mn/Ca ratio responded to local disturbance related to the construction of tourism infrastructure. Nitrogen isotope ratios showed no apparent trend over time. This study highlights the importance of site selection when using coral records to record regional environmental signals.
Impact of European settlement and land use changes on Great Barrier Reef river catchments reconstructed from long-term coral Ba/Ca records
Publisher: Elsevier BV
Date: 07-2022
DOI: 10.1016/J.SCITOTENV.2022.154461
Abstract: The increase in sediment and nutrient loads entering the coastal waters of the Great Barrier Reef (GBR) and the associated degradation of water quality represents a major threat to coral reefs. Although the strengthening of preventative management strategies remains a priority, there is a general lack of terrestrial runoff baseline information with respect to the spatial and temporal severity of disturbances associated with ongoing European-style land use practices. Here we use new and existing high-resolution coral Ba/Ca and luminescence records from the central Cairns region to the southern GBR shelf to reconstruct sediment fluxes discharged into the GBR from before European settlement in the 1860s to the present-day. Since the commencement of European settlement in the 1860s we document a tripling of flood-plume suspended sediment loads delivered by the Burdekin River to the GBR lagoon relative to 'natural' pre-European baseline levels. We show that this is indicative of a much more extreme degradation of the river catchments than hitherto appreciated with intensified discharge events particularly from the central and southern catchments carrying higher sediment loads. More-over from the 1930s onwards the Burdekin River, the largest source of both sediment and freshwater to the GBR, has also exhibited a progressive northwards expansion of its flood plume. This, together with increased variability of freshwater inputs indicated by coral luminescence records, now shows that the inner GBR not only continues to be impacted by increasing sediment/nutrient loads but is also subject to higher intensity river discharge events due to the loss of ground cover causing increased overland runoff and erosion.
Impacts of coral bleaching on pH and oxygen gradients across the coral concentration boundary layer: a microsensor study
Publisher: Springer Science and Business Media LLC
Date: 09-08-2018
Innovation and productivity: insights from Malaysia's logistics industry
Publisher: Informa UK Limited
Date: 11-09-2015
Pleistocene extinction of Genyornis newtoni: Human impact on Australian megafauna
Publisher: American Association for the Advancement of Science (AAAS)
Date: 08-01-1999
DOI: 10.1126/SCIENCE.283.5399.205
Abstract: More than 85 percent of Australian terrestrial genera with a body mass exceeding 44 kilograms became extinct in the Late Pleistocene. Although most were marsupials, the list includes the large, flightless mihirung Genyornis newtoni . More than 700 dates on Genyornis eggshells from three different climate regions document the continuous presence of Genyornis from more than 100,000 years ago until their sudden disappearance 50,000 years ago, about the same time that humans arrived in Australia. Simultaneous extinction of Genyornis at all sites during an interval of modest climate change implies that human impact, not climate, was responsible.
Coral calcifying fluid aragonite saturation states derived from Raman spectroscopy
Publisher: Copernicus GmbH
Date: 29-06-2017
DOI: 10.5194/BG-2017-194
Abstract: Abstract. Quantifying the saturation state of aragonite (ΩAr) within the calcifying fluid of corals is critical for understanding their biomineralisation process and sensitivity to environmental changes including ocean acidification. Recent advances in microscopy, microprobes, and isotope geochemistry allow determination of calcifying fluid pH and [CO32−], but direct quantification of ΩAr (where ΩAr =[CO32−][Ca2+]/Ksp) has proved elusive. Here we test a new technique for deriving ΩAr based on Raman spectroscopy. First, we analysed abiogenic aragonite crystals precipitated under a range of ΩAr from 10 to 34, and found a strong dependence of Raman peak width on ΩAr that was independent of other factors including pH, Mg/Ca partitioning, and temperature. Validation of our Raman technique for corals is difficult because there are presently no direct measurements of calcifying fluid ΩAr available for comparison. However, Raman analysis of the international coral standard JCp-1 produced ΩAr of 12.3 ± 0.3, which we demonstrate is consistent with published skeletal Sr/Ca, Mg/Ca, B/Ca, δ44Ca, and δ11B data. Raman measurements are rapid (≤ 1 s), high-resolution (
A new coral reef province in the Gulf of Carpentaria, Australia: Colonisation, growth and submergence during the early Holocene
Publisher: Elsevier BV
Date: 05-2008
Interactions between filamentous turf algae and coralline algae are modified under ocean acidification
Publisher: Elsevier BV
Date: 07-2014
Unveiling the Perth Canyon and its deep-water faunas
Publisher: Copernicus GmbH
Date: 02-08-2018
DOI: 10.5194/BG-2018-319
Abstract: Abstract. The Perth Canyon is a prominent submarine valley system in the southeast Indian Ocean that incises the southwest Australian continental shelf. It is characterised by two main steep-sided valleys forming a V-shaped configuration that extend from a depth of ~ 600 m to the abyssal plain at ~ 4000 m. Despite its prominence and location of only ~ 27 nautical miles (50 km) offshore, this study represents the first ROV-based exploration of the canyon and its inhabitants. ROV surveys revealed quiescent environments, the structure essentially representing a fossil canyon system with localised occurrences of significant mega- and macrobenthos in the depth range of ~ 680 to ~ 1800 m. The patchy distribution of canyon life comprised corals, sponges, molluscs, echinoderms, crustaceans, brachiopods, and worms, as well as plankton and nekton (various fish species) especially near benthic communities. High definition video surveys and biomass s ling were complemented by ship-based multi-beam bathymetry, and seawater CTD profiling and chemical analyses. ROV transects were conducted at six geomorphologically distinct locations, from the head to the mouth of the canyon and on the northern shelf plateau. The es traversed the generally featureless muddy canyon floor, along near vertical walls, and onto the canyon rim. ROV imaging revealed typically massive and well-bedded sedimentary units that are variably lithified and mostly friable. Biostratigraphic and palaeoecological analysis of foraminifers from rock and sediment s les (~ 700 to 1600 m) indicate that they were deposited from the Late Paleocene to Early Oligocene within upper-middle bathyal (~ 200 to ~ 700 m) water depths, thus implying that significant subsidence has occurred. Strontium isotope (87Sr/86Sr) dating also suggests the presence of Early Miocene sediments at the shallower sites. Settlement of large benthic sessile organisms is largely limited to indurated substrates mostly along the canyon walls. Corals were specifically targeted, with solitary (Desmophyllum dianthus, Caryophyllia sp., Vaughanella sp., and Polymyces sp.) and colonial (Solenosmilia variabilis) scleractinians found sporadically distributed along the walls and beneath overhangs in the deeper canyon valleys as well as along the canyon rims. Gorgonian, bamboo, and proteinaceous corals were also present with noticeable patches of live Corallium hosting a erse community of organisms. Extensive coral graveyards were discovered between ~ 690–720 m and 1560–1790 m comprising colonial (S. variabilis) and solitary (D. dianthus) scleractinians, which had flourished during the last ice age between ~ 18 ka to 33 ka (BP). Faunal s ling (674 m to 1815 m) spans the intermediate and deep waters, which were identified as Antarctic Intermediate Water and Upper Circumpolar Deep Water, with temperatures of ~ 2.5 to ~ 6 °C. The carbonate chemistry of those water depths show supersaturation (Ωcalc ~ 1.3 to 2.2) with respect to calcite, but mild saturation to undersaturation (Ωarag ~ 0.8 to 1.4) with respect to aragonite. Notably, some scleractinians inhabit depths below the aragonite saturation horizon (~ 1000 m). Depth profile measurements of δ13C and nuclear bomb produced Δ14C show decreases within the upper canyon waters of up to ~ 0.8 ‰ (
Geochemical and NdSr isotopic composition of deep-sea turbidites: Crustal evolution and plate tectonic associations
Publisher: Elsevier BV
Date: 07-1990
Screen Magnification for Readers with Low Vision: A Study on Usability and Performance
Publisher: ACM
Date: 22-10-2023
High-resolution coral records of rare earth elements in coastal seawater: Biogeochemical cycling and a new environmental proxy
Publisher: Elsevier BV
Date: 05-2004
Intraplate-type magmatism in a continent-island-arc collision zone: Porgera Intrusive Complex, Papua New Guinea
Publisher: Geological Society of America
Date: 1990
Magnesium isotopic analysis of olivine by laser-ablation multi-collector ICP-MS: Composition dependent matrix effects and a comparison of the Earth and Moon
Publisher: Royal Society of Chemistry (RSC)
Date: 2006
DOI: 10.1039/B510719A
Strontium isotope variations in single ostracod valves from the Gulf of Carpentaria, Australia: A palaeoenvironmental indicator
Publisher: Elsevier BV
Date: 07-1989
Rapid, high-precision measurements of boron isotopic compositions in marine carbonates
Publisher: Wiley
Date: 07-11-2014
DOI: 10.1002/RCM.7065
Abstract: The isotopic composition and elemental abundance of boron (B) in marine carbonates provide a powerful tool for tracking changes in seawater pH and carbonate chemistry. Progress in this field has, however, been h ered by the volatile nature of B, its persistent memory, and other uncertainties associated with conventional chemical extraction and mass spectrometric measurements. Here we show that for marine carbonates, these limitations can be overcome by using a simplified, low-blank, chemical extraction technique combined with robust multi-collector inductively couple plasma mass spectrometry (MC-ICPMS) methods. S les are dissolved in dilute HNO3 and loaded first onto on a cation-exchange column with the major cations (Ca, Mg, Sr, Na) being quantitatively retained while the B fraction is carried in the eluent. The eluent is then passed directly through an anion column ensuring that any residual anions, such as SO4(2-), are removed. Isotopic measurements of (11)B/(10)B ratios are undertaken by matching both the B concentration and the isotopic compositions of the s les with the bracketing standard, thereby minimising corrections for cross-contamination. The veracity of the MC-ICPMS procedure is demonstrated using a gravimetrically prepared laboratory standard, UWA24.7, relative to the international reference standard NIST SRM 951 (δ(11)B = 0‰). This gives values consistent with gravimetry (δ(11)B = 24.7 ± 0.3‰ 2sd) for solutions ranging in concentration from 50 to 500 ppb, equivalent to ~2-10 mg size coral s les. The overall integrity of the method for carbonate analysis is demonstrated by measurements of the international carbonate standard JCp-1 (δ(11)B = 24.3 ± 0.34‰ 2sd). A streamlined, integrated approach is described here that enables rapid, accurate, high-precision measurements of boron isotopic compositions and elemental abundances in commonly analysed biogenic carbonates, such as corals, bivalves, and large benthic forams. The overall simplicity of this robust approach should greatly facilitate the wider application of boron isotope geochemistry, especially to marine carbonates.
The Rayner Complex of East Antarctica: complex isotopic systematics within a Proterozoic mobile belt
Publisher: Wiley
Date: 1987
In situ Nd-143/Nd-144 in LREE-rich minerals via LA-MC-ICPMS
Publisher: Elsevier BV
Date: 08-2006
Controls on sediment provenance in the Baghmati river catchment, Central Himalaya, India
Publisher: Springer Science and Business Media LLC
Date: 07-01-2022
500 ka precipitation record from southeastern Australia: Evidence for interglacial relative aridity
Publisher: Geological Society of America
Date: 1998
Global declines in coral reef calcium carbonate production under ocean acidification and warming
Publisher: Proceedings of the National Academy of Sciences
Date: 10-05-2021
Abstract: The growth of coral reefs is threatened by the dual stressors of ocean warming and acidification. Despite a wealth of studies assessing the impacts of climate change on in idual taxa, projections of their impacts on coral reef net carbonate production are limited. By projecting impacts across 233 different locations, we demonstrate that the majority of coral reefs will be unable to maintain positive net carbonate production globally by the year 2100 under representative concentration pathways RCP4.5 and 8.5, while even under RCP2.6, coral reefs will suffer reduced accretion rates. Our results provide quantitative projections of how different climate change stressors will influence whole ecosystem carbonate production across coral reefs in all major ocean basins.
Proliferation and demise of Mediterranean deep-sea corals
Publisher: Elsevier BV
Date: 08-2006
Mass spectrometric isotope dilution analyses of tin in stony meteorites and standard rocks
Publisher: Elsevier BV
Date: 06-1974
Contemporary changes in continental runoff: Evidence for increased sediment and freshwater fluxes into the Great Barrier Reef
Publisher: Elsevier BV
Date: 08-2006
High-Precision MC-ICP-MSMeasurements of d11B: Matrix Effects in Direct Injection andSpray Chamber SampleIntroduction Systems
Publisher: The Royal Society of Chemistry
Date: 11-09-2014
DOI: 10.1039/9781782625025-00251
Abstract: Multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) is increasingly being adopted for measurements of δ11B with several approaches being adopted to overcome inherent issues of high blank or memory during s le introduction. Here we examine the advantages of direct injection of s les versus use of a cyclonic spray chamber introduction system and the effects of different matrices. Consistent with previous reports, direct injection yielded faster washout times and reduced memory compared to the spray chamber however, signal intensity drifted over time, requiring periodic retuning, and the system was not robust to bubbles in the s le introduction line. The more conventional spray chamber approach, due to its larger surface area, required long washout times to reduce memory to acceptable levels, but the system was stable over time and robust to air introduction. We assessed the sensitivity of both direct injection and spray chamber s le introduction methods to matrix induced biases, in particular the effects of anions and different acid types (nitric versus hydrochloric acid) as well as the sensitivity to differing acid concentrations in s le-standard bracketing. Chloride had the largest influence on the measured δ11B values, with direct injection exhibiting shifts in δ11B of up to ∼−4‰ for changes in hydrochloric acid concentration from 0.1 to 0.2 N. In contrast, similar variations in nitric acid concentrations between s le and standard had comparatively little effect (& .5‰). In addition measurements made via direct injection were more sensitive to the presence of sulfate. Thus, while direct injection has much reduced memory it is generally a less robust measurement system compared to spray chamber s le introduction. However, we show that by operating below matrix-critical thresholds both direct injection and spray chamber methods yield comparable values, with direct injection having the advantage of faster washout times, allowing increased s le throughput and analysis of smaller s le volumes.
First assessment of anthropogenic impacts in submarine canyon systems off southwestern Australia
Publisher: Elsevier BV
Date: 2023
DOI: 10.1016/J.SCITOTENV.2022.159243
Abstract: We assessed the anthropogenic impacts on southwestern Australian submarine canyons by quantifying macro-litter discovered during Remotely Operated Vehicle surveys. The study area encompasses the Bremer canyon systems and Perth Canyon. The categories of macro-litter identified by our study are plastic, metal, aluminium, glass, fabric, mixed, derelict fishing gear, and unclassified. The anthropogenic impacts in the canyons explored is minimal, especially in the Bremer canyon systems, whereas Perth Canyon has comparatively more macro-litter, presumably due to intense maritime traffic and nearby urban development. On a global scale, however, the environmental status of southwestern Australian canyons is relatively pristine. This analysis provides a baseline for the monitoring and enduring stewardship of these habitats where lush and erse biota, including deep-sea corals, thrive.
The geochemistry and petrogenesis of basalts from the Taupo Volcanic Zone and Kermadec Island Arc, S.W. Pacific
Publisher: Elsevier BV
Date: 1993
Geochemical and Nd isotopic systematics of granites from the Arunta Inlier, central Australia: implications for Proterozoic crustal evolution
Publisher: Elsevier BV
Date: 02-1995
PROGRESSIVE GROWTH OF THE EARTHS CONTINENTAL-CRUST AND DEPLETED MANTLE - GEOCHEMICAL CONSTRAINTS
Publisher: Elsevier BV
Date: 11-1994
Long-term anthropogenic change in South Australian gulfs recorded by the faviid coral Plesiastrea versipora
Publisher: Elsevier BV
Date: 08-2006
Coralline algae elevate pH at the site of calcification under ocean acidification
Publisher: Wiley
Date: 02-04-2017
DOI: 10.1111/GCB.13673
Abstract: Coralline algae provide important ecosystem services but are susceptible to the impacts of ocean acidification. However, the mechanisms are uncertain, and the magnitude is species specific. Here, we assess whether species-specific responses to ocean acidification of coralline algae are related to differences in pH at the site of calcification within the calcifying fluid/medium (pH
Nd- Sr isotopic study of primitive lavas from the Troodos ophiolite, Cyprus: evidence for a subduction-related setting.
Publisher: Geological Society of America
Date: 1983
Response to Comment on Preindustrial to Modern Interdecadal Variability in Coral Reef pH
Publisher: American Association for the Advancement of Science (AAAS)
Date: 27-10-2006
Abstract: Coral reefs are exceptional environments where changes in calcification, photosynthesis, and respiration induce large temporal variations of pH. We argue that boron isotopic variations in corals provide a robust proxy for paleo-pH which, together with the likely concomitant changes in the reconstructed partial pressure of CO 2 ( P CO 2 ) calculated by Matear and McNeil, fall within ranges that are typical of modern coral reef ecosystems.
Strontium/calcium ratios in modern porites corals from the Great Barrier Reef as a proxy for sea surface temperature: Calibration of the thermometer and monitoring of ENSO
Publisher: American Geophysical Union (AGU)
Date: 06-1997
DOI: 10.1029/97PA00318
Isotopic and geochemical studies of nodules in kimberlite have implications for the lower continental crust
Publisher: Springer Science and Business Media LLC
Date: 11-1982
DOI: 10.1038/300166A0
GEOCHEMISTRY OF PLIOCENE TO QUATERNARY ALKALI BASALTS FROM THE HURI HILLS, NORTHERN KENYA
Publisher: Elsevier BV
Date: 03-1994
Ancient seafloor signals in Pitcairn Island lavas and evidence for large amplitude, small length-scale mantle heterogeneities
Publisher: Elsevier BV
Date: 09-1989
Origin and Migration of the Alpine Iceman
Publisher: American Association for the Advancement of Science (AAAS)
Date: 31-10-2003
Abstract: The Alpine Iceman provides a unique window into the Neolithic-Copper Age of Europe. We compared the radiogenic (strontium and lead) and stable (oxygen and carbon) isotope composition of the Iceman's teeth and bones, as well as 40 Ar/ 39 Ar mica ages from his intestine, to local geology and hydrology, and we inferred his habitat and range from childhood to adult life. The Iceman's origin can be restricted to a few valleys within ∼60 kilometers south(east) of the discovery site. His migration during adulthood is indicated by contrasting isotopic compositions of enamel, bones, and intestinal content. This demonstrates that the Alpine valleys of central Europe were permanently inhabited during the terminal Neolithic.
Quantifying the pH ‘vital effect’ in the temperate zooxanthellate coral Cladocora caespitosa: Validation of the boron seawater pH proxy
Publisher: Elsevier BV
Date: 03-2011
Biological mechanisms supporting adaptation to ocean acidification in coastal ecosystems
Publisher: Elsevier BV
Date: 2015
Porites corals as recorders of mining and environmental impacts: Misima Island, Papua New Guinea
Publisher: Elsevier BV
Date: 2002
A LOWER CRUSTAL ORIGIN FOR MASSIF-TYPE ANORTHOSITES
Publisher: Springer Science and Business Media LLC
Date: 09-1984
DOI: 10.1038/311372A0
Coral record of southeast Indian Ocean marine heatwaves with intensified Western Pacific temperature gradient
Publisher: Springer Science and Business Media LLC
Date: 23-10-2015
DOI: 10.1038/NCOMMS9562
Abstract: Increasing intensity of marine heatwaves has caused widespread mass coral bleaching events, threatening the integrity and functional ersity of coral reefs. Here we demonstrate the role of inter-ocean coupling in lifying thermal stress on reefs in the poorly studied southeast Indian Ocean (SEIO), through a robust 215-year (1795–2010) geochemical coral proxy sea surface temperature (SST) record. We show that marine heatwaves affecting the SEIO are linked to the behaviour of the Western Pacific Warm Pool on decadal to centennial timescales, and are most pronounced when an anomalously strong zonal SST gradient between the western and central Pacific co-occurs with strong La Niña's. This SST gradient forces large-scale changes in heat flux that exacerbate SEIO heatwaves. Better understanding of the zonal SST gradient in the Western Pacific is expected to improve projections of the frequency of extreme SEIO heatwaves and their ecological impacts on the important coral reef ecosystems off Western Australia.
Nd isotopic evidence for transient, highly depleted mantle reservoirs in the early history of the Earth
Publisher: Elsevier BV
Date: 09-1993
Effects of sedimentary sorting on neodymium isotopes in deep-sea turbidites
Publisher: Springer Science and Business Media LLC
Date: 02-1989
DOI: 10.1038/337547A0
GEOCHEMICAL AND GEODYNAMICAL CONSTRAINTS ON SUBDUCTION ZONE MAGMATISM
Publisher: Elsevier BV
Date: 03-1991
Coral calcifying fluid pH dictates response to ocean acidification
Publisher: Springer Science and Business Media LLC
Date: 06-06-2014
DOI: 10.1038/SREP05207
Evolution of the early Earth: Constraints from 143Nd142Nd isotopic systematics
Publisher: Elsevier BV
Date: 09-1993
High-precision U-series dating of corals from Western Australia and implications for the timing and duration of the Last Interglacial
Publisher: Elsevier BV
Date: 10-1995
Multi-trace element sea surface temperature coral reconstruction for the southern Mozambique Channel reveals teleconnections with the tropical Atlantic
Publisher: Copernicus GmbH
Date: 16-10-2018
DOI: 10.5194/BG-2018-441
Abstract: Abstract. Here we report seasonally resolved sea surface temperatures for the southern Mozambique Channel in the SW Indian Ocean based on multi-trace element temperatures proxy records preserved in two Porites sp. coral cores. Particularly, we assess the suitability of both separate and combined Sr / Ca and Li / Mg proxies for improved multi-element SST reconstructions. Overall geochemical records from Europa Island Porites sp. highlight the potential of Sr / Ca and Li / Mg ratios as high-resolution climate archives but also show significant differences in their response at this Indian Ocean tropical reef site. Our reconstruction from 1970 to 2013 using the Sr / Ca-SST proxy reveals a warming trend of 0.58 ± 0.1 °C in in close agreement with instrumental data (0.47 ± 0.07 °C) over the last 42 years (1970 to 2013). In contrast the Li / Mg showed unrealistically large warming trends, most probably caused by uncertainties around different uptake mechanisms of trace elements Li and Mg and uncertainties in their temperature calibration. However, spatial correlations between the combined detrended Sr / Ca, and Li / Mg proxies compared to instrumental SST at Europa revealed robust correlations with local climate variability in the Mozambique Channel and teleconnections to regions in the Indian Ocean and southeastern Pacific where surface wind variability appeared to dominate the underlying pattern of SST variability. The strongest correlation was found between our Europa SST reconstruction and instrumental SST records from the northern tropical Atlantic SST. Only a weak correlation was found with ENSO, with recent warm anomalies in the geochemical proxies coinciding with strong El Niño or La Niña. We identified the Pacific/North American (PNA) atmospheric pattern, which develops in the Pacific in response to ENSO, and the tropical North Atlantic SST as the most likely causes of the observed teleconnections with the Mozambique Channel SST at Europa.
AGE AND ORIGIN OF A COMPOSITIONALLY VARIED MAFIC DYKE SWARM IN THE BUNGER HILLS, EAST ANTARCTICA
Publisher: Elsevier BV
Date: 07-1990
Nd and Sr isotopes in kimberlites and lamproites from Western Australia: An enriched mantle origin
Publisher: Springer Science and Business Media LLC
Date: 03-1983
DOI: 10.1038/302400A0
Contrasting zircon u-pb and model sm-nd ages for the archaean logue Brook Granite
Publisher: Informa UK Limited
Date: 06-1986
Pb-Nd-Sr isotopic compositions and trace element characteristics of young volcanic rocks from Egmont Volcano and comparisons with basalts and andesites from the Taupo Volcanic Zone, New Zealand
Publisher: Elsevier BV
Date: 03-1992
PH homeostasis during coral calcification in a free ocean CO2 enrichment (FOCE) experiment, Heron Island reef flat, Great Barrier Reef
Publisher: Proceedings of the National Academy of Sciences
Date: 05-10-2015
Abstract: In situ free ocean CO 2 enrichment (FOCE) experiments and geochemical analyses (δ 11 B, Sr/Ca) conducted on corals ( Porites cylindrica ) from the highly dynamic Heron Island reef flat of the Great Barrier Reef show that this species exerts strong physiological controls on the pH of their calcifying fluid (pH cf ). Over an ∼6-mo period, from mid-winter to early summer, we show that these corals maintained their pH cf at near constant elevated levels independent of the highly variable temperatures and FOCE-controlled carbonate chemistries to which they were exposed, implying they have a high degree of tolerance to ocean acidification.
Impact of matrix effects on the accurate measurement of Li isotope ratios by inductively coupled plasma mass spectrometry (MC-ICP-MS) under “cold” plasma conditions
Publisher: Royal Society of Chemistry (RSC)
Date: 2003
DOI: 10.1039/B212083F
ROUTINE LEAD-ISOTOPE DETERMINATIONS USING A PB-207 PB-204 DOUBLE SPIKE - A LONG-TERM ASSESSMENT OF ANALYTICAL PRECISION AND ACCURACY
Publisher: Royal Society of Chemistry (RSC)
Date: 1995
DOI: 10.1039/AN9952000035
Characterisation of a plume-related ∼ 800 Ma magmatic event and its implications for basin formation in central-southern Australia
Publisher: Elsevier BV
Date: 02-1994
Corals record long-term Leeuwin current variability including Ningaloo Niño/Niña since 1795
Publisher: Springer Science and Business Media LLC
Date: 04-2014
DOI: 10.1038/NCOMMS4607
Lead isotopic evidence for deep crustal-scale fluid transport during granite petrogenesis
Publisher: Elsevier BV
Date: 02-1993
The coral record of last interglacial sea levels and sea surface temperatures
Publisher: Elsevier BV
Date: 08-2000
Reviews and syntheses: Revisiting the boron systematics of aragonite and their application to coral calcification
Publisher: Copernicus GmbH
Date: 12-02-2018
DOI: 10.5194/BG-2018-77
Abstract: Abstract. The isotopic and elemental systematics of boron in aragonitic coral skeletons have recently been developed as a proxy for the carbonate chemistry of the coral extracellular calcifying fluid. With knowledge of the boron isotopic fractionation in seawater and the B / Ca partition coefficient (KD) between aragonite and seawater, measurements of coral skeleton δ11B and B / Ca can potentially constrain the full carbonate system. Two sets of abiogenic aragonite precipitation experiments designed to quantify KD have recently made possible the application of this proxy system. However, while different KD formulations have been proposed, there has not yet been a comprehensive analysis that considers both experimental datasets and explores the implications for interpreting coral skeletons. Here, we evaluate four potential KD formulations: three previously presented in the literature and one newly developed. We assess how well each formulation reconstructs the known fluid carbonate chemistry from the abiogenic experiments, and we evaluate the implications for deriving the carbonate chemistry of coral calcifying fluid. Three of the KD formulations performed similarly when applied to abiogenic aragonites precipitated from seawater and to coral skeletons. Critically, we find that some uncertainty remains in understanding the mechanism of boron elemental partitioning between aragonite and seawater, and addressing this question should be a target of additional abiogenic precipitation experiments. Despite this, boron systematics can already be applied to quantify the coral calcifying fluid carbonate system, although uncertainties associated with the proxy system should be carefully considered for each application. Finally, we present a user-friendly computer code that calculates coral calcifying fluid carbonate chemistry, including propagation of uncertainties, given inputs of boron systematics measured in coral skeleton.
Unveiling deep-sea habitats of the Southern Ocean-facing submarine canyons of southwestern Australia
Publisher: Elsevier BV
Date: 12-2022
U-series dating of carbonates using inductively coupled plasma-quadrupole mass spectrometry
Publisher: Elsevier BV
Date: 12-2011
Timing and duration of the Last Interglacial: evidence for a restricted interval of widespread coral reef growth
Publisher: Elsevier BV
Date: 08-1998
Terrestrial Signature in Coral Ba/Ca, δ18O, and δ13C Records From a Macrotide-Dominated Nearshore Reef Environment, Kimberley Region of Northwestern Australia
Publisher: American Geophysical Union (AGU)
Date: 26-02-2020
DOI: 10.1029/2019JG005394
Stable isotopes (δ18O and δ13C), trace and minor element compositions of Recent scleractinians and Last Glacial bivalves at the Santa Maria di Leuca deep-water coral province, Ionian Sea
Publisher: Elsevier BV
Date: 03-2010
Li/Mg systematics in scleractinian corals: Calibration of the thermometer
Publisher: Elsevier BV
Date: 05-2014
Geochemical and isotopic variations in the calc-alkaline rocks of Aeolian arc, southern Tyrrhenian Sea, Italy: constraints on magma genesis
Publisher: Springer Science and Business Media LLC
Date: 03-1993
DOI: 10.1007/BF00286923
Evaluating Quaternary dating methods: Radiocarbon, U-series, luminescence, and amino acid racemization dates of a late Pleistocene emu egg
Publisher: Elsevier BV
Date: 04-2009
ND AND SR ISOTOPIC SYSTEMATICS OF CENTRAL AUSTRALIAN GRANULITES - CHRONOLOGY OF CRUSTAL DEVELOPMENT AND CONSTRAINTS ON THE EVOLUTION OF LOWER CONTINENTAL-CRUST
Publisher: Springer Science and Business Media LLC
Date: 11-1986
DOI: 10.1007/BF00371438
Geochemistry of loess, continental crustal composition and crustal model ages
Publisher: Elsevier BV
Date: 11-1983
River runoff reconstructions from novel spectral luminescence scanning of massive coral skeletons
Publisher: Springer Science and Business Media LLC
Date: 15-05-2010
Further Hf isotope evidence for Hadean continental crust
Publisher: Elsevier BV
Date: 08-2006
Aeolian contribution to strontium and strontium isotope variations in a Tasmanian speleothem
Publisher: Elsevier BV
Date: 07-1998
Coral Li/Mg thermometry: Caveats and constraints
Publisher: Elsevier BV
Date: 09-2019
Coral Ba/Ca records of sediment input to the fringing reef of the southshore of Moloka'i, Hawai'i over the last several decades
Publisher: Elsevier BV
Date: 10-2010
DOI: 10.1016/J.MARPOLBUL.2010.05.024
Abstract: The fringing reef of southern Moloka'i is perceived to be in decline because of land-based pollution. In the absence of historical records of sediment pollution, ratios of coral Ba/Ca were used to test the hypothesis that sedimentation has increased over time. Baseline Ba/Ca ratios co-vary with the abundance of red, terrigenous sediment visible in recent imagery. The highest values at One Ali'i are near one of the muddiest parts of the reef. This co-varies with the lowest growth rate of all the sites, perhaps because the upstream Kawela watershed was historically leveed all the way to the nearshore, providing a fast-path for sediment delivery. Sites adjacent to small, steep watersheds have ∼decadal periodicities whereas sites adjacent to mangrove forests have shorter-period fluctuations that correspond to the periodicity of sediment transport in the nearshore, rather than the watershed. All four sites show a statistically significant upward trend in Ba/Ca.
CHEMICAL GEODYNAMICS IN A BACK ARC REGION AROUND THE SEA OF JAPAN - IMPLICATIONS FOR THE GENESIS OF ALKALINE BASALTS IN JAPAN, KOREA, AND CHINA
Publisher: American Geophysical Union (AGU)
Date: 10-04-1989
Coral record of increased sediment flux to the inner Great Barrier Reef since European settlement
Publisher: Springer Science and Business Media LLC
Date: 02-2003
DOI: 10.1038/NATURE01361
Precise determination of Sm Nd ratios, Sm and Nd isotopic abundances in standard solutions
Publisher: Elsevier BV
Date: 12-1981
Stress-resistant corals may not acclimatize to ocean warming but maintain heat tolerance under cooler temperatures
Publisher: Springer Science and Business Media LLC
Date: 17-09-2019
DOI: 10.1038/S41467-019-12065-0
Abstract: Naturally heat-resistant coral populations hold significant potential for facilitating coral reef survival under rapid climate change. However, it remains poorly understood whether they can acclimatize to ocean warming when superimposed on their already thermally-extreme habitats. Furthermore, it is unknown whether they can maintain their heat tolerance upon larval dispersal or translocation to cooler reefs. We test this in a long-term mesocosm experiment using stress-resistant corals from thermally-extreme reefs in NW Australia. We show that these corals have a remarkable ability to maintain their heat tolerance and health despite acclimation to 3–6 °C cooler, more stable temperatures over 9 months. However, they are unable to increase their bleaching thresholds after 6-months acclimation to + 1 °C warming. This apparent rigidity in the thermal thresholds of even stress-resistant corals highlights the increasing vulnerability of corals to ocean warming, but provides a rationale for human-assisted migration to restore cooler, degraded reefs with corals from thermally-extreme reefs.
Geochemical and Sr-Nd isotopic study of charnockites and related rocks in the northern Prince Charles Mountains, east Antarctica: Implications for charnockite petrogenesis and Proterozoic crustal evolution
Publisher: Elsevier BV
Date: 1997
ND-SR ISOTOPIC AND GEOCHEMICAL SYSTEMATICS IN CAMBRIAN BONINITES AND THOLEIITES FROM VICTORIA, AUSTRALIA
Publisher: Springer Science and Business Media LLC
Date: 11-1984
DOI: 10.1007/BF00371420
Limits to the thermal tolerance of corals adapted to a highly fluctuating, naturally extreme temperature environment
Publisher: Springer Science and Business Media LLC
Date: 02-12-2015
DOI: 10.1038/SREP17639
Abstract: Naturally extreme temperature environments can provide important insights into the processes underlying coral thermal tolerance. We determined the bleaching resistance of Acropora aspera and Dipsastraea sp. from both intertidal and subtidal environments of the naturally extreme Kimberley region in northwest Australia. Here tides of up to 10 m can cause aerial exposure of corals and temperatures as high as 37 °C that fluctuate daily by up to 7 °C. Control corals were maintained at ambient nearshore temperatures which varied diurnally by 4-5 °C, while treatment corals were exposed to similar diurnal variations and heat stress corresponding to ~20 degree heating days. All corals hosted Symbiodinium clade C independent of treatment or origin. Detailed physiological measurements showed that these corals were nevertheless highly sensitive to daily average temperatures exceeding their maximum monthly mean of ~31 °C by 1 °C for only a few days. Generally, Acropora was much more susceptible to bleaching than Dipsastraea and experienced up to 75% mortality, whereas all Dipsastraea survived. Furthermore, subtidal corals, which originated from a more thermally stable environment compared to intertidal corals, were more susceptible to bleaching. This demonstrates that while highly fluctuating temperatures enhance coral resilience to thermal stress, they do not provide immunity to extreme heat stress events.
An ancient Sm-Nd age for a ferroan noritic anorthosite clast from lunar breccia 67016
Publisher: Elsevier BV
Date: 07-1994
The big ecological questions inhibiting effective environmental management in Australia
Publisher: Wiley
Date: 12-01-2009
Evidence of El Niño and the Indian Ocean Dipole from Sr/Ca derived SSTs for modern corals at Christmas Island, Eastern Indian Ocean
Publisher: American Geophysical Union (AGU)
Date: 15-09-2001
DOI: 10.1029/2001GL012978
ND-PB ISOTOPIC CHARACTERISTICS OF THE MORDOR COMPLEX, NORTHERN-TERRITORY - MID-PROTEROZOIC POTASSIC MAGMATISM FROM AN ENRICHED MANTLE SOURCE
Publisher: Informa UK Limited
Date: 12-1989
A High-Resolution Coral-Based Δ14C Record of Surface Water Processes in the Western Mediterranean Sea
Publisher: Cambridge University Press (CUP)
Date: 2013
The New England Batholith: constraints on its derivation from Nd and Sr isotopic studies of granitoids and country rocks
Publisher: Elsevier BV
Date: 02-1985
Corals record low mobile barium concentrations in the Burdekin River during the 1974 flood: Evidence for limited Ba supply to rivers?
Publisher: Elsevier BV
Date: 04-11-2004
Phosphorus in Cold-Water Corals as a Proxy for Seawater Nutrient Chemistry
Publisher: American Association for the Advancement of Science (AAAS)
Date: 23-06-2006
Abstract: Phosphorus is a key macronutrient being strongly enriched in the deep ocean as a result of continuous export and remineralization of biomass from primary production. We show that phosphorus incorporated within the skeletons of the cosmopolitan cold-water coral Desmophyllum dianthus is directly proportional to the ambient seawater phosphorus concentration and thus may serve as a paleo-oceanographic proxy for variations in ocean productivity as well as changes in the residence times and sources of deep-water masses. The application of this tool to fossil specimens from the Mediterranean reveals phosphorus-enriched bottom waters at the end of the Younger Dryas period.
A Detailed 31,000-Year Record of Climate and Vegetation Change, from the Isotope Geochemistry of Two New Zealand Speleothems
Publisher: Cambridge University Press (CUP)
Date: 09-1998
Abstract: Uranium-series dating and stable isotope analyses of two speleothems from northwest Nelson, New Zealand, record changes in regional climate and local forest extent over the past 31,000 years. Oxygen isotope variation in these speleothems primarily represents changes in the meteoric waters falling above the caves, possibly responding to latitudinal changes in the position of the Subtropical Front in the Tasman Sea. Seven positive excursions can be identified in the oxygen isotope record, which coincide with periods of glacier advance, known to be sensitive to northward movement of the Subtropical Front. Four glacier advances occurred during oxygen isotope stage 2, with the most extreme glacial conditions centered on 19,000 cal yr B.P. An excursion in the oxygen isotope record from 13,800 to 11,700 cal yr B.P. provides support for a previously identified New Zealand glacier advance at the time of the Younger Dryas Stade, but suggests it began slightly before the Younger Dryas as recorded in Greenland ice cores. Carbon isotope variations in the speleothems record changes in forest productivity, closely matching existing paleovegetation records. On the basis of vegetation changes, stage 2 glacial climate conditions terminated abruptly in central New Zealand, from 15,700 to 14,200 cal yr B.P. Evidence of continuous speleothem growth at one site suggests that depression of the local treeline was limited to 600–700 m below its present altitude, throughout the last 31,000 years.
Interactive effects of ontogeny, food ration and temperature on elemental incorporation in otoliths of a coral reef fish
Publisher: Springer Science and Business Media LLC
Date: 29-05-2010
Sm-Nd and U-Pb zircon isotopic constraints on the provenance of sediments from the Amadeus Basin, central Australia: Evidence for REE fractionation
Publisher: Elsevier BV
Date: 03-1992
Cleaning and pre-treatment procedures for biogenic and synthetic calcium carbonate powders for determination of elemental and boron isotopic compositions
Publisher: Elsevier BV
Date: 03-2015
Proterozoic crustal growth: Underplating and magmatism
Publisher: Elsevier BV
Date: 08-1988
Sr and Nd isotope systematics of polymetamorphic Archean gneisses from southern West Greenland and northern Labrador
Publisher: Canadian Science Publishing
Date: 03-1989
DOI: 10.1139/E89-039
Abstract: Sr and Nd isotopic data for middle to late Archean polymetamorphic felsic gneisses from localities in the Nuuk area, West Greenland, are compared and contrasted with new isotopic results for early Archean Amîtsoq gneisses and with data for isotopically reworked Kiyuktok gneisses from the Saglek area, Labrador. Sr isotopic data for in idual suites of felsic gneisses record the time-integrated effect of variable Rb–Sr fractionation during prograde and retrograde events as well as the effect of source inhomogeneity.Contrasting petrologic and Sr–Nd isotopic characteristics are the result of differences in level of exposure, caused partially by juxtaposition of terranes of different metamorphic character by movement on ductile shear zones and post-shearing folding deformation. Sm–Nd systematics of felsic gneisses from Nordafar, Ikerasakitsup akornga, Tinissaq, and Kangimut sammisoq – Qasigianguit define a geologically meaningless ca. 3280 Ma Nd "isochron", which is the result of mixing of s les from unrelated suites and the effect of open-system behaviour. Gneisses lying on this pseudoisochron were variably affected by ca. 2800–2900 Ma prograde granulite-facies metamorphism and structurally controlled retrogression under hibolite- to greenschist-facies conditions.The study shows that Sr–Nd isotope systematics of geologically identifiable units may be modified by open-system behaviour during prograde and retrograde metamorphism. Isotopic data from gneiss complexes metamorphosed under granulite-facies conditions may therefore yield equivocal information concerning isochron interpretation, significance of model ages, and estimates of crustal residence time.
Lower crustal xenoliths from Queensland, Australia: Evidence for deep crustal assimilation and fractionation of continental basalts
Publisher: Elsevier BV
Date: 06-1986
Plume versus lithospheric sources for melts at Ua Pou, Marquesas Islands
Publisher: Springer Science and Business Media LLC
Date: 08-1986
DOI: 10.1038/322534A0
Geomorphic evidence of major sea-level fluctuations during marine isotope substage-5e, Cape Cuvier, Western Australia
Publisher: Elsevier BV
Date: 12-2008
Effect of ocean warming and acidification on the early life stages of subtropical Acropora spicifera
Publisher: Springer Science and Business Media LLC
Date: 03-09-2015
A three-component Sr-Nd isotopic mixing model for granitoid genesis, Lachlan fold belt, eastern Australia
Publisher: Geological Society of America
Date: 1997
EVIDENCE FOR ISOTOPIC EQUILIBRATION OF SM-ND WHOLE-ROCK SYSTEMS IN EARLY ARCHEAN CRUST OF ENDERBY LAND, ANTARCTICA
Publisher: Elsevier BV
Date: 03-1987
Variability in the El Niño-Southern Oscillation through a glacial-interglacial cycle
Publisher: American Association for the Advancement of Science (AAAS)
Date: 23-02-2001
Abstract: The El Niño–Southern Oscillation (ENSO) is the most potent source of interannual climate variability. Uncertainty surrounding the impact of greenhouse warming on ENSO strength and frequency has stimulated efforts to develop a better understanding of the sensitivity of ENSO to climate change. Here we use annually banded corals from Papua New Guinea to show that ENSO has existed for the past 130,000 years, operating even during “glacial” times of substantially reduced regional and global temperature and changed solar forcing. However, we also find that during the 20th century ENSO has been strong compared with ENSO of previous cool (glacial) and warm (interglacial) times. The observed pattern of change in litude may be due to the combined effects of ENSO d ening during cool glacial conditions and ENSO forcing by precessional orbital variations.
ND ISOTOPIC CHARACTERISTICS OF S-TYPE AND I-TYPE GRANITES
Publisher: Elsevier BV
Date: 03-1982
THE ND-ISOTOPIC AND SR-ISOTOPIC COMPOSITION OF I-TYPE MICROGRANITOID ENCLAVES AND THEIR HOST ROCKS FROM THE SWIFTS CREEK PLUTON, SOUTHEAST AUSTRALIA
Publisher: Elsevier BV
Date: 07-1990
Proliferation and demise of deep-sea corals in the Mediterranean during the Younger Dryas
Publisher: Elsevier BV
Date: 09-2010
Early Archean crustal evolution of the Jack Hills Zircon source terrane inferred from Lu–Hf, 207Pb/206Pb, and δ18O systematics of Jack Hills zircons
Publisher: Elsevier BV
Date: 09-2011
Intensified mid-Holocene Asian monsoon recorded in corals from Kikai Island, subtropical northwestern Pacific
Publisher: Cambridge University Press (CUP)
Date: 03-2007
DOI: 10.1016/J.YQRES.2006.12.005
Abstract: Coupled records of Sr/Ca and oxygen isotope ratios (δ 18 O) of coral skeletons have been used to produce quantitative estimates of paleo-sea surface temperature (SST) and δ 18 O of surface seawater that can in some cases be converted to sea surface salinity (SSS). Two fossil corals from Kikai Island in the subtropical northwestern Pacific, a location affected by East Asian summer and winter monsoons, were analyzed to investigate differences between mid-Holocene and present-day SST and SSS. At 6180 cal yr BP, SSTs were roughly the same as today, both in summer and winter δ 18 O seawater and SSS values were higher both in summer (+ 0.5‰, +1.1 psu) and in winter (+ 0.2‰, + 0.6 psu) than modern values. At 7010 cal yr BP, SSTs were slightly cooler both in summer and winter (−0.8 and −0.6 °C), whereas δ 18 O seawater and SSS had higher values in summer (+ 0.3‰, + 0.6 psu) and in winter (+ 0.8‰, + 1.9 psu) than present-day values. These results are consistent with other marine records for the mid-Holocene of the low and midlatitudes in the northwestern Pacific. Such regional conditions indicate that the East Asian summer and winter monsoons were more intense in the mid-Holocene, which was likely a function of the mid-Holocene insolation regime.
Isotopic evidence for the dependence of recurrent felsic magmatism on new crust formation: An example from the Georgetown region of Northeastern Australia
Publisher: Elsevier BV
Date: 1990
Assessing the drivers of spatial variation in thermal forcing across a nearshore reef system and implications for coral bleaching
Publisher: Wiley
Date: 20-06-2014
Neodymium isotope evidence for ultra-depleted mantle in the early Proterozoic
Publisher: Springer Science and Business Media LLC
Date: 12-1991
DOI: 10.1038/354384A0
δ34S character of organosulfur compounds in kerogen and bitumen fractions of sedimentary rocks
Publisher: Elsevier BV
Date: 08-2017
Radiocarbon-based ages and growth rates of bamboo corals from the Gulf of Alaska
Publisher: American Geophysical Union (AGU)
Date: 02-2005
DOI: 10.1029/2004GL021919
Regional geochemical and isotopic characteristics of high-grade metamorphics of the Prydz bay area: The extent of proterozoic reworking of Qrchaean continental crust in East Antarctica
Publisher: Elsevier BV
Date: 11-1984
Coral Records of Variable Stress Impacts and Possible Acclimatization to Recent Marine Heat Wave Events on the Northwest Shelf of Australia
Publisher: American Geophysical Union (AGU)
Date: 11-2019
DOI: 10.1029/2018PA003509
SM-ND ISOTOPE SYSTEMATICS IN URANIUM RARE EARTH ELEMENT MINERALIZATION AT THE MARY-KATHLEEN-URANIUM-MINE, QUEENSLAND
Publisher: Society of Economic Geologists
Date: 11-1987
Coral resilience to ocean acidification and global warming through pH up-regulation
Publisher: Springer Science and Business Media LLC
Date: 04-2012
DOI: 10.1038/NCLIMATE1473
Sm-Nd age of Kambalda and Kanowna greenstones and heterogeneity in the Archaean mantle
Publisher: Springer Science and Business Media LLC
Date: 11-1981
DOI: 10.1038/294322A0
Small Amounts of Zinc from Zinc Oxide Particles in Sunscreens Applied Outdoors Are Absorbed through Human Skin
Publisher: Oxford University Press (OUP)
Date: 04-2010
Examining water temperature proxies in Porites corals from the Great Barrier Reef: a cross-shelf comparison
Publisher: Springer Science and Business Media LLC
Date: 12-2003
Differential response of corals to regional mass-warming events as evident from skeletal Sr/Ca and Mg/Ca ratios
Publisher: American Geophysical Union (AGU)
Date: 05-2017
DOI: 10.1002/2016GC006788
Ocean acidification causes structural deformities in juvenile coral skeletons
Publisher: American Association for the Advancement of Science (AAAS)
Date: 05-02-2016
Abstract: 3D imaging exposes deformities and shows how ocean acidification can change the way juvenile corals build their skeletons.
An assessment of the Sr/Ca ratio in shallow water hermatypic corals as a proxy for sea surface temperature
Publisher: Elsevier BV
Date: 09-2002
The origins of ultrapotassic rocks as inferred from Sr, Nd and Pb isotopes
Publisher: Elsevier BV
Date: 02-1986
Interpreting environmental signals from the coralline sponge Astrosclera willeyana
Publisher: Elsevier BV
Date: 11-2005
Accurate in situ238U-234U-232Th- 230Th analysis of silicate glasses and iron oxides by laser-ablation MC-ICP-MS
Publisher: Royal Society of Chemistry (RSC)
Date: 2005
DOI: 10.1039/B505020K
Supplementary material to "Reviews and syntheses: Revisiting the boron systematics of aragonite and their application to coral calcification"
Publisher: Copernicus GmbH
Date: 12-02-2018
Global sea-level fluctuations during the Last Interglaciation (MIS 5e)
Publisher: Elsevier BV
Date: 09-2007
Direct determination of boron and chlorine isotopic compositions in geological materials by negative thermal-ionization mass spectrometry
Publisher: Elsevier BV
Date: 09-1989
Impact of skeletal dissolution and secondary aragonite on trace element and isotopic climate proxies inPoritescorals
Publisher: American Geophysical Union (AGU)
Date: 05-10-2007
DOI: 10.1029/2007PA001462
Pb-Sr-Nd-O isotopic constraints on the origin of rhyolites from the Taupo Volcanic Zone of New Zealand: evidence for assimilation followed by fractionation from basalt
Publisher: Springer Science and Business Media LLC
Date: 1994
DOI: 10.1007/BF00310769
Secular variation in the Nd isotopic composition of Neoproterozoic sediments from the southern margin of the Yangtze Block: Evidence for a proterozoic continental collision in southeast China
Publisher: Elsevier BV
Date: 1996
Spatial and temporal patterns of mass bleaching of corals in the Anthropocene
Publisher: American Association for the Advancement of Science (AAAS)
Date: 05-01-2018
Abstract: Coral bleaching occurs when stressful conditions result in the expulsion of the algal partner from the coral. Before anthropogenic climate warming, such events were relatively rare, allowing for recovery of the reef between events. Hughes et al. looked at 100 reefs globally and found that the average interval between bleaching events is now less than half what it was before. Such narrow recovery windows do not allow for full recovery. Furthermore, warming events such as El Niño are warmer than previously, as are general ocean conditions. Such changes are likely to make it more and more difficult for reefs to recover between stressful events. Science , this issue p. 80
Seasonal characteristics of the Indian Ocean Dipole during the Holocene epoch
Publisher: Springer Science and Business Media LLC
Date: 2007
DOI: 10.1038/NATURE05477
Abstract: The Indian Ocean Dipole (IOD)--an oscillatory mode of coupled ocean-atmosphere variability--causes climatic extremes and socio-economic hardship throughout the tropical Indian Ocean region. There is much debate about how the IOD interacts with the El Niño/Southern Oscillation (ENSO) and the Asian monsoon, and recent changes in the historic ENSO-monsoon relationship raise the possibility that the properties of the IOD may also be evolving. Improving our understanding of IOD events and their climatic impacts thus requires the development of records defining IOD activity in different climatic settings, including prehistoric times when ENSO and the Asian monsoon behaved differently from the present day. Here we use coral geochemical records from the equatorial eastern Indian Ocean to reconstruct surface-ocean cooling and drought during in idual IOD events over the past approximately 6,500 years. We find that IOD events during the middle Holocene were characterized by a longer duration of strong surface ocean cooling, together with droughts that peaked later than those expected by El Niño forcing alone. Climate model simulations suggest that this enhanced cooling and drying was the result of strong cross-equatorial winds driven by the strengthened Asian monsoon of the middle Holocene. These IOD-monsoon connections imply that the socioeconomic impacts of projected future changes in Asian monsoon strength may extend throughout Australasia.
Madagascar corals reveal Pacific multidecadal modulation of rainfall since 1708
Publisher: Copernicus GmbH
Date: 12-03-2012
Abstract: Abstract. The Pacific Ocean modulates Australian and North American rainfall variability on multidecadal timescales, in concert with the Pacific Decadal Oscillation (PDO). It has been suggested that Pacific decadal variability may also influence Indian Ocean surface temperature and rainfall in a far-field response, similar to the El Niño Southern Oscillation (ENSO) on interannual timescales. However, instrumental records of rainfall are too short and too sparse to confidently assess such multidecadal climatic teleconnections. Here, we present four climate archives spanning the past 300 yr from giant Madagascar corals. We decouple 20th century human deforestation effects from rainfall induced soil erosion using spectral luminescence scanning and geochemistry. The corals provide the first evidence for Pacific decadal modulation of rainfall over the Western Indian Ocean. We find that positive PDO phases are associated with increased Indian Ocean temperatures and rainfall in Eastern Madagascar, while precipitation in Southern Africa and Eastern Australia declines. Consequently, the negative PDO phase that started in 1998 should lead to reduced rainfall over Eastern Madagascar and increased precipitation in Southern Africa and Eastern Australia. We conclude that the PDO has important implications for future multidecadal variability of African rainfall, where water resource management is increasingly important under the warming climate.
Supplementary material to "Unveiling the Perth Canyon and its deep-water faunas"
Publisher: Copernicus GmbH
Date: 02-08-2018
The southeast Australian lithospheric mantle: isotopic and geochemical constraints on its growth and evolution
Publisher: Elsevier BV
Date: 12-1987
Madagascar corals reveal a multidecadal signature of rainfall and river runoff since 1708
Publisher: Copernicus GmbH
Date: 13-03-2013
Abstract: Abstract. Pacific Ocean sea surface temperatures (SST) influence rainfall variability on multidecadal and interdecadal timescales in concert with the Pacific Decadal Oscillation (PDO) and Interdecadal Pacific Oscillation (IPO). Rainfall variations in locations such as Australia and North America are therefore linked to phase changes in the PDO. Furthermore, studies have suggested teleconnections exist between the western Indian Ocean and Pacific Decadal Variability (PDV), similar to those observed on interannual timescales related to the El Niño Southern Oscillation (ENSO). However, as instrumental records of rainfall are too short and sparse to confidently assess multidecadal climatic teleconnections, here we present four coral climate archives from Madagascar spanning up to the past 300 yr (1708–2008) to assess such decadal variability. Using spectral luminescence scanning to reconstruct past changes in river runoff, we identify significant multidecadal and interdecadal frequencies in the coral records, which before 1900 are coherent with Asian-based PDO reconstructions. This multidecadal relationship with the Asian-based PDO reconstructions points to an unidentified teleconnection mechanism that affects Madagascar rainfall/runoff, most likely triggered by multidecadal changes in North Pacific SST, influencing the Asian Monsoon circulation. In the 20th century we decouple human deforestation effects from rainfall-induced soil erosion by pairing luminescence with coral geochemistry. Positive PDO phases are associated with increased Indian Ocean temperatures and runoff/rainfall in eastern Madagascar, while precipitation in southern Africa and eastern Australia declines. Consequently, the negative PDO phase that started in 1998 may contribute to reduced rainfall over eastern Madagascar and increased precipitation in southern Africa and eastern Australia. We conclude that multidecadal rainfall variability in Madagascar and the western Indian Ocean needs to be taken into account when considering water resource management under a future warming climate.
Tracing the provenance and recrystallization processes of the Earth's oldest detritus at Mt. Narryer and Jack Hills, Western Australia: An in situ Sm–Nd isotopic study of monazite
Publisher: Elsevier BV
Date: 08-2011
New U-Pb zircon ages from the Denman Glacier area, East Antarctica, and their significance for Gondwana reconstruction
Publisher: Cambridge University Press (CUP)
Date: 12-1992
DOI: 10.1017/S095410209200066X
Abstract: Two new U-Pb zircon ages from the area immediately west of Denman Glacier in Antarctica show that its geological history differs from that of the Obruchev Hills and Bunger Hills, to the east of the glacier. A crystallization age of 516.0 ± 1.5 Ma for syenite is by far the youngest primary age reported for this region, whereas tonalitic orthogneiss from Cape Charcot, the oldest known local rock, was derived by the high-grade metamorphism and deformation at 2889 ± 9 Ma of a 3003 ± 8 Ma igneous precursor. Both major populations of zircon in this rock lost Pb at 500–600 Ma. Although the Sm-Nd characteristics of the entire region resemble those of the Albany Mobile Belt of Western Australia, the Sm-Nd systematics of the felsic gneisses and plutonics are too old to allow direct correlation with the rocks of the Naturaliste Block (Western Australia), a potential key element for Gondwana reconstruction. However, the possibility exists that there is an indirect relationship between the Naturaliste Block and the region immediately west of Denman Glacier.
Crustose coralline algal growth, calcification and mortality following a marine heatwave in Western Australia
Publisher: Elsevier BV
Date: 09-2015
Biologically controlled Mo isotope fractionation in coral reef systems
Publisher: Elsevier BV
Date: 10-2019
The application of compound-specific sulfur isotopes to the oil–source rock correlation of Kurdistan petroleum
Publisher: Elsevier BV
Date: 03-2018
Resolution of the early life history of a reef fish using otolith chemistry
Publisher: Springer Science and Business Media LLC
Date: 02-03-2005
Decoupling between the response of coral calcifying fluid pH and calcification to ocean acidification
Publisher: Springer Science and Business Media LLC
Date: 08-08-2017
DOI: 10.1038/S41598-017-08003-Z
Abstract: Evaluating the factors responsible for differing species-specific sensitivities to declining seawater pH is central to understanding the mechanisms via which ocean acidification (OA) affects coral calcification. We report here the results of an experiment comparing the responses of the coral Acropora yongei and Pocillopora damicornis to differing pH levels (8.09, 7.81, and 7.63) over an 8-week period. Calcification of A . youngei was reduced by 35% at pH 7.63, while calcification of P . damicornis was unaffected. The pH in the calcifying fluid (pH cf ) was determined using δ 11 B systematics, and for both species pH cf declined slightly with seawater pH, with the decrease being more pronounced in P . damicornis . The dissolved inorganic carbon concentration at the site of calcification (DIC cf ) was estimated using geochemical proxies (B/Ca and δ 11 B) and found to be double that of seawater DIC, and increased in both species as seawater pH decreased. As a consequence, the decline of the saturation state at the site of calcification (Ω cf ) with OA was partially moderated by the DIC cf increase. These results highlight that while pH cf , DIC cf and Ω cf are important in the mineralization process, some corals are able to maintain their calcification rates despite shifts in their calcifying fluid carbonate chemistry.
Disappearance of Acropora from the Marquesas (French Polynesia) during the last deglacial period
Publisher: Springer Science and Business Media LLC
Date: 27-08-2011
Phasing and amplitude of sea-level and climate change during the penultimate interglacial
Publisher: Springer Science and Business Media LLC
Date: 06-04-2009
DOI: 10.1038/NGEO470
Interdecadal climate variability in the Coral Sea since 1708 A.D.
Publisher: Elsevier BV
Date: 05-2007
The influence of oceanic and lagoonal plume waters on otolith chemistry
Publisher: Canadian Science Publishing
Date: 06-2004
DOI: 10.1139/F04-036
Abstract: To determine how ocean and lagoonal plume waters from within the same reef were reflected in the chemical composition of otoliths, we conducted an experiment over three consecutive summers where conditions of temperature and food were held constant. Presettlement Pomacentrus coelestis were held in replicate tanks of the two water masses for 9 days. The sagittae were then analyzed at high spatial resolution (5 µm × 50 µm × 4 µm) using laser ablation inductively coupled plasma mass spectrometry. Ba/Ca and Sr/Ca varied between water masses and the rank of these elemental ratios changed among years. Although the reason for this change in rank is not known, likely mechanisms include upwelling and (or) the episodic appearance of phytoplankton blooms inside the lagoon. This is the first demonstration that the elemental signatures of otoliths can vary significantly over small spatial scales in reef systems in the absence of confounding factors, thus complicating studies attempting to discriminate reef-based stocks or elucidate natal origins using otolith chemistry.
Sm-Nd and Rb-Sr isotopic and geochemical systematics in Phanerozoic granulites from Fiordland, southwest New Zealand
Publisher: Springer Science and Business Media LLC
Date: 10-1987
DOI: 10.1007/BF00371238
Evaluation of annual resolution coral geochemical records as climate proxies in the Great Barrier Reef of Australia
Publisher: Springer Science and Business Media LLC
Date: 11-09-2014
Active modulation of the calcifying fluid carbonate chemistry (δ11B, B/Ca) and seasonally invariant coral calcification at sub-tropical limits
Publisher: Springer Science and Business Media LLC
Date: 23-10-2017
DOI: 10.1038/S41598-017-14066-9
Abstract: Coral calcification is dependent on both the supply of dissolved inorganic carbon (DIC) and the up-regulation of pH in the calcifying fluid (cf). Using geochemical proxies (δ 11 B, B/Ca, Sr/Ca, Li/Mg), we show seasonal changes in the pH cf and DIC cf for Acropora yongei and Pocillopora damicornis growing in-situ at Rottnest Island (32°S) in Western Australia. Changes in pH cf range from 8.38 in summer to 8.60 in winter, while DIC cf is 25 to 30% higher during summer compared to winter (×1.5 to ×2 seawater). Thus, both variables are up-regulated well above seawater values and are seasonally out of phase with one another. The net effect of this counter-cyclical behaviour between DIC cf and pH cf is that the aragonite saturation state of the calcifying fluid (Ω cf ) is elevated ~4 times above seawater values and is ~25 to 40% higher during winter compared to summer. Thus, these corals control the chemical composition of the calcifying fluid to help sustain near-constant year-round calcification rates, despite a seasonal seawater temperature range from just ~19° to 24 °C. The ability of corals to up-regulate Ω cf is a key mechanism to optimise biomineralization, and is thus critical for the future of coral calcification under high CO 2 conditions.
Magmatic evolution of Semisopochnoi Island, Alaska: trace-element and isotopic constraints.
Publisher: University of Chicago Press
Date: 09-1985
DOI: 10.1086/628985
Elemental signatures of Pomacentrus coelestis otoliths at multiple spatial scales on the Great Barrier Reef, Australia
Publisher: Inter-Research Science Center
Date: 2004
DOI: 10.3354/MEPS270229
The non-tropical coral Cladocora caespitosa as the new climate archive for the Mediterranean: high-resolution (∼weekly) trace element systematics
Publisher: Elsevier BV
Date: 02-2007
Reassessment of the origin of the Dun Mountain Ophiolite, New Zealand: Nd-isotopic and geochemical evolution of magma suites
Publisher: Informa UK Limited
Date: 06-2000
Boron isotope composition of the cold-water coral Lophelia pertusa along the Norwegian margin: Zooming into a potential pH-proxy by combining bulk and high-resolution approaches
Publisher: Elsevier BV
Date: 05-2019
Sr isotope constraints on the Mediterranean environment at the end of the Messinian salinity crisis
Publisher: Springer Science and Business Media LLC
Date: 11-1989
DOI: 10.1038/342062A0
Nd and Sr isotopic crustal contamination patterns in an Archaean meta-basic dyke from northern Labrador
Publisher: Elsevier BV
Date: 1984
The role of subducted slabs in an evolving Earth
Publisher: Elsevier BV
Date: 03-1993
Impacts of heat stress on the calcifying fluid chemistry and trace element composition of corals from thermally variable reefs
Publisher: Copernicus GmbH
Date: 23-03-2020
DOI: 10.5194/EGUSPHERE-EGU2020-19080
Abstract: & & Coral reefs are increasingly threatened by climate change and mass bleaching events. Predicting how corals will respond to rapid ocean warming requires a better understanding of how they have responded to environmental change in the past & #8211 information that can be reconstructed from coral skeletal records. However, significant knowledge gaps remain in our understanding of how coral biomineralization and the incorporation of geochemical tracers is impacted by heat stress and bleaching, particularly since the physiological status of corals used for reconstruction of past stress events is often unknown. Using boron-based geochemical tracers (& #948 & sup& & /sup& B, B/Ca), we investigated how heat stress caused by a marine heatwave impacted the carbonate chemistry of the coral calcifying fluid as well as skeletal trace element composition in the branching coral & em& Acropora aspera& /em& . Importantly, we recorded in situ temperature and coral health status during the bleaching event and after 7 months of recovery. We show that heat-stressed & em& Acropora& /em& corals continued to upregulate the pH of their calcifying fluid (cf) however, dissolved inorganic carbon upregulation inside the cf was significantly disrupted by heat stress. Similarly, we observed suppression of the typical seasonality in the temperature proxies Sr/Ca, Mg/Ca, Li/Ca and Li/Mg, likely due to a combination of reduced growth rates, disruption of key enzymes involved in calcification and Rayleigh fractionation. Anomalies in TE/Ca ratios were still observed 7 months after peak bleaching, even though symbiont densities and chlorophyll a concentrations were fully restored at this point. Interestingly, the response to heat stress did not differ between the thermally variable intertidal and the thermally more moderate subtidal environments whose coral populations are known to have a different heat tolerance, nor between colonies with varying degrees of bleaching. Our findings suggest that coral biomineralization mechanisms are highly sensitive to heat stress, and that the biogeochemical stress response of branching & em& Acropora& /em& corals is remarkably consistent with that of massive & em& Porites& /em& corals.& &
Sources of mineralising fluids for the Olympic Dam deposit (South Australia) : SmNd isotopic constraints
Publisher: Elsevier BV
Date: 04-1995
Precise and accurate determination of 147Sm/144Nd and 143Nd/144Nd in monazite using laser ablation-MC-ICPMS
Publisher: Elsevier BV
Date: 07-03-2011
A speleothem record of Holocene climate variability from southwestern Mexico
Publisher: Cambridge University Press (CUP)
Date: 2011
DOI: 10.1016/J.YQRES.2010.09.002
Abstract: A paleoclimate reconstruction for the Holocene based upon variations of δ 18 O in a U–Th dated stalagmite from southwestern Mexico is presented. Our results indicate that the arrival of moisture to the area has been strongly linked to the input of glacial meltwaters into the North Atlantic throughout the Holocene. The record also suggests a complex interplay between Caribbean and Pacific moisture sources, modulated by the North Atlantic SST and the position of the ITCZ, where Pacific moisture becomes increasingly more influential through ENSO since ~ 4.3 ka. The interruption of stalagmite growth during the largest climatic anomalies of the Holocene (10.3 and 8.2 ka) is evidenced by the presence of hiatuses, which suggest a severe disruption in the arrival of moisture to the area. The δ 18 O record presented here has important implications for understanding the evolution of the North American Monsoon and climate in southwestern Mexico, as it represents one of the most detailed archives of climate variability for the area spanning most of the Holocene.
Coral calcifying fluid aragonite saturation states derived from Raman spectroscopy
Publisher: Copernicus GmbH
Date: 24-11-2017
Abstract: Abstract. Quantifying the saturation state of aragonite (ΩAr) within the calcifying fluid of corals is critical for understanding their biomineralization process and sensitivity to environmental changes including ocean acidification. Recent advances in microscopy, microprobes, and isotope geochemistry enable the determination of calcifying fluid pH and [CO32−], but direct quantification of ΩAr (where ΩAr = [CO32−][Ca2+]∕Ksp) has proved elusive. Here we test a new technique for deriving ΩAr based on Raman spectroscopy. First, we analysed abiogenic aragonite crystals precipitated under a range of ΩAr from 10 to 34, and we found a strong dependence of Raman peak width on ΩAr with no significant effects of other factors including pH, Mg∕Ca partitioning, and temperature. Validation of our Raman technique for corals is difficult because there are presently no direct measurements of calcifying fluid ΩAr available for comparison. However, Raman analysis of the international coral standard JCp-1 produced ΩAr of 12.3 ± 0.3, which we demonstrate is consistent with published skeletal Mg∕Ca, Sr∕Ca, B∕Ca, δ11B, and δ44Ca data. Raman measurements are rapid ( ≤ 1 s), high-resolution ( ≤ 1 µm), precise (derived ΩAr ± 1 to 2 per spectrum depending on instrument configuration), accurate ( ±2 if ΩAr 20), and require minimal s le preparation, making the technique well suited for testing the sensitivity of coral calcifying fluid ΩAr to ocean acidification and warming using s les from natural and laboratory settings. To demonstrate this, we also show a high-resolution time series of ΩAr over multiple years of growth in a Porites skeleton from the Great Barrier Reef, and we evaluate the response of ΩAr in juvenile Acropora cultured under elevated CO2 and temperature.
pH variability at volcanic CO2 seeps regulates coral calcifying fluid chemistry
Publisher: Wiley
Date: 04-02-2022
DOI: 10.1111/GCB.16093
Abstract: Coral reefs are iconic ecosystems with immense ecological, economic and cultural value, but globally their carbonate‐based skeletal construction is threatened by ocean acidification (OA). Identifying coral species that have specialised mechanisms to maintain high rates of calcification in the face of declining seawater pH is of paramount importance in predicting future species composition, and growth of coral reefs. Here, we studied multiple coral species from two distinct volcanic CO 2 seeps in Papua New Guinea to assess their capacity to control their calcifying fluid (CF) chemistry. Several coral species living under conditions of low mean seawater pH, but with either low or high variability in seawater pH, were examined and compared with those living in ‘normal’ (non‐seep) ambient seawater pH. We show that when mean seawater pH is low but highly variable, corals have a greater ability to maintain constant pH cf in their CF, but this characteristic was not linked with changes in abundance. Within less variable low pH seawater, corals with limited reductions in pH cf at the seep sites compared with controls tended to be more abundant at the seep site than at the control site. However, this finding was strongly influenced by a single species ( Montipora foliosa ), which was able to maintain complete pH cf homeostasis. Overall, although our findings indicate that there might be an association between ecological success and greater pH cf homeostasis, further research with additional species and at more sites with differing seawater pH regimes is required to solidify inferences regarding coral ecological success under future OA.
In situ Mg isotope measurements of biogenic carbonates using laser ablation multi‐collector inductively coupled plasma mass spectrometry: A new tool to understand biomineralisation
Publisher: Wiley
Date: 16-09-2020
DOI: 10.1002/RCM.8918
Melting of a subduction-modified continental lithospheric mantle: evidence from late Proterozoic mafic dike swarms in central Australia
Publisher: Geological Society of America
Date: 1993
Sr and Nd isotopes as tracers of clastic sources in Lake Le Bourget sediment (NW Alps, France) during the Little Ice Age: Palaeohydrology implications
Publisher: Elsevier BV
Date: 12-2005
Coral calcification mechanisms facilitate adaptive responses to ocean acidification
Publisher: The Royal Society
Date: 06-12-2017
Abstract: Ocean acidification (OA) is a pressing threat to reef-building corals, but it remains poorly understood how coral calcification is inhibited by OA and whether corals could acclimatize and/or adapt to OA. Using a novel geochemical approach, we reconstructed the carbonate chemistry of the calcifying fluid in two coral species using both a pH and dissolved inorganic carbon (DIC) proxy (δ 11 B and B/Ca, respectively). To address the potential for adaptive responses, both species were collected from two sites spanning a natural gradient in seawater pH and temperature, and then subjected to three pH T levels (8.04, 7.88, 7.71) crossed by two temperatures (control, +1.5°C) for 14 weeks. Corals from the site with naturally lower seawater pH calcified faster and maintained growth better under simulated OA than corals from the higher-pH site. This ability was consistently linked to higher pH yet lower DIC values in the calcifying fluid, suggesting that these differences are the result of long-term acclimatization and/or local adaptation to naturally lower seawater pH. Nevertheless, all corals elevated both pH and DIC significantly over seawater values, even under OA. This implies that high pH upregulation combined with moderate levels of DIC upregulation promote resistance and adaptive responses of coral calcification to OA.
Petrogenesis and geodynamic implications of late Cenozoic basalts in North Queensland, Australia: Trace-element and Sr-Nd-Pb isotope evidence
Publisher: Oxford University Press (OUP)
Date: 04-2001
Mid-Pleistocene cave fills, megafaunal remains and climate change at Naracoorte, South Australia: Towards a predictive model using U-Th dating of speleothems
Publisher: Elsevier BV
Date: 06-2000
Granitoids of northern Victoria Land, Antarctica: implications of chemical and isotopic variations to regional crustal structure and tectonics.
Publisher: American Journal of Science (AJS)
Date: 02-1987
The use of radiogenic isotopes for identifying the mineralising fluid source at the Wallaby Gold Deposit, Northeastern Goldfields, Western Australia
Publisher: Elsevier BV
Date: 08-2006
CHEMICAL GEODYNAMICS IN THE BACK-ARC REGION OF JAPAN BASED ON THE TRACE-ELEMENT AND SR-ND ISOTOPIC COMPOSITIONS
Publisher: Elsevier BV
Date: 03-1990
Similar controls on calcification under ocean acidification across unrelated coral reef taxa
Publisher: Wiley
Date: 08-2018
DOI: 10.1111/GCB.14379
Abstract: Ocean acidification (OA) is a major threat to marine ecosystems, particularly coral reefs which are heavily reliant on calcareous species. OA decreases seawater pH and calcium carbonate saturation state (Ω), and increases the concentration of dissolved inorganic carbon (DIC). Intense scientific effort has attempted to determine the mechanisms via which ocean acidification (OA) influences calcification, led by early hypotheses that calcium carbonate saturation state (Ω) is the main driver. We grew corals and coralline algae for 8-21 weeks, under treatments where the seawater parameters Ω, pH, and DIC were manipulated to examine their differential effects on calcification rates and calcifying fluid chemistry (Ω
Boron Isotopic Systematics in Scleractinian Corals and the Role of pH Up-regulation
Publisher: Springer International Publishing
Date: 18-11-2017
Supplementary material to "Coral calcifying fluid aragonite saturation states derived from Raman spectroscopy"
Publisher: Copernicus GmbH
Date: 29-06-2017
Sr/Ca and δ18O seasonality in a Porites coral from the MIS 9 (339-303 ka) interglacial
Publisher: Elsevier BV
Date: 08-2006
Heavy metal incorporation in foraminiferal calcite under variable environmental and acute level seawater pollution: multi-element culture experiments for Amphisorus hemprichii
Publisher: Springer Science and Business Media LLC
Date: 16-08-2021
Groundwater in the Broken Hill region, Australia: recognising interaction with bedrock and mineralisation using S, Sr and Pb isotopes
Publisher: Elsevier BV
Date: 04-2005
Geochemical and Nd isotopic study of Palaeozoic bimodal volcanics in Hainan Island, South China-Implications for rifting tectonics and mantle reservoirs
Publisher: Elsevier BV
Date: 12-1992
Coral resistance to ocean acidification linked to increased calcium at the site of calcification
Publisher: The Royal Society
Date: 02-05-2018
Abstract: Ocean acidification threatens the persistence of biogenic calcium carbonate (CaCO 3 ) production on coral reefs. However, some coral genera show resistance to declines in seawater pH, potentially achieved by modulating the chemistry of the fluid where calcification occurs. We use two novel geochemical techniques based on boron systematics and Raman spectroscopy, which together provide the first constraints on the sensitivity of coral calcifying fluid calcium concentrations ( ) to changing seawater pH. In response to simulated end-of-century pH conditions, Pocillopora damicornis increased to as much as 25% above that of seawater and maintained constant calcification rates. Conversely, Acropora youngei displayed less control over , and its calcification rates strongly declined at lower seawater pH. Although the role of in driving calcification has often been neglected, increasing may be a key mechanism enabling more resistant corals to cope with ocean acidification and continue to build CaCO 3 skeletons in a high-CO 2 world.
Reviews and syntheses: Revisiting the boron systematics of aragonite and their application to coral calcification
Publisher: Copernicus GmbH
Date: 09-05-2018
Abstract: Abstract. The isotopic and elemental systematics of boron in aragonitic coral skeletons have recently been developed as a proxy for the carbonate chemistry of the coral extracellular calcifying fluid. With knowledge of the boron isotopic fractionation in seawater and the B∕Ca partition coefficient (KD) between aragonite and seawater, measurements of coral skeleton δ11B and B∕Ca can potentially constrain the full carbonate system. Two sets of abiogenic aragonite precipitation experiments designed to quantify KD have recently made possible the application of this proxy system. However, while different KD formulations have been proposed, there has not yet been a comprehensive analysis that considers both experimental datasets and explores the implications for interpreting coral skeletons. Here, we evaluate four potential KD formulations: three previously presented in the literature and one newly developed. We assess how well each formulation reconstructs the known fluid carbonate chemistry from the abiogenic experiments, and we evaluate the implications for deriving the carbonate chemistry of coral calcifying fluid. Three of the KD formulations performed similarly when applied to abiogenic aragonites precipitated from seawater and to coral skeletons. Critically, we find that some uncertainty remains in understanding the mechanism of boron elemental partitioning between aragonite and seawater, and addressing this question should be a target of additional abiogenic precipitation experiments. Despite this, boron systematics can already be applied to quantify the coral calcifying fluid carbonate system, although uncertainties associated with the proxy system should be carefully considered for each application. Finally, we present a user-friendly computer code that calculates coral calcifying fluid carbonate chemistry, including propagation of uncertainties, given inputs of boron systematics measured in coral skeleton.
Evidence for ocean acidification in the Great Barrier Reef of Australia
Publisher: Elsevier BV
Date: 04-2009
Basalt basement from the Kerguelen Plateau and the trail of a Dupal plume
Publisher: Springer Science and Business Media LLC
Date: 1989
DOI: 10.1007/BF01041753
Geochemical and Sr-Nd-Pb isotopic characteristics of Late Cenozoic leucite lamproites from the East European Alpine belt (Macedonia and Yugoslavia)
Publisher: Springer Science and Business Media LLC
Date: 03-2004
Source of trace element variability in Great Barrier Reef corals affected by the Burdekin flood plumes
Publisher: Elsevier BV
Date: 2003
Geochemical and Sm-Nd isotopic study of Neoproterozoic ophiolites from southeastern China: Petrogenesis and tectonic implications
Publisher: Elsevier BV
Date: 1997
Geochemical and Nd-isotopic systematics of the Permo-Triassic Gympie Group, Southeast Queensland
Publisher: Informa UK Limited
Date: 06-2001
Environmental constraints on Holocene cold-water coral reef growth off Norway: Insights from a multiproxy approach
Publisher: American Geophysical Union (AGU)
Date: 10-2016
DOI: 10.1002/2016PA002974
Linkages between coral assemblages and coral proxies of terrestrial exposure along a cross-shelf gradient on the southern Great Barrier Reef
Publisher: Springer Science and Business Media LLC
Date: 13-09-2008
Long-Term Impacts of the 1997–1998 Bleaching Event on the Growth and Resilience of Massive Porites Corals From the Central Red Sea
Publisher: American Geophysical Union (AGU)
Date: 06-2019
DOI: 10.1029/2019GC008312
Multi-proxy constraints on the climatic significance of trace element records from a New Zealand speleothem
Publisher: Elsevier BV
Date: 06-2000
Global warming and recurrent mass bleaching of corals
Publisher: Springer Science and Business Media LLC
Date: 03-2017
DOI: 10.1038/NATURE21707
Abstract: During 2015-2016, record temperatures triggered a pan-tropical episode of coral bleaching, the third global-scale event since mass bleaching was first documented in the 1980s. Here we examine how and why the severity of recurrent major bleaching events has varied at multiple scales, using aerial and underwater surveys of Australian reefs combined with satellite-derived sea surface temperatures. The distinctive geographic footprints of recurrent bleaching on the Great Barrier Reef in 1998, 2002 and 2016 were determined by the spatial pattern of sea temperatures in each year. Water quality and fishing pressure had minimal effect on the unprecedented bleaching in 2016, suggesting that local protection of reefs affords little or no resistance to extreme heat. Similarly, past exposure to bleaching in 1998 and 2002 did not lessen the severity of bleaching in 2016. Consequently, immediate global action to curb future warming is essential to secure a future for coral reefs.
Assessment of coral δ44/40Ca as a paleoclimate proxy in the Great Barrier Reef of Australia
Publisher: Elsevier BV
Date: 10-2016
Isotopic and geochemical systematics in Tertiary-Recent basalts from southeastern Australia and implications for the evolution of the sub-continental lithosphere
Publisher: Elsevier BV
Date: 10-1985
Growth of archaean crust within the western gneiss terrain, yilgarn block, Western Australia
Publisher: Informa UK Limited
Date: 07-1983
Sm-nd and rb-sr dating of archaean gneisses, eastern yilgarn block, Western Australia
Publisher: Informa UK Limited
Date: 07-1983
THE EVOLVING EARTH
Publisher: Elsevier BV
Date: 09-1993
Minerogenesis of Shilu iron ores with special reference to Sm-Nd isotope geochemical characteristics of Shilu Group bimodal volcanic rocks in Hainan Island
Publisher: Springer Science and Business Media LLC
Date: 07-1994
DOI: 10.1007/BF02840328
Physical and Biological Controls on the Carbonate Chemistry of Coral Reef Waters: Effects of Metabolism, Wave Forcing, Sea Level, and Geomorphology
Publisher: Public Library of Science (PLoS)
Date: 09-01-2013
Calibration of Sr/Ca, Li/Mg and Sr-U Paleothermometry in Branching and Foliose Corals
Publisher: American Geophysical Union (AGU)
Date: 08-2019
DOI: 10.1029/2018PA003426
Environmental and physiochemical controls on coral calcification along a latitudinal temperature gradient in Western Australia
Publisher: Wiley
Date: 19-11-2019
DOI: 10.1111/GCB.14488
Abstract: The processes that occur at the micro-scale site of calcification are fundamental to understanding the response of coral growth in a changing world. However, our mechanistic understanding of chemical processes driving calcification is still evolving. Here, we report the results of a long-term in situ study of coral calcification rates, photo-physiology, and calcifying fluid (cf) carbonate chemistry (using boron isotopes, elemental systematics, and Raman spectroscopy) for seven species (four genera) of symbiotic corals growing in their natural environments at tropical, subtropical, and temperate locations in Western Australia (latitudinal range of ~11°). We find that changes in net coral calcification rates are primarily driven by pH
Mechanisms and seasonal drivers of calcification in the temperate coral Turbinaria reniformis at its latitudinal limits
Publisher: The Royal Society
Date: 23-05-2018
Abstract: High-latitude coral reefs provide natural laboratories for investigating the mechanisms and limits of coral calcification. While the calcification processes of tropical corals have been studied intensively, little is known about how their temperate counterparts grow under much lower temperature and light conditions. Here, we report the results of a long-term (2-year) study of seasonal changes in calcification rates, photo-physiology and calcifying fluid (cf) chemistry (using boron isotope systematics and Raman spectroscopy) for the coral Turbinaria reniformis growing near its latitudinal limits (34.5° S) along the southern coast of Western Australia. In contrast with tropical corals, calcification rates were found to be threefold higher during winter (16 to 17° C) compared with summer (approx. 21° C), and negatively correlated with light, but lacking any correlation with temperature. These unexpected findings are attributed to a combination of higher chlorophyll a, and hence increased heterotrophy during winter compared with summer, together with the corals' ability to seasonally modulate pH cf , with carbonate ion concentration being the main controller of calcification rates. Conversely, calcium ion concentration [Ca 2+ ] cf declined with increasing calcification rates, resulting in aragonite saturation states Ω cf that were stable yet elevated fourfold above seawater values. Our results show that corals growing near their latitudinal limits exert strong physiological control over their cf in order to maintain year-round calcification rates that are insensitive to the unfavourable temperature regimes typical of high-latitude reefs.
High resolution analysis of trace elements in corals by laser ablation ICP-MS
Publisher: Elsevier BV
Date: 06-1998
Anthropogenic ocean warming and acidification recorded by Sr/Ca, Li/Mg, δ11B and B/Ca in Porites coral from the Kimberley region of northwestern Australia
Publisher: Elsevier BV
Date: 08-2019
Response of coral calcification and calcifying fluid composition to thermally induced bleaching stress
Publisher: Springer Science and Business Media LLC
Date: 19-05-2017
DOI: 10.1038/S41598-017-02306-X
Abstract: Severe, global-scale thermal stress events like those of 1998 and 2016, are becoming more frequent and intense, potentially compromising the future of coral reefs. Here we report the effects of the 1998 bleaching event on coral calcification as well as the composition of the calcifying fluid (cf) from which corals precipitate their calcium carbonate skeletons. This was investigated by using the Sr/Ca, Li/Mg (temperature), and boron isotopes (δ 11 B) and B/Ca (carbonate chemistry) proxies in a Porites sp. coral. Following the summer of 1998 the coral exhibited a prolonged period (~18 months) of reduced calcification (~60%) and a breakdown in the seasonality of the geochemical proxies. However, the maintenance of elevated dissolved inorganic carbon (DIC cf ×2 seawater) and pH cf ( .3 compared to seawater ~8.0) even during severe stress of 1998 indicate that a minimum threshold of high aragonite saturation state (Ω cf ) of ~14 (~×4 seawater), is an essential pre-requisite for coral calcification. However, despite maintaining elevated levels of Ω cf even under severe stress, coral growth is still impaired. We attribute this to reductions in either the effective active volume of calcification and/or DIC cf as bleaching compromises the photosynthetically fixed carbon pool available to the coral.
Heat stress differentially impacts key calcification mechanisms in reef-building corals
Publisher: Springer Science and Business Media LLC
Date: 07-01-2021
Timing and exhumation of eclogite facies shear zones, Musgrave Block, central Australia
Publisher: Wiley
Date: 11-1997
Uranium-series dating and growth characteristics of the deep-sea scleractinian coral: Enallopsammia rostrata from the Equatorial Pacific
Publisher: Elsevier BV
Date: 04-2010
Boron isotope geochemistry of Australian salt lakes
Publisher: Elsevier BV
Date: 09-1991
Geochemical and isotopic systematics in carbonatites and implications for the evolution of ocean-island sources
Publisher: Elsevier BV
Date: 1988
More anomalies from the Allende Meteorite: Samarium
Publisher: American Geophysical Union (AGU)
Date: 07-1978
The age and origin of unconformity-type uranium deposits, Sm-Nd and Rb-Sr isotopic evidence
Publisher: Elsevier BV
Date: 08-1988
Coupling of in-situ Sm-Nd systematics and U-Pb dating of monazite and allanite with applications to crustal evolution studies
Publisher: Elsevier BV
Date: 10-2007
Dampier Ridge, Tasman Sea, as a stranded continental fragment
Publisher: Informa UK Limited
Date: 10-1994
Thermally Variable, Macrotidal Reef Habitats Promote Rapid Recovery From Mass Coral Bleaching
Publisher: Frontiers Media SA
Date: 19-05-2020
Sm-Nd ages of the Arunta, Tennant Creek, and Georgetown Inliers of northern Australia
Publisher: Informa UK Limited
Date: 03-1984
Perennial growth of hermatypic corals at Rottnest Island, Western Australia (32°S)
Publisher: PeerJ
Date: 24-02-2015
DOI: 10.7717/PEERJ.781
Accurate and precise microscale measurements of boron isotope ratios in calcium carbonates using laser ablation multicollector-ICPMS
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8JA00444G
Abstract: The boron isotope compositions (δ 11 B) of biogenic carbonates have proven to be an invaluable tool for investigating changes in ocean carbonate chemistry, especially the impacts of declining seawater pH due to rising levels of atmospheric CO 2 .
Marginal Reefs Under Stress: Physiological Limits Render Galápagos Corals Susceptible to Ocean Acidification and Thermal Stress
Publisher: American Geophysical Union (AGU)
Date: 02-2022
DOI: 10.1029/2021AV000509
Abstract: Ocean acidification (OA) and thermal stress may undermine corals' ability to calcify and support erse reef communities, particularly in marginal environments. Coral calcification depends on aragonite supersaturation (Ω » 1) of the calcifying fluid (cf) from which the skeleton precipitates. Corals actively upregulate pH cf relative to seawater to buffer against changes in temperature and dissolved inorganic carbon, which together control Ω cf . Here we assess the buffering capacity of modern and fossil corals from the Galápagos Islands that have been exposed to sub‐optimal conditions, extreme thermal stress, and OA. We demonstrate a significant decline in pH cf and Ω cf since the pre‐industrial era, trends which are exacerbated during extreme warm years. These results suggest that there are likely physiological limits to corals' pH buffering capacity, and that these constraints render marginal reefs particularly susceptible to OA.
High-precision U-series measurements of more than 500,000 year old fossil corals
Publisher: Elsevier BV
Date: 2008
Phosphate defects and apatite inclusions in coral skeletal aragonite revealed by solid-state NMR spectroscopy
Publisher: Elsevier BV
Date: 12-2011
Early (≥4.5 Ga) formation of terrestrial crust: Lu–Hf, δ18O, and Ti thermometry results for Hadean zircons
Publisher: Elsevier BV
Date: 04-2008
Short-Term Coral Bleaching Is Not Recorded by Skeletal Boron Isotopes
Publisher: Public Library of Science (PLoS)
Date: 14-11-2014
Rare earth element and neodymium isotopic compositions of the banded iron-formations and associated shales from Hamersley, western Australia
Publisher: Elsevier BV
Date: 1993
Uranium-series dating rock art in East Timor
Publisher: Elsevier BV
Date: 06-2007
Movements of Diadromous Fish in Large Unregulated Tropical Rivers Inferred from Geochemical Tracers
Publisher: Public Library of Science (PLoS)
Date: 06-04-2011
Sm-Nd, Rb-Sr, and18O/16O isotopic systematics in an oceanic crustal section: evidence from the Samail ophiolite.
Publisher: American Geophysical Union (AGU)
Date: 10-04-1981
SM-ND ISOTOPIC SYSTEMATICS OF ENDERBY LAND GRANULITES AND EVIDENCE FOR THE REDISTRIBUTION OF SM AND ND DURING METAMORPHISM
Publisher: Elsevier BV
Date: 11-1984
Geochemistry of coral from Papua New Guinea as a proxy for ENSO ocean-atmosphere interactions in the Pacific Warm Pool
Publisher: Elsevier BV
Date: 12-2012
Is Ocean Acidification an Open-Ocean Syndrome? Understanding Anthropogenic Impacts on Seawater pH
Publisher: Springer Science and Business Media LLC
Date: 03-2013
A simple biomineralization model to explain Li, Mg, and Sr incorporation into aragonitic foraminifera and corals
Publisher: Elsevier BV
Date: 2018
Deep-water coral records of glacial and recent ocean-atmosphere dynamics from the Perth Canyon in the southeast Indian Ocean
Publisher: Elsevier BV
Date: 04-2022
Rapid trace element analysis of speleothems by ELA-ICP-MS
Publisher: Elsevier BV
Date: 07-2006
Tracing the life history of individual barramundi using laser ablation MC-ICP-MS Sr-isotopic and Sr/Ba ratios in otoliths
Publisher: CSIRO Publishing
Date: 2005
DOI: 10.1071/MF04184
Abstract: Otoliths preserve a continuous geochemical record of its life history, from the earliest natal stage through to adulthood. Using in situ laser ablation (UV) multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) measurements of Sr isotopic compositions together with elemental abundances (Ca, Sr, Ba and Mg), we show how it is possible to characterise the various types of habitats encountered throughout the lifecycle history of in idual barramundi. Unlike trace element concentrations, which can be modulated by physiological processes, Sr isotopic compositions of otoliths provide a direct fingerprint of the water mass in which the fish lived. Elemental abundances, in particular Sr/Ba ratios are, however, shown to be especially sensitive to transitional environments, such as estuaries. The flexibility of the barramundi’s life history is confirmed by the present study, with the existence of both marine and freshwater nurseries, with some in iduals spending their entire life cycle in fresh water, some entirely in marine and others moving between freshwater estuarine and marine habitats.
A neodymium, strontium, and oxygen isotopic study of the Cretaceous Samail ophiolite and implications for the petrogenesis and seawater-hydrothermal alteration of oceanic crust
Publisher: Elsevier BV
Date: 1980
Coral calcification mechanisms in a warming ocean and the interactive effects of temperature and light
Publisher: Springer Science and Business Media LLC
Date: 30-03-2022
DOI: 10.1038/S43247-022-00396-8
Abstract: Ocean warming is transforming the world’s coral reefs, which are governed by the growth of marine calcifiers, most notably branching corals. Critical to skeletal growth is the corals’ regulation of their internal chemistry to promote calcification. Here we investigate the effects of temperature and light on the calcifying fluid chemistry (using boron isotope systematics), calcification rates, metabolic rates and photo-physiology of Acropora nasuta during two mesocosm experiments simulating seasonal and static temperature and light regimes. Under the seasonal regime, coral calcification rates, calcifying fluid carbonate chemistry, photo-physiology and metabolic productivity responded to both changes in temperature and light. However, under static conditions the artificially prolonged exposure to summer temperatures resulted in heat stress and a heightened sensitivity to light. Our results indicate that temperature and light effects on coral physiology and calcification mechanisms are interactive and context-specific, making it essential to conduct realistic multi-variate dynamic experiments in order to predict how coral calcification will respond to ocean warming.
Lithium isotopic compositions of the New England Batholith: Correlations with inferred source rock compositions
Publisher: Geological Society of America
Date: 2004
Rapid Fluctuations in Sea Level Recorded at Huon Peninsula During the Penultimate Deglaciation
Publisher: American Association for the Advancement of Science (AAAS)
Date: 08-01-1999
DOI: 10.1126/SCIENCE.283.5399.197
Abstract: About 140,000 years ago, the breakup of large continental ice sheets initiated the Last Interglacial period. Sea level rose and peaked around 135,000 years ago about 14 meters below present levels. A record of Last Interglacial sea levels between 116,000 years to 136,000 years ago is preserved at reef VII of the uplifted coral terraces of Huon Peninsula in Papua New Guinea. However, corals from a cave situated about 90 meters below the crest of reef VII are 130,000 ± 2000 years old and appear to have grown in conditions that were 6°C cooler than those at present. These observations imply a drop in sea level of 60 to 80 meters. After 130,000 years, sea level began rising again in response to the major insolation maximum at 126,000 to 128,000 years ago. The early (about 140,000 years ago) start of the penultimate deglaciation, well before the peak in insolation, is consistent with the Devils Hole chronology.
Deconvolving the long-term impacts of ocean acidification and warming on coral biomineralisation
Publisher: Elsevier BV
Date: 11-2019
BONINITE PETROGENESIS - CHEMICAL AND ND-SR ISOTOPIC CONSTRAINTS
Publisher: Elsevier BV
Date: 10-1983
Strontium and carbon isotope tracers and the origins of soil carbonate in South Australia and Victoria
Publisher: Elsevier BV
Date: 1995
SmNd mineral isochron ages of Late Proterozoic dyke swarms in Australia: evidence for two distinctive events of mafic magmatism and crustal extension
Publisher: Elsevier BV
Date: 10-1993
Pliocene-Quaternary history of Futuna Island, South Vanuatu, southwest Pacific
Publisher: Informa UK Limited
Date: 12-2001
Climate reconstructions and monitoring in the Mediterranean Sea: A review on some recently discovered high-resolution marine archives
Publisher: Springer Science and Business Media LLC
Date: 07-2008
Arc and back-arc geochemistry in the southern Kermadec arc-Ngatoro Basin and offshore Taupo Volcanic Zone, SW Pacific
Publisher: Geological Society of London
Date: 1994
A high-resolution record of vertically-resolved seawater salinity in the Caribbean Sea mixed layer since 1700 AD.
Publisher: Copernicus GmbH
Date: 27-03-2022
DOI: 10.5194/EGUSPHERE-EGU22-1388
Abstract: & & The Caribbean Sea in the tropical Atlantic is one of the major heat engines of the Earth and a sensitive area for monitoring climate variability. Salinity changes in the Caribbean Sea record changes in ocean currents and can provide information about variations in ocean heat transport. Seawater salinity in the Caribbean Sea has been monitored in recent decades, nevertheless, of all oceanographic environmental parameters salinity information before the instrumental period remains limited, due to the difficulty of reconstructing salinity, arguably the most difficult natural archives to recreate. We were able to reconstruct salinity changes in the Caribbean Sea from 1700 to the present from southwest Puerto Rico using slowly growing and long-lived scelerosponges from southwest Puerto Rico. These well-dated sponges are known to precipitate their skeletons in isotopic equilibrium (i.e., their record is not affected much by vital effects) and were retrieved from various depths in the mixed layer, from the surface to 90 m depth. We were able to establish salinity changes by deconvoluting stable isotopes (d& sup& & /sup& O) and trace element (Sr/Ca) proxies taken from the sponges at regular intervals. In this contribution, we will present the salinity record and illustrate the process for salinity reconstruction. We will also discuss how we determine how salinity changes in our record relate to radiative forcing as well as connect them with dominant mechanisms operating in the region, including changes in the position of the InterTtropical Convergence Zone and intensity of the Atlantic meridional Overturning Circulation over time.& &
Reduced calcification in Western Australian corals during anomalously high summer water temperatures
Publisher: Elsevier BV
Date: 12-2014
Applications of the 238U-230Th decay series to dating of fossil and modern corals using MC-ICPMS
Publisher: Informa UK Limited
Date: 08-2008
The isotopic and elemental abundance of ytterbium in meteorites and terrestrial samples
Publisher: Elsevier BV
Date: 12-1977
Author Correction: Stress-resistant corals may not acclimatize to ocean warming but maintain heat tolerance under cooler temperatures
Publisher: Springer Science and Business Media LLC
Date: 04-10-2023
SM-ND AND RB-SR DATING OF AN ARCHEAN MASSIVE SULFIDE DEPOSIT - KIDD-CREEK, ONTARIO
Publisher: Geological Society of America
Date: 1986
Uranium uptake history, open-system behaviour and uranium-series ages of fossil Tridacna gigas from Huon Peninsula, Papua New Guinea
Publisher: Elsevier BV
Date: 09-2017
Coral proxy record of decadal-scale reduction in base flow from Moloka'i, Hawaii
Publisher: American Geophysical Union (AGU)
Date: 12-2009
DOI: 10.1029/2009GC002714
U-series evidence for widespread reef development in Shark Bay during the last interglacial
Publisher: Elsevier BV
Date: 03-2008
Long-term records of coral calcification across the central Great Barrier Reef: assessing the impacts of river runoff and climate change
Publisher: Springer Science and Business Media LLC
Date: 23-08-2013
Abrupt Decrease in Tropical Pacific Sea Surface Salinity at End of Little Ice Age
Publisher: American Association for the Advancement of Science (AAAS)
Date: 22-02-2002
Abstract: A 420-year history of strontium/calcium, uranium/calcium, and oxygen isotope ratios in eight coral cores from the Great Barrier Reef, Australia, indicates that sea surface temperature and salinity were higher in the 18th century than in the 20th century. An abrupt freshening after 1870 occurred simultaneously throughout the southwestern Pacific, coinciding with cooling tropical temperatures. Higher salinities between 1565 and 1870 are best explained by a combination of advection and wind-induced evaporation resulting from a strong latitudinal temperature gradient and intensified circulation. The global Little Ice Age glacial expansion may have been driven, in part, by greater poleward transport of water vapor from the tropical Pacific.
High-resolution paleoclimate of the MIS 11 interglacial (423-360 ka) using geochemical proxies in giant Tridacna clams
Publisher: Elsevier BV
Date: 08-2006
Provenance of early archaean sediments from the northern Yilgarn Block of Western Australia: Isotopic constraints
Publisher: Elsevier BV
Date: 08-1988
The isotopic composition and elemental abundance of lutetium in meteorites and terrestrial samples and the 176Lu cosmochronometer
Publisher: Elsevier BV
Date: 1976
Rapid multi-generational acclimation of coralline algal reproductive structures to ocean acidification
Publisher: The Royal Society
Date: 12-05-2021
Abstract: The future of coral reef ecosystems is under threat because vital reef-accreting species such as coralline algae are highly susceptible to ocean acidification. Although ocean acidification is known to reduce coralline algal growth rates, its direct effects on the development of coralline algal reproductive structures (conceptacles) is largely unknown. Furthermore, the long-term, multi-generational response of coralline algae to ocean acidification is extremely understudied. Here, we investigate how mean pH, pH variability and the pH regime experienced in their natural habitat affect coralline algal conceptacle abundance and size across six generations of exposure. We show that second-generation coralline algae exposed to ocean acidification treatments had conceptacle abundances 60% lower than those kept in present-day conditions, suggesting that conceptacle development is initially highly sensitive to ocean acidification. However, this negative effect of ocean acidification on conceptacle abundance disappears after three generations of exposure. Moreover, we show that this transgenerational acclimation of conceptacle development is not facilitated by a trade-off with reduced investment in growth, as higher conceptacle abundances are associated with crusts with faster growth rates. These results indicate that the potential reproductive output of coralline algae may be sustained under future ocean acidification.
A strontium isotopic investigation of the Bjerkreim-Sokndal layered intrusion, southwest Norway
Publisher: Oxford University Press (OUP)
Date: 1996
A simple method for the precise determination of ≥ 40 trace elements in geological samples by ICPMS using enriched isotope internal standardisation
Publisher: Elsevier BV
Date: 1997
Supplementary material to "Multi-trace element sea surface temperature coral reconstruction for the southern Mozambique Channel reveals teleconnections with the tropical Atlantic"
Publisher: Copernicus GmbH
Date: 16-10-2018
Investigating marine bio‐calcification mechanisms in a changing ocean with in vivo and high‐resolution ex vivo Raman spectroscopy
Publisher: Wiley
Date: 20-02-2019
DOI: 10.1111/GCB.14579
Diurnal cycles of coral calcifying fluid aragonite saturation state
Publisher: Springer Science and Business Media LLC
Date: 31-01-2019
Uplift rates defined by U-series and 14C ages of serpulid-encrusted speleothems from submerged caves near Siracusa, Sicily (Italy)
Publisher: Elsevier BV
Date: 02-2009
ND ISOTOPIC SYSTEMATICS AND CHEMISTRY OF CENTRAL AUSTRALIAN SAPPHIRINE GRANULITES - AN EXAMPLE OF RARE-EARTH ELEMENT MOBILITY
Publisher: Elsevier BV
Date: 09-1984
SOURCES OF METALS IN THE PORGERA GOLD DEPOSIT, PAPUA-NEW-GUINEA - EVIDENCE FROM ALTERATION, ISOTOPE, AND NOBLE-METAL GEOCHEMISTRY
Publisher: Elsevier BV
Date: 02-1991
A SEARCH FOR FOSSIL NUCLEAR-REACTORS IN THE ALLIGATOR RIVER URANIUM FIELD, AUSTRALIA - CONSTRAINTS FROM SM, GD AND ND ISOTOPIC STUDIES
Publisher: Elsevier BV
Date: 11-1990
Early marine diagenesis in corals and geochemical consequences for paleoceanographic reconstructions
Publisher: American Geophysical Union (AGU)
Date: 12-2001
DOI: 10.1029/2001GL013577
High-resolution trace and minor element compositions in deep-water scleractinian corals (Desmophyllum dianthus) from the Mediterranean Sea and the Great Australian Bight
Publisher: Springer Berlin Heidelberg
Date: 2005
High resolution windows into early Holocene climate: SrCa coral records from the Huon Peninsula
Publisher: Elsevier BV
Date: 02-1996
Conodont apatite δ88/86Sr and δ44/40Ca compositions and implications for the evolution of Palaeozoic to early Mesozoic seawater
Publisher: Elsevier BV
Date: 03-2017
Corals at their latitudinal limits: laser ablation trace element systematics in Porites from Shirigai Bay, Japan
Publisher: Elsevier BV
Date: 10-1999
GENESIS OF GRANITOID BATHOLITHS OF PENINSULAR-MALAYSIA AND IMPLICATIONS FOR MODELS OF CRUSTAL EVOLUTION - EVIDENCE FROM A ND-SR ISOTOPIC AND U-PB ZIRCON STUDY
Publisher: Elsevier BV
Date: 02-1985
Quaternary volcanic activity of the southern Red Sea: New data and assessment of models on magma sources and Afar plume-lithosphere interaction
Publisher: Elsevier BV
Date: 09-1997
Resistance to ocean acidification in coral reef taxa is not gained by acclimatization
Publisher: Springer Science and Business Media LLC
Date: 27-05-2019
Monazite geochronology and geochemistry of meta-sediments in the Narryer Gneiss Complex, Western Australia: constraints on the tectonothermal history and provenance
Publisher: Springer Science and Business Media LLC
Date: 13-03-2010
Light and temperature effects on δ<sup>11</sup>B and B / Ca ratios of the zooxanthellate coral <i>Acropora</i> sp.: results from culturing exper
Publisher: Copernicus GmbH
Date: 20-11-2012
Abstract: Abstract. The boron isotopic composition (δ11B) of marine carbonates (e.g. corals) is increasingly utilised as a proxy for paleo-pH, with the strong correlation between δ11B of marine calcifiers and seawater pH now well documented. However, the potential roles of other environmental parameters that may also influence both the boron isotopic composition and boron concentration into coral aragonite are poorly known. To overcome this, the tropical scleractinian coral Acropora sp. was cultured under 3 different temperatures (22, 25 and 28 °C) and two light conditions (200 and 400 μmol photon m−2 s−1). The δ11B indicates an increase in internal pH that is dependent on the light conditions. Changes in light intensities from 200 to 400 μmol photon m−2 s−1 seem to indicate an apparent decrease in pH at the site of calcification, contrary to what is expected in most models of light-enhanced calcification. Thus, variations in light conditions chosen to mimic average annual variations of the natural environments where Acropora sp. colonies can be found could bias pH reconstructions by about 0.05 units. For both light conditions, a significant impact of temperature on δ11B can be observed between 22 and 25 °C, corresponding to an increase of about 0.02 pH-units, while no further δ11B increase can be observed from 25 to 28 °C. This non-linear temperature effect complicates the determination of a correction factor. B / Ca ratios decrease with increasing light, consistent with the decrease in pH at the site of calcification under enhanced light intensities. When all the other parameters are constant, boron concentrations in Acropora sp. increase with increasing temperatures and increasing carbonate ion concentrations. These observations contradict previous studies where B / Ca in corals was found to vary inversely with temperature, suggesting that the controlling factors driving boron concentrations have not yet been adequately identified and might be influenced by other environmental variables and/or species-specific responses.
Coral records of reef-water pH across the central Great Barrier Reef, Australia: Assessing the influence of river runoff on inshore reefs
Publisher: Copernicus GmbH
Date: 25-02-2015
Abstract: Abstract. The boron isotopic (δ11Bcarb) compositions of long-lived Porites coral are used to reconstruct reef-water pH across the central Great Barrier Reef (GBR) and assess the impact of river runoff on inshore reefs. For the period from 1940 to 2009, corals from both inner- and mid-shelf sites exhibit the same overall decrease in δ11Bcarb of 0.086 ± 0.033‰ per decade, equivalent to a decline in seawater pH (pHsw) of ~0.017 ± 0.007 pH units per decade. This decline is consistent with the long-term effects of ocean acidification based on estimates of CO2 uptake by surface waters due to rising atmospheric levels. We also find that, compared to the mid-shelf corals, the δ11Bcarb compositions of inner-shelf corals subject to river discharge events have higher and more variable values, and hence higher inferred pHsw values. These higher δ11Bcarb values of inner-shelf corals are particularly evident during wet years, despite river waters having lower pH. The main effect of river discharge on reef-water carbonate chemistry thus appears to be from reduced aragonite saturation state and higher nutrients driving increased phytoplankton productivity, resulting in the drawdown of pCO2 and increase in pHsw. Increased primary production therefore has the potential to counter the more transient effects of low-pH river water (pHrw) discharged into near-shore environments. Importantly, however, inshore reefs also show a consistent pattern of sharply declining coral growth that coincides with periods of high river discharge. This occurs despite these reefs having higher pHsw, demonstrating the overriding importance of local reef-water quality and reduced aragonite saturation state on coral reef health.
Comparison of ESR and TIMS U/Th dating of marine isotope stage (MIS) 5e, 5c, and 5a coral from Barbados—implications for palaeo sea-level changes in the Caribbean
Publisher: Elsevier BV
Date: 2004
Response of Acropora digitifera to ocean acidification: constraints from δ11B, Sr, Mg, and Ba compositions of aragonitic skeletons cultured under variable seawater pH
Publisher: Springer Science and Business Media LLC
Date: 25-06-2015
Profiles of trace elements and stable isotopes derived from giant long-lived Tridacna gigas bivalves: Potential applications in paleoclimate studies
Publisher: Elsevier BV
Date: 09-2009
META-IGNEOUS GRANULITE XENOLITHS FROM MOUNT RUAPEHU, NEW-ZEALAND - FRAGMENTS OF ALTERED OCEANIC-CRUST
Publisher: Springer Science and Business Media LLC
Date: 11-1990
DOI: 10.1007/BF00306531
PRIMITIVE SR-87 SR-86 FROM AN ARCHEAN BARITE AND CONJECTURE ON THE EARTHS AGE AND ORIGIN
Publisher: Elsevier BV
Date: 08-1994
Environmental Records from Great Barrier Reef Corals: Inshore versus Offshore Drivers
Publisher: Public Library of Science (PLoS)
Date: 18-10-2013
Coral calcification in a changing World and the interactive dynamics of pH and DIC upregulation
Publisher: Springer Science and Business Media LLC
Date: 30-05-2017
DOI: 10.1038/NCOMMS15686
Abstract: Coral calcification is dependent on the mutualistic partnership between endosymbiotic zooxanthellae and the coral host. Here, using newly developed geochemical proxies (δ 11 B and B/Ca), we show that Porites corals from natural reef environments exhibit a close ( r 2 ∼0.9) antithetic relationship between dissolved inorganic carbon (DIC) and pH of the corals’ calcifying fluid (cf). The highest DIC cf (∼ × 3.2 seawater) is found during summer, consistent with thermal/light enhancement of metabolically (zooxanthellae) derived carbon, while the highest pH cf (∼8.5) occurs in winter during periods of low DIC cf (∼ × 2 seawater). These opposing changes in DIC cf and pH cf are shown to maintain oversaturated but stable levels of carbonate saturation ( Ω cf ∼ × 5 seawater), the key parameter controlling coral calcification. These findings are in marked contrast to artificial experiments and show that pH cf upregulation occurs largely independent of changes in seawater carbonate chemistry, and hence ocean acidification, but is highly vulnerable to thermally induced stress from global warming.
Submarine basalts from the Red Sea: New Pb, Sr, and Nd isotopic data
Publisher: American Geophysical Union (AGU)
Date: 21-05-1993
DOI: 10.1029/93GL00050
ENSO variability during MIS 11 (424-374 ka) from Tridacna gigas at Huon Peninsula, Papua New Guinea
Publisher: Elsevier BV
Date: 12-2015
The mountain-lowland debate: Deforestation and sediment transport in the upper Ganga catchment
Publisher: Elsevier BV
Date: 07-2008
DOI: 10.1016/J.JENVMAN.2007.01.046
Abstract: The Himalaya-Gangetic Plain region is the iconic ex le of the debate about the impact on lowlands of upland land-use change. Some of the scientific aspects of this debate are revisited by using new techniques to examine the role of deforestation in erosion and river sediment transport. The approach is whole-of-catchment, combining a history of deforestation with a history of sediment sources from well before deforestation. It is shown that deforestation had some effect on one very large erosional event in 1970, in the Alaknanda subcatchment of the Upper Ganga catchment, but that both deforestation and its effects on erosion and sediment transport are far from uniform in the Himalaya. Large magnitude erosional events occur for purely natural reasons. The impact on the Gangetic Plain of erosion caused by natural events and land cover change remains uncertain.
Stable isotope record and its palaeoenvironmental interpretation for a late Middle Pleistocene speleothem from Victoria Fossil Cave, Naracoorte, South Australia
Publisher: Elsevier BV
Date: 04-2000
Osmium isotopic compositions by vapor phase sample introduction using a multi-collector ICP-MS
Publisher: Royal Society of Chemistry (RSC)
Date: 23-08-2002
DOI: 10.1039/B204518D
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