ORCID Profile
0000-0002-8720-0608
Current Organisation
Queensland University of Technology
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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)
Geochemistry | Geochronology And Isotope Geochemistry | Ore Deposit Petrology | Astronomical and Space Sciences | Geology | Structural geology and tectonics | Analytical Spectrometry | Physical Geography and Environmental Geoscience | Inorganic Geochemistry | Exploration Geochemistry | Igneous And Metamorphic Petrology | Climatology (Incl. Palaeoclimatology) | Igneous and Metamorphic Petrology | Geodynamics | Geochronology | Geochemistry | Surfacewater Hydrology | Isotope Geochemistry | Exploration geochemistry | Inorganic geochemistry | Astronomy And Astrophysics |
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in the Earth Sciences | Control of Animal Pests, Diseases and Exotic Species in Farmland, Arable Cropland and Permanent Cropland Environments | Hydro-electric | Earth sciences | Chemical sciences | Physical sciences | Climate variability | Scientific Instruments | Precious (Noble) Metal Ore Exploration | Copper Ore Exploration | Global climate change adaptation measures
Related Links
Publications
Tectonic controls on distribution and stratigraphy of the Cryogenian Rapitan iron formation, northwestern Canada
Publisher: Elsevier BV
Date: 06-2016
Deep, ultra-hot-melting residues as cradles of mantle diamond
Publisher: Springer Science and Business Media LLC
Date: 15-03-2023
Geological and trace element evidence for a marine sedimentary environment of deposition and biogenicity of 3.45 Ga stromatolitic carbonates in the Pilbara Craton, and support for a reducing Archaean ocean
Publisher: Wiley
Date: 10-2003
Rare Earth Element and yttrium compositions of Archean and Paleoproterozoic Fe formations revisited: New perspectives on the significance and mechanisms of deposition
Publisher: Elsevier BV
Date: 11-2010
Goldschmidt Abstracts 2008- B
Publisher: Elsevier BV
Date: 07-2008
Rare Earth Element and Yttrium Variability in South East Queensland Waterways
Publisher: Springer Science and Business Media LLC
Date: 03-2006
Natural Obsidian Glass as an External Accuracy Reference Material in Laser Ablation‐Inductively Coupled Plasma‐Mass Spectrometry
Publisher: Wiley
Date: 14-02-2013
Using Trace Elements in Particulate Matter To Identify the Sources of Semivolatile Organic Contaminants in Air at an Alpine Site
Publisher: American Chemical Society (ACS)
Date: 30-11-2011
DOI: 10.1021/ES2027373
Abstract: An approach using trace elements in particulate matter (PM) to identify the geographic sources of atmospherically transported semivolatile organic contaminants (SOCs) was investigated. Daily s les of PM and SOCs were collected with high-volume air s lers from 16 January to 16 February 2009 at Temple Basin, a remote alpine site in New Zealand's Southern Alps. The most commonly detected pesticides were dieldrin, trans-chlordane, endosulfan I, and chlorpyrifos. Polycyclic aromatic hydrocarbons and polychlorinated biphenyls were also detected. For each s ling day, the relative contribution of PM from regional New Zealand versus long-range Australian sources was determined using trace element profiles and a binary mixing model. The PM approach indicated that endosulfan I, indeno[1,2,3-c,d]pyrene, and benzo[g,h,i]perylene found at Temple Basin were largely of Australian origin. Local wind observations indicated that the chlorpyrifos found at Temple Basin primarily came from the Canterbury Plains in New Zealand.
Inheritance of early Archaean Pb-isotope variability from long-lived Hadean protocrust
Publisher: Springer Science and Business Media LLC
Date: 07-01-2003
Arctic Bay Formation, Borden Basin, Nunavut (Canada): Basin evolution, black shale, and dissolved metal systematics in the Mesoproterozoic ocean
Publisher: Elsevier BV
Date: 07-2012
The Flin Flon paleosol revisited
Publisher: Canadian Science Publishing
Date: 12-2013
Abstract: A ca. 1.85 Ga paleosol developed on seafloor-altered mafic rocks is preserved beneath continental sandstones and conglomerates of the Missi Group near Flin Flon, Manitoba. Previous work has focused on a locality where the paleosol is developed on pillowed greenstone (chlorite + albite + epidote + calcite + quartz + Fe–Ti oxides ± mica). This area has been revisited and a new (∼5 m) profile was excavated and s led at a very high density for geochemical (major element ∼60 s les) and mineralogical (petrography, X-ray diffraction) investigation. The high s ling density has revealed a relatively sharp immobile-element offset (e.g., Al/Ti) in the profile. This could reflect weathering across two separate parent rocks or preferential addition of allochthonous material into the top of the profile. Regardless, comparison with a wide suite of volcanic rocks in the stratigraphy suggests that the original concentration of Fe and probably also Ca and Mg in the greenstone on either side of the boundary was similar, permitting quantitative treatment of major-element trends. The profile shows pronounced upward loss of Ca, Mg, Mn 2+ , and Fe 2+ and a corresponding increase in Al, Ti, and total Fe. Physical weathering features, such as corestones, are well preserved and show progressive alteration upwards in the profile in parallel with the chemical trends. Deep in the profile, Na and Ca are lower than the greenstone due to the weathering of albite and epidote, whereas Mg, Fe, and Mn were largely retained in chlorite and secondary dolomite. Upwards in the profile, the loss of chlorite and dolomite and the increase of illite – mixed-layer clays and white mica (probably 2:1 layer or mixed-layer clays originally) and hematite are accompanied by a transition from green to maroon colour. Above a well-defined depth in the profile, carbonate is virtually absent, and the paleosol is highly depleted in Ca. This transition in the paleosol coincides with the immobile-element offset. The significance of this coincidence remains to be explored. Reworking of regolith (e.g., rip-up clasts) occurred during deposition of the Missi sediments, and burial and subsequent metamorphism resulted in the upward enrichment of K and Na and the associated conversion of pedogenic clays to illite and micas (muscovite and paragonite). Crosscutting quartz and epidote veins and tourmaline formation near the unconformity contact implies minor post-burial fluid movement. Despite these complexities, there is consistent retention of Fe through formation of pedogenic Fe oxides, attested by the near-constant ∑Fe/Al ratio in the profile. There is very little evidence for subsequent Fe reduction by hydrothermal or organic fluids. Instead, trends in the Fe speciation are controlled predominantly by the modal variation of Fe–Ti oxides in the greenstone and spheroidal weathering textures in the paleosol.
Long-range dust transport from eastern Australia: A proxy for Holocene aridity and ENSO-type climate variability
Publisher: Elsevier BV
Date: 30-05-2009
In situ trace metal analysis of N eoarchaean – O rdovician shallow‐marine microbial‐carbonate‐hosted pyrites
Publisher: Wiley
Date: 27-04-2015
DOI: 10.1111/GBI.12139
Abstract: Pre-Cambrian atmospheric and oceanic redox evolutions are expressed in the inventory of redox-sensitive trace metals in marine sedimentary rocks. Most of the currently available information was derived from deep-water sedimentary rocks (black shale/banded iron formation). Many of the studied trace metals (e.g. Mo, U, Ni and Co) are sensitive to the composition of the exposed land surface and prevailing weathering style, and their oceanic inventory ultimately depends on the terrestrial flux. The validity of claims for increased/decreased terrestrial fluxes has remained untested as far as the shallow-marine environment is concerned. Here, the first systematic study of trace metal inventories of the shallow-marine environment by analysis of microbial carbonate-hosted pyrite, from ca. 2.65-0.52 Ga, is presented. A petrographic survey revealed a first-order difference in preservation of early diagenetic pyrite. Microbial carbonates formed before the 2.4 Ga great oxygenation event (GOE) are much richer in pyrite and contain pyrite grains of greater morphological variability but lesser chemical substitution than s les deposited after the GOE. This disparity in pyrite abundance and morphology is mirrored by the qualitative degree of preservation of organic matter (largely as kerogen). Thus, it seems that in microbial carbonates, pyrite formation and preservation were related to presence and preservation of organic C. Several redox-sensitive trace metals show interpretable temporal trends supporting earlier proposals derived from deep-water sedimentary rocks. Most notably, the shallow-water pyrite confirms a rise in the oceanic Mo inventory across the pre-Cambrian-Cambrian boundary, implying the establishment of efficient deep-ocean ventilation. The carbonate-hosted pyrite also confirms the Neoarchaean and early Palaeoproterozoic ocean had higher Ni concentration, which can now more firmly be attributed to a greater proportion of magnesian volcanic rock on land rather than a stronger hydrothermal flux of Ni. Additionally, systematic trends are reported for Co, As, and Zn, relating to terrestrial flux and oceanic productivity.
On the track of a Scottish impact structure: a detrital zircon and apatite provenance study of the Stac Fada Member and wider Stoer Group, NW Scotland
Publisher: Cambridge University Press (CUP)
Date: 24-04-2019
DOI: 10.1017/S0016756819000220
Abstract: The Stac Fada Member of the Stoer Group, within the Torridonian succession of NW Scotland, is a melt-rich, impact-related deposit that has not been conclusively correlated with any known impact structure. However, a gravity low approximately 50 km east of the preserved Stac Fada Member outcrops has recently been proposed as the associated impact site. We investigate the location of the impact structure through a provenance study of detrital zircon and apatite in five s les from the Stoer Group. Our zircon U–Pb data are dominated by Archaean grains ( 2.5 Ga), consistent with earlier interpretations that the detritus was largely derived from local Lewisian Gneiss Complex, whereas the apatite data (the first for the Stoer Group) display a single major peak at c. 1.7 Ga, consistent with regional Laxfordian metamorphism. The almost complete absence of Archaean-aged apatite is best explained by later heating of the 2.5 Ga Lewisian basement (the likely source region) above the closure temperature of the apatite U–Pb system ( c. 375–450°C). The U–Pb age distributions for zircon and apatite show no significant variation with stratigraphic height. This may be interpreted as evidence that there was no major change in provenance during the course of deposition of the Stoer Group or, if there was any significant change, the different source regions were characterized by similar apatite and zircon U–Pb age populations. Consequently, the new data do not provide independent constraints on the location of the structure associated with the Stac Fada Member impact event.
Holocene dust deposition rates in Australia’s Murray-Darling Basin record the interplay between aridity and the position of the mid-latitude westerlies
Publisher: Elsevier BV
Date: 11-2011
Horizontal accretion and stabilization of the Archean Zimbabwe Craton: Comments and Replies
Publisher: Geological Society of America
Date: 1998
Rocks from the Mantle Transition Zone: Majorite-Bearing Xenoliths from Malaita, Southwest Pacific
Publisher: American Association for the Advancement of Science (AAAS)
Date: 19-05-2000
DOI: 10.1126/SCIENCE.288.5469.1215
Abstract: Rocks containing high-pressure mineral assemblages derived from the mantle transition zone between depths of about 400 and 670 kilometers occur as xenoliths and megacrysts on the island of Malaita in the southwest Pacific on the Ontong Java Plateau. Observed ultrahigh pressure mineral chemistries include majorite, calcium- and magnesium-perovskite, aluminous silicate phases, and microdiamond. Based on an empirical barometer, majoritic garnets in these xenoliths record pressures of up to 22 gigapascal. The occurrence of material with perovskite chemistry and several enigmatic aluminous phases indicates pressures of up to 27 gigapascal. S les were brought to the surface at about 34 million years ago by potassic ultramafic magmas, which evidently originated in the lower mantle.
Comment on “the Nd and Hf isotopic evolution of the mantle through the Archean: Results from the Isua supracrustals, West Greenland, and from the birimian terranes of West Africa” by Blichert-Toft et
Publisher: Elsevier BV
Date: 06-2001
Direct quantification of rare earth element concentrations in natural waters by ICP-MS
Publisher: Elsevier BV
Date: 05-2006
Depth-dependent peridotite-melt interaction and the origin of variable silica in the cratonic mantle
Publisher: Springer Science and Business Media LLC
Date: 17-02-2021
DOI: 10.1038/S41467-021-21343-9
Abstract: Peridotites from the thick roots of Archaean cratons are known for their compositional ersity, whose origin remains debated. We report thermodynamic modelling results for reactions between peridotite and ascending mantle melts. Reaction between highly magnesian melt (komatiite) and peridotite leads to orthopyroxene crystallisation, yielding silica-rich harzburgite. By contrast, shallow basalt-peridotite reaction leads to olivine enrichment, producing magnesium-rich dunites that cannot be generated by simple melting. Komatiite is spatially and temporally associated with basalt within Archaean terranes indicating that modest-degree melting co-existed with advanced melting. We envisage a relatively cool mantle that experienced episodic hot upwellings, the two settings could have coexisted if roots of nascent cratons became locally strongly extended. Alternatively, deep refractory silica-rich residues could have been detached from shallower dunitic lithosphere prior to cratonic amalgamation. Regardless, the distinct Archaean melting-reaction environments collectively produced skewed and multi-modal olivine distributions in the cratonic lithosphere and bimodal mafic-ultramafic volcanism at surface.
Micro‐scale sulphur isotope evidence for sulphur cycling in the late Archean shallow ocean
Publisher: Wiley
Date: 21-12-2006
DOI: 10.1111/J.1472-4669.2006.00091.X
Abstract: We report in situ secondary ion mass spectrometer sulphur isotope data for sedimentary pyrite from the 2.52 Ga Upper C bellrand Subgroup, Transvaal, South Africa. The analysed sedimentary rocks represent a transition in depositional environment from very shallow to deeper water, with strong sedimentological, facies distribution and geochemical evidence for the presence of a shallow redox chemocline. Data were obtained directly in thin section in order to preserve petrographic context. They reveal a very large extent of isotopic fractionation both in mass‐independent (MIF) and in mass‐dependent fractionation (MDF) on unprecedentedly small scale. In the shallow‐water microbical carbonates, three types of pyrite were identified. The texturally oldest pyrite is found as small, isotopically little fractionated grains in the microbial mats. Large (several mm) spheroidal pyrite concretions, which postdate the mat pyrite, record strong evidence for an origin by bacterial sulphate reduction. Rare pyrite surrounding late fenestral calcite is inferred to have formed from recycled bacterial pyrite on account of the slope of its correlated MIF and MDF array. This latter type of pyrite was also found in an interbedded black shale and a carbonate laminite. In a deeper water chert, pyrite with very heavy sulphur indicates partial to almost complete sulphate reduction across a chemocline whose existence has been inferred independently. The combined picture from all the studied s les is that of a sulphate availability‐limited environment, in which sulphur was cycled between reservoirs according to changing redox conditions established across the chemocline. Cycling apparently reduced the extent of recorded sulphur isotope fractionation relative to what is expected from projection in the correlated MIF and MDF arrays. This is consistent with regionally relatively high free oxygen concentrations in the shallow water, permitting locally strong MDF. Our new observations add to the growing evidence for a complex, fluctuating evolution of free atmospheric oxygen between c . 2.7 Ga and 2.3 Ga.
Chemical characterization of earth’s most ancient clastic metasediments from the Isua Greenstone Belt, southern West Greenland
Publisher: Elsevier BV
Date: 03-2005
Quantitative Data Extraction from Orthopyroxene Trace Element Maps and Its Potential to Examine the Formation of the UG2 Unit, Bushveld Complex
Publisher: MDPI AG
Date: 27-01-2019
DOI: 10.3390/MIN9020073
Abstract: We present a mineral chemical stratigraphy across the UG2 Unit, situated in the Upper Critical Zone of the Bushveld Complex. The magmatic evolution of the rocks hosting this world-class ore deposit for chromium and platinum group elements (PGEs) is still under debate. Orthopyroxene is a common phase across the magmatic stratigraphy of the unit. It hosts trace metals, whose relative contents can record information about magmatic processes. This study determined laser ablation inductively-coupled plasma mass spectrometry (LA-ICP-MS) trace element data for orthopyroxene and spot LA multi-collector ICP-MS Sr-isotope data for plagioclase. Mapping of trace element distributions revealed internal zoning in Cr, V, Y, and Th. Unlike in conventional spot analysis, quantitative trace element concentrations were extracted post-analysis from two-dimensional LA-ICP-MS maps. This approach offered advantages over spot analysis. The maps revealed internal complexities (e.g., inclusions, exsolved phases, zonations and diffusion halos) that could be avoided with suitable thresholds for chemical filter elements (i.e., 100 ppm Cr 4000 ppm, Y 6 ppm), permitting fast, automated extraction of pure orthopyroxene data pixels from elemental maps covering noritic, troctolitic, anorthositic and chromititic mineral assemblages. Diffusive equilibration in orthopyroxene was evaluated by comparing zonations in elements with different known diffusivities. Magnesium and Ni are homogenously distributed, indicative of rapid diffusive processes, while Cr and V show zonations, interpreted to largely reflect primary distribution. Thorium and Y apparently diffused along discrete pathways, indicated by concentration anomalies following orthopyroxene lamellae. A systematic study of the trace element inventory of orthopyroxene across the succession of the UG2 Unit, complemented with Sr isotope signatures of plagioclase, revealed clear evidence for open-system processes: compatible elements (Cr, Ni) are decoupled from Mg# variations in orthopyroxene from specific UG2 subunits distinct Mg# peaks coincide with negative V excursions in orthopyroxene from chromite-bearing subunits towards the top of the unit, plagioclase shows a distinct 87Sr/86Srinitial peak and orthopyroxene shows Cr-depleted and Th-enriched rims. These chemical features cannot be explained by crystal mixing alone and argue for the involvement of at least two chemically distinct melts in the formation of the studied UG2 section.
Evidence for highly depleted lower continental crust using an integrated microanalytical reconstitution approach
Publisher: Oxford University Press (OUP)
Date: 30-07-2021
Isotopic and chemical fractionations caused by disk winds in the protoplanetary disk
Publisher: Wiley
Date: 20-07-2016
DOI: 10.1111/MAPS.12704
Goldschmidt Abstracts 2010 – H
Publisher: Elsevier BV
Date: 06-2010
Goldschmidt Abstracts 2008- U
Publisher: Elsevier BV
Date: 07-2008
Chemical Abrasion Applied to LA-ICP-MS U–Pb Zircon Geochronology
Publisher: MDPI AG
Date: 03-06-2014
DOI: 10.3390/MIN4020503
Stromatolite reef from the Early Archaean era of Australia
Publisher: Springer Science and Business Media LLC
Date: 06-2006
DOI: 10.1038/NATURE04764
Abstract: The 3,430-million-year-old Strelley Pool Chert (SPC) (Pilbara Craton, Australia) is a sedimentary rock formation containing laminated structures of probable biological origin (stromatolites). Determining the biogenicity of such ancient fossils is the subject of ongoing debate. However, many obstacles to interpretation of the fossils are overcome in the SPC because of the broad extent, excellent preservation and morphological variety of its stromatolitic outcrops--which provide comprehensive palaeontological information on a scale exceeding other rocks of such age. Here we present a multi-kilometre-scale palaeontological and palaeoenvironmental study of the SPC, in which we identify seven stromatolite morphotypes--many previously undiscovered--in different parts of a peritidal carbonate platform. We undertake the first morphotype-specific analysis of the structures within their palaeoenvironment and refute contemporary abiogenic hypotheses for their formation. Finally, we argue that the ersity, complexity and environmental associations of the stromatolites describe patterns that--in similar settings throughout Earth's history--reflect the presence of organisms.
LA-ICP-MS elemental mapping of pyrite: An application to the Palaeoproterozoic atmosphere
Publisher: Elsevier BV
Date: 08-2017
Dating synmagmatic folds: a case study of Schlingen structures in the Strona‐Ceneri Zone (Southern Alps, northern Italy)
Publisher: Wiley
Date: 05-1998
Geochemistry and Secular Geochemical Evolution of the Earth's Mantle and Lower Crust
Publisher: Wiley
Date: 18-03-2011
Archaean granulites of the Limpopo Belt, Zimbabwe: One slow exhumation or two rapid events?
Publisher: American Geophysical Union (AGU)
Date: 12-1996
DOI: 10.1029/96TC00850
The role of pedogenesis and natural fertiliser as vectors for essential metal content in agricultural topsoils, Central India
Publisher: Springer Science and Business Media LLC
Date: 2021
DOI: 10.1007/S42452-020-03982-7
Abstract: Essential trace metals are well known for their environmental toxicity and for being part of complex bio-chemical cycles. Their role as critical micronutrients, delivering vital health benefits, is less widely discussed and understood, holding back strategies for combatting malnutrition. Crops grown on many Indian soils suffer from deficiencies in essential metals, notably iron (Fe), zinc (Zn), and molybdenum (Mo). The list of deficient metals will likely grow due to increasing future crop demand. Geostatistical analysis of soils and farmyard manure (FYM), the predominant fertiliser, implies that residual oxide minerals carry high concentrations of the essential trace metals Fe, Zn, copper (Cu), chromium (Cr), nickel (Ni), cobalt (Co), manganese (Mn) not only in soil but also in FYM (especially Fe, Cr, Cu, Co and Ni). A geochemical survey across a road traverse of 600 km, encompassing an area of c. 15,000 km 2 , was conducted in Central India to evaluate reported essential metal deficiency in key agricultural topsoils. Importantly, our evaluation of the element cycling in this system reveals that despite high bulk concentrations, some key metals remain bio-unavailable. In effect, the existence of refractory (weathering-resistant) oxides is likely a significant factor for deficiency symptoms in the soil–plant-fertiliser cycle. Further, mass balance calculations of the bioavailable pool of metals imply that only Fe and Mn are present in sufficient quantities to combat deficiency problems. Notwithstanding this limitation of FYM, its high organic carbon content, as well as its importance for Zn, Cu and Fe, validates its traditional use to maintain the fertility and physical condition of Indian topsoils.
Theme 6: The early earth and planets
Publisher: Elsevier BV
Date: 06-2004
Majoritic garnet: A new approach to pressure estimation of shock events in meteorites and the encapsulation of sub-lithospheric inclusions in diamond
Publisher: Elsevier BV
Date: 10-2010
Evolution of the Continents and the Atmosphere Inferred from Th-U-Nb Systematics of the Depleted Mantle
Publisher: American Association for the Advancement of Science (AAAS)
Date: 05-03-1999
DOI: 10.1126/SCIENCE.283.5407.1519
Abstract: Temporal evolution of depleted mantle thorium-uranium-niobium systematics constrain the amount of continental crust present through Earth's history (through the niobium/thorium ratio) and date formation of a globally oxidizing atmosphere and hydrosphere at approximately 2.0 billion years ago (through the niobium/uranium ratio). Increase in the niobium/thorium ratio shows involvement of hydrated lithosphere in differentiation of Earth since approximately 3.8 billion years ago. After approximately 2.0 billion years ago, the decreasing mantle thorium/uranium ratio portrays mainly preferential recycling of uranium in an oxidizing atmosphere and hydrosphere. Net growth rate of continental crust has varied over time, and continents are still growing today.
The rare earth element signal in Archaean microbial carbonate: information on ocean redox and biogenicity
Publisher: Geological Society of London
Date: 17-09-2014
DOI: 10.1144/JGS2013-110
Laser Ablation-Inductively Coupled Plasma Mass Spectrometry (LA-ICPMS) elemental mapping and its applications in ore geology
Publisher: Chinese Society for Mineralogy, Petrology, and Geochemistry
Date: 2019
Goldschmidt Abstracts 2010 – K
Publisher: Elsevier BV
Date: 06-2010
Trace elements and metal pollution in aerosols at an alpine site, New Zealand: Sources, concentrations and implications
Publisher: Elsevier BV
Date: 2014
New feldspar lead isotope and trace element evidence from the sudbury igneous complex indicate a complex origin of associated Ni-Cu-PGE mineralization involving underlying country rocks
Publisher: Society of Economic Geologists
Date: 03-03-2017
Goldschmidt Abstracts 2008- G
Publisher: Elsevier BV
Date: 07-2008
Goldschmidt Abstracts 2008- M
Publisher: Elsevier BV
Date: 07-2008
Goldschmidt Abstracts 2008- K
Publisher: Elsevier BV
Date: 07-2008
The distribution of precious and energy critical metals at the scale of a copper deposit
Publisher: Informa UK Limited
Date: 03-04-2017
Deep-water seep-related carbonate mounds in a Mesoproterozoic alkaline lake, Borden Basin (Nunavut, Canada)
Publisher: Elsevier BV
Date: 12-2015
U–Pb LA–ICPMS dating using accessory mineral standards with variable common Pb
Publisher: Elsevier BV
Date: 2014
Combined zinc-lead isotope and trace-metal assessment of recent atmospheric pollution sources recorded in Irish peatlands
Publisher: Elsevier BV
Date: 03-2019
DOI: 10.1016/J.SCITOTENV.2018.12.049
Abstract: Atmospherically-fed Earth surface archives such as ombrotrophic peatlands, lake sediments, and ice consistently show an upward increase in Zn concentrations of hitherto unclear origin. Here, we present a combined stable Zn isotope and trace element (Zn, Cd, Ni, Cu, Cr, V, Ta, Pb) dataset for a historically polluted, near-urban bog (Liffey Head) from the east coast of Ireland. This peat record is compared to an archive from a rural site at the west coast of Ireland (Brackloon Wood). Both archives show a clear near-surface increase in Zn deposition, accompanied by periodic deposition in Cr, Ni, Mo, and V suggesting a co-genetic origin of these elements. In the Liffey Head site, biologic upward distillation of nutrients can be excluded as the origin of the elemental enrichments. The differences in the excess metal ratios between the two sites (e.g., Zn/Cd of 426-1564, east, and 77-106, west) are attributed to a higher contribution from traffic emissions (diesel, petrol) and oil-burning at the near-urban site, and dominant atmospheric influence from solid fossil fuel combustion emissions (e.g., mixed fuel, coal and wood) at the rural site. The Zn isotope composition in the historically-polluted Liffey Head bog evolved from δ
On the overabundance of light rare earth elements in terrestrial zircons and its implication for Earth’s earliest magmatic differentiation
Publisher: Elsevier BV
Date: 12-2002
Rare earth element geochemistry of Late Devonian reefal carbonates, Canning Basin, Western Australia: Confirmation of a seawater REE proxy in ancient limestones
Publisher: Elsevier BV
Date: 2004
The behaviour of the rare earth elements during estuarine mixing—revisited
Publisher: Elsevier BV
Date: 06-2006
Rare earth elements in Holocene reefal microbialites: a new shallow seawater proxy
Publisher: Elsevier BV
Date: 05-2000
Hf isotope evidence for effective impact melt homogenisation at the Sudbury impact crater, Ontario, Canada
Publisher: Elsevier BV
Date: 10-2017
Rare Earth Element Determination in Olivine by Laser Ablation‐Quadrupole‐ICP ‐MS : An Analytical Strategy and Applications
Publisher: Wiley
Date: 21-12-2016
DOI: 10.1111/GGR.12157
Reconstructing annual inflows to the headwater catchments of the Murray River, Australia, using the Pacific Decadal Oscillation
Publisher: American Geophysical Union (AGU)
Date: 03-2009
DOI: 10.1029/2008GL037049
The Triangle Shearzone, Zimbabwe, revisited: new data document an important event at 2.0 Ga in the Limpopo Belt
Publisher: Elsevier BV
Date: 1995
A rare earth element study of complex zircons from early Archaean Amı̂tsoq gneisses, Godthåbsfjord, south-west Greenland
Publisher: Elsevier BV
Date: 10-2003
Fluid-mobile trace element constraints on the role of slab melting and implications for Archaean crustal growth models
Publisher: Springer Science and Business Media LLC
Date: 10-2002
Linking granulites, intraplate magmatism, and bi-mineralic eclogites with a thermodynamic-petrological model of melt-solid interaction at the base of anorogenic lower continental crust
Publisher: Elsevier BV
Date: 09-2022
Uranium–lead zircon systematics in the Sudbury impact crater-fill: implications for target lithologies and crater evolution
Publisher: Geological Society of London
Date: 27-10-2015
DOI: 10.1144/JGS2014-056
Initial Pb of the Amı̂tsoq gneiss revisited: implication for the timing of early Archaean crustal evolution in West Greenland
Publisher: Elsevier BV
Date: 08-1998
Pervasively anoxic surface conditions at the onset of the Great Oxidation Event: New multi-proxy constraints from the Cooper Lake paleosol
Publisher: Elsevier BV
Date: 04-2019
Petrology and Geochemistry of Early Cretaceous Bimodal Continental Flood Volcanism of the NW Etendeka, Namibia. Part 1: Introduction, Mafic Lavas and Re-evaluation of Mantle Source Components
Publisher: Oxford University Press (OUP)
Date: 2004
Petrology and Geochemistry of Early Cretaceous Bimodal Continental Flood Volcanism of the NW Etendeka, Namibia. Part 2: Characteristics and Petrogenesis of the High-Ti Latite and High-Ti and Low-Ti Vo
Publisher: Oxford University Press (OUP)
Date: 2004
Mo isotopic composition of the mid-Neoproterozoic ocean: An iron formation perspective
Publisher: Elsevier BV
Date: 06-2013
Integrated Pb- and S-isotope investigation of sulphide minerals from the early Archaean of southwest Greenland
Publisher: Elsevier BV
Date: 10-2005
A new depositional model for glaciogenic Neoproterozoic iron formation: insights from the chemostratigraphy and basin configuration of the Rapitan iron formation1Northwest Territories Geosc
Publisher: Canadian Science Publishing
Date: 02-2012
DOI: 10.1139/E11-066
Abstract: Neoproterozoic iron formations record an unusual and apparently final recurrence of this sediment type after a hiatus of more than one billion years. Despite the unusual environmental conditions that led to their formation, specifically their association with glaciogenic deposits, Neoproterozoic iron formations have strongly influenced models for the Precambrian Earth’s surficial evolution and iron formation in general. A suite of high-quality trace element data for 42 s les from the Rapitan iron formation in northwestern Canada were used to reconstruct the configuration and redox evolution of the Rapitan Basin. Complete rare-earth element and yttrium (REE+Y) patterns demonstrate that the Rapitan Basin was hydrologically connected to the open ocean, but that local catchments of an evolved, possibly granitic composition supplied dissolved REE+Y, suggesting partial basin restriction. Molybdenum and U systematics are consistent and indicate a partly restricted, or “silled” basin. In contrast to modern analogues for such basins, such as the Cariaco Basin, the stratigraphic association with glaciogenic clastic rocks requires ice cover to be considered in basin reconstruction. Accordingly, the Rapitan iron formation was deposited through a complex interplay of processes: during intervals of ice cover, glacially sourced iron oxyhydroxides were bacterially reduced to dissolved ferrous iron, which was subsequently oxidized to ferric iron following ice withdrawal. During this time, extreme primary productivity in the shallow water column drove eutrophication at middle water depths and the production of a three-tiered stratified water column with ferruginous deep water, a thin euxinic wedge at middle depths, and oxic surface water. Regardless of the basinal redox conditions and depositional constraints, the absence of a positive Eu anomaly in the Rapitan iron formation suggests that the global ocean was fully oxygenated by the Neoproterozoic.
Pitfalls and new approaches in granulite chronometry
Publisher: Elsevier BV
Date: 08-1998
A Reconstitution Approach for Whole Rock Major and Trace Element Compositions of Granulites from the Kapuskasing Structural Zone
Publisher: MDPI AG
Date: 25-06-2020
DOI: 10.3390/MIN10060573
Abstract: Current estimates for the composition of the lower continental crust show significant variation for the concentrations of the highly incompatible elements, including large uncertainties for the heat-producing elements. This has consequences for models of the formation of lower crust. For ex le, is lower continental crust inherently poor in incompatible elements or has it become so after extraction of partial melts caused by thermal incubation? Answering these questions will require better agreement between estimates for the chemistry of the lower crust. One issue is that granulite s les may have been altered during ascent. Xenoliths often experience contamination from the entraining alkaline magma, potentially resulting in elevated concentrations of incompatible trace elements when analysed by conventional bulk rock techniques. To avoid this, we assessed an in situ approach for reconstructing whole rock compositions with granulites from the Kapuskasing Structural Zone, Superior Province, Canada. As terrain s les, they have not been affected by host magma contamination, and as subrecent glacial exposures, they show minimal modern weathering. We used scanning electron microscope electron dispersive spectroscopy (SEM-EDS) phase mapping to establish the modal mineralogy. Major and trace element concentrations of mineral phases were determined by electron microprobe and laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS), respectively. These concentrations were combined with the modal mineralogies to obtain reconstructed whole rock compositions, which were compared to conventional bulk rock analyses. The reconstructed data show good reproducibility relative to the conventional analyses for s les with massive textures. However, the conventional bulk rock chemistry systematically yields higher K concentrations, which are hosted in altered feldspars. Thus, even in terrain s les, minor alteration can lead to elevated incompatible element estimates that may not represent genuine lower continental crust.
Long-Term Observations of Isotope Ratio Accuracy and Reproducibility Using Quadrupole ICP-MS
Publisher: Wiley
Date: 06-2010
A new estimate for the composition of weathered young upper continental crust from alluvial sediments, Queensland, Australia
Publisher: Elsevier BV
Date: 02-2005
Scavenging of atmospheric trace metal pollutants by mineral dusts: Inter-regional transport of Australian trace metal pollution to New Zealand
Publisher: Elsevier BV
Date: 03-2008
Revisiting the Happy Jack Uraninite Reference Material: A Combined Electron Beam and Laser Ablation In Situ Study
Publisher: Wiley
Date: 13-10-2022
DOI: 10.1111/GGR.12457
Abstract: This new comprehensive in situ mineral‐chemical characterisation of the Happy Jack uraninite has discovered additional information regarding matrix effects and trace element homogeneity, relevant to proposals that it could serve as a reference material (RM). On the LA‐ICP‐MS instrumentation used, there was an absence of discernible matrix effects relative to the silicate glass NIST SRM 610. Lanthanides and Y are found to be very homogeneously distributed in Happy Jack uraninite, Zr, Nb and Ti mass fractions reproducible but only within in idual fragments, and other elements still generally heterogeneous. This means that the Happy Jack uraninite can serve as a secondary RM for quality control in studies of natural uraninites. In terms of absolute accuracy and intermediate measurement precision, the Happy Jack uraninite can be used for the homogeneous elements. For elements that are homogeneous within in idual fragments only, intermediate measurement precision can still be evaluated, while information values will be obtained for the generally heterogeneous elements. Two distinct groups (high vs. low Zr) were distinguished to exist among different Happy Jack fragments in association with minor variation of REE mass fractions, which possibly explains the observed (heavy) REE discrepancy between in situ laser ablation and bulk solution ICP‐MS analyses.
Trace element and Pb isotope fingerprinting of atmospheric pollution sources: A case study from the east coast of Ireland
Publisher: Elsevier BV
Date: 09-2018
Characterisation of early Archaean chemical sediments by trace element signatures
Publisher: Elsevier BV
Date: 05-2004
Origin of ocean island basalts: A new model based on lead and helium isotope systematics
Publisher: American Geophysical Union (AGU)
Date: 10-11-1999
DOI: 10.1029/1999JB000258
Effect of salinity on the skeletal chemistry of cultured scleractinian zooxanthellate corals: Cd/Ca ratio as a potential proxy for salinity reconstruction
Publisher: Springer Science and Business Media LLC
Date: 19-11-2013
Corrigendum to “The behaviour of the rare earth elements during estuarine mixing—revisited” [Marine Chemistry 100 (2006) 147–161]
Publisher: Elsevier BV
Date: 04-2007
Age significance of U–Th–Pb zircon data from early Archaean rocks of west Greenland—a reassessment based on combined ion-microprobe and imaging studies
Publisher: Elsevier BV
Date: 08-1999
Rare earth element partitioning and subsolidus exchange behaviour in olivine
Publisher: Elsevier BV
Date: 12-2017
The iron isotope composition of microbial carbonate
Publisher: Elsevier BV
Date: 03-2008
Tungsten isotope evidence from ∼3.8-Gyr metamorphosed sediments for early meteorite bombardment of the Earth
Publisher: Springer Science and Business Media LLC
Date: 07-2002
DOI: 10.1038/NATURE00923
Simultaneous determination of δ33SV‐CDT and δ34SV‐CDT using masses 48, 49 and 50 on a continuous flow isotope ratio mass spectrometer
Publisher: Wiley
Date: 21-10-2004
DOI: 10.1002/RCM.1681
Abstract: A new, fast, continuous flow technique is described for the simultaneous determination of delta33S and delta34S using SO masses 48, 49 and 50. Analysis time is approximately 5 min/s le with measurement precision and accuracy better than +/-0.3 per thousand. This technique, which has been set up using IAEA Ag2S standards S-1, S-2 and S-3, allows for the fast determination of mass-dependent or mass-independent fractionation (MIF) effects in sulfide, organic sulfur s les and possibly sulfate. Small s le sizes can be analysed directly, without chemical pre-treatment. Robustness of the technique for natural versus artificial standards was demonstrated by analysis of a Canon Diablo troilite, which gave a delta33S of 0.04 per thousand and a delta34S of -0.06 per thousand compared to the values obtained for S-1 of 0.07 per thousand and -0.20 per thousand, respectively. Two pyrite s les from a banded-iron formation from the 3710 Ma Isua Greenstone Belt were analysed using this technique and yielded MIF (Delta33S of 2.45 and 3.31 per thousand) comparable to pyrite previously analysed by secondary ion probe.
Prioritising topics for developing e-learning resources in healthcare curricula: A comparison between students and educators using a modified Delphi survey
Publisher: Public Library of Science (PLoS)
Date: 24-06-2021
DOI: 10.1371/JOURNAL.PONE.0253471
Abstract: Engaging students in the e-learning development process enhances the effective implementation of e-learning, however, students’ priority on the topics for e-learning may differ from that of the educators. This study aims to compare the differences between the students and their educators in prioritising the topics in three healthcare curricula for reusable e-learning object (RLO) development. A modified Delphi study was conducted among students and educators from University Malaya (UM), Universiti Putra Malaysia (UPM) and Taylor’s University (TU) on three undergraduate programmes. In Round 1, participants were asked to select the topics from the respective syllabi to be developed into RLOs. Priority ranking was determined by using frequencies and proportions. The first quartile of the prioritised topics was included in Round 2 survey, which the participants were asked to rate the level of priority of each topic using a 5-point Likert scale. The mean score of the topics was compared between students and educators. A total of 43 educators and 377 students participated in this study. For UM and TU Pharmacy, there was a mismatch in the prioritised topics between the students and educators. For UPM, both the educators and students have prioritised the same topics in both rounds. To harmonise the prioritisation of topics between students and educators for UM and TU Pharmacy, the topics with a higher mean score by both the students and educators were prioritised. The mismatch in prioritised topics between students and educators uncovered factors that might influence the prioritisation process. This study highlighted the importance of conducting needs assessment at the beginning of eLearning resources development.
Assigning Dates to Thin Gneissic Veins in High-Grade Metamorphic Terranes: A Cautionary Tale from Akilia, Southwest Greenland
Publisher: Oxford University Press (OUP)
Date: 14-10-2004
Th/U and U series systematics of saprolite: importance for the oceanic 234U excess
Publisher: European Association of Geochemistry
Date: 02-2018
Rare Earth Element Concentrations in the Natural Water Reference Materials (NRCC) NASS-5, CASS-4 and SLEW-3
Publisher: Wiley
Date: 06-2007
Westward continuation of the craton–Limpopo Belt tectonic break in Zimbabwe and new age constraints on the timing of the thrusting
Publisher: Geological Society of London
Date: 02-1995
A new approach to laser-ablation inductively-coupled-plasma mass-spectrometry (LA-ICP-MS) using the flexible map interrogation tool ‘Monocle’
Publisher: Elsevier BV
Date: 07-2017
Archean cherts in banded iron formation: Insight into Neoarchean ocean chemistry and depositional processes
Publisher: Elsevier BV
Date: 09-2012
Aquatic geochemistry of the rare earth elements and yttrium in the Pioneer River catchment, Australia
Publisher: CSIRO Publishing
Date: 2006
DOI: 10.1071/MF05229
Abstract: The rare earth elements are strong provenance indicators in geological materials, yet the potential for tracing provinciality in surface freshwater s les has not been adequately tested. Rare earth element and yttrium concentrations were measured at 33 locations in the Pioneer River catchment, Mackay, central Queensland, Australia. The rare earth element patterns were compared on the basis of geological, topographical and land-use features in order to investigate the provenancing potential of these elements in a small freshwater system. The rare earth element patterns of streams draining single lithological units with minor land modification show strongly coherent normalised behaviour, with a loss of coherence in agricultural locations. Evidence is reported for an anthropogenic Gd anomaly that may provide a useful hydrological tracer in this region since the introduction of magnetic resonance imaging in 2003. Several s les display a superchondritic Y/Ho mass ratio (up to 44), which is not explainable within the constraints imposed by local geology. Instead, it is suggested that the additional Y is derived from a marine source, specifically marine phosphorites, which are a typical source of fertiliser phosphorus. The data indicate that, under some circumstances, scaled and normalised freshwater rare earth patterns behave conservatively.
Single mineral dating by the PbPb step-leaching method: Assessing the mechanisms
Publisher: Elsevier BV
Date: 1997
Trace elements record depositional history of an Early Archean stromatolitic carbonate platform
Publisher: Elsevier BV
Date: 02-2010
Significance of the longevity of the marine rare earth pattern
Publisher: Elsevier BV
Date: 08-2006
High-resolution lake sediment reconstruction of industrial impact in a world-class mining and smelting center, Sudbury, Ontario, Canada
Publisher: Elsevier BV
Date: 10-2013
Isotopic peculiarities of an Archaean pegmatite (Union Mine, Mica, South Africa):
Publisher: Elsevier BV
Date: 08-1998
Metal(loid) Deportment in Sulfides from the High-Grade Core of the Bingham Canyon Porphyry Cu-Mo-Au Deposit, Utah
Publisher: Society of Economic Geologists, Inc.
Date: 11-2022
DOI: 10.5382/ECONGEO.4954
Abstract: Porphyry deposits supply the bulk of the world’s Cu and Mo and significant amounts of Au, as well as other minor and trace metal(loid)s, including Ag, Re, Te, Pd, Se, Bi, Zn, and Pb. Porphyry deposits are gaining in importance as a source of critical raw materials with the increasing global demand for these commodities. To date, minor and trace metal(loid)s are still commonly recovered as by-products from porphyry ores without prior characterization of their host mineralogy that could inform more efficient processing and improved recoveries. We report a comprehensive metal(loid) deportment study on a complete vein paragenetic series in s les from the northwestern high-grade zone of the Bingham Canyon Cu-Mo-Au porphyry deposit, Utah. The polyphase Bingham stock comprises an early premineralization equigranular monzonite phase that was intruded by a series of five successive, ore-related porphyry intrusions. Veins with hypogene Cu-(Fe) sulfide assemblages from all five porphyry intrusions were characterized for their trace metal(loid) contents by laser ablation-inductively coupled-mass spectrometry (LA-ICP-MS). It was found that bornite and digenite contain elevated Bi, Ag, Te, and Se relative to chalcopyrite, whereas the latter contains elevated concentrations of Co, Ga, and In. A stepwise decline in sulfide abundance occurs over the porphyry intrusion sequence and is more pronounced in digenite and bornite than in chalcopyrite. The related diminishing concentration per rock volume (inventory) of Bi, Ag, Te, and Se in the youngest porphyry dikes could have been caused in part by a geochemical change in the mineralizing fluid supply across successive intrusive-hydrothermal cycles. Element mapping of exsolved digenite within bornite revealed characterstic partitioning of metal(loid)s between bornite and digenite most notably Ag, but also Te and Au are enriched in digenite relative to enclosing bornite. Bornite domains within these composite grains reveal complex zonation of Sn, In, and Bi, which are attributed to stress-induced diffusion within bornite, resulting from the digenite exsolution process. The selective partitioning of metal(loid)s between bornite and digenite is likely a common feature in many porphyry Cu deposits, given the fundamental mineralogical characteristics of these two sulfides. Our results contribute to an improved understanding of the distribution (from mineral to deposit scale) of critical trace metal(loid)s in porphyry deposits, particularly those containing exsolved digenite. This knowledge can be applied to determine more accurately the value of ore resources, to improve geometallurgical models and by-product recoveries, and to help limit the environmental effects of metal(loid) dispersion.
Growth of subcontinental lithospheric mantle beneath Zimbabwe started at or before 3.8 Ga: Re-Os study on chromites
Publisher: Geological Society of America
Date: 1997
High-precision rare earth element, nickel, and chromium chemistry of chert microbands pre-screened with in-situ analysis
Publisher: Elsevier BV
Date: 06-2011
Transition metal abundances in microbial carbonate: a pilot study based on in situ LA‐ICP‐MS analysis
Publisher: Wiley
Date: 10-10-2007
Comment on “Variability of Nb/U and Th/La in 3.0 to 2.7 Ga Superior Province ocean plateau basalts: implications for the timing of continental growth and lithosphere recycling”
Publisher: Elsevier BV
Date: 30-04-2000
Silicon and chromium stable isotopic systematics during basalt weathering and lateritisation: A comparison of variably weathered basalt profiles in the Deccan Traps, India
Publisher: Elsevier BV
Date: 03-2018
A trace element study of siderite-jasper banded iron formation in the 3.45 Ga Warrawoona Group, Pilbara Craton - Formation from hydrothermal fluids and shallow seawater
Publisher: Elsevier BV
Date: 04-2005
Juvenile crust formation in the Zimbabwe Craton deduced from the O-Hf isotopic record of 3.8–3.1 Ga detrital zircons
Publisher: Elsevier BV
Date: 10-2017
Protracted volcanism after large impacts: Evidence from the Sudbury impact basin
Publisher: American Geophysical Union (AGU)
Date: 04-2017
DOI: 10.1002/2016JE005085
Importance of water for Archaean granitoid petrology: a comparative study of TTG and potassic granitoids from Barberton Mountain Land, South Africa
Publisher: Springer Science and Business Media LLC
Date: 06-2003
Rare earth element geochemistry of scleractinian coral skeleton during meteoric diagenesis: A sequence through neomorphism of aragonite to calcite
Publisher: Wiley
Date: 13-07-2009
Micro-scale (SIMS) sulphur isotope evidence for late archean rise in shallow oceanic free oxygen
Publisher: Elsevier BV
Date: 08-2006
A multi-trace element coral record of land-use changes in the Burdekin River catchment, NE Australia
Publisher: Elsevier BV
Date: 04-2007
Trace Element Geochemistry as a Tool for Interpreting Microbialites
Publisher: Springer Netherlands
Date: 29-07-2010
Goldschmidt Abstracts 2009 – B
Publisher: Elsevier BV
Date: 06-2009
Single mineral PbPb dating
Publisher: Elsevier BV
Date: 1995
Earliest Seafloor Hydrothermal Systems on Earth: Comparison with Modern Analogues
Publisher: Springer Netherlands
Date: 29-07-2010
How well can Pb isotopes date core formation?
Publisher: Springer Science and Business Media LLC
Date: 11-2006
DOI: 10.1038/NATURE05359
Abstract: Timescale and the physics of planetary core formation are essential constraints for models of Earth's accretion and early differentiation. Wood and Halliday use the apparent mismatch in core-formation dates determined from tungsten (W) and lead (Pb) chrono-meters to argue for a two-stage core formation, involving an early phase of metal segregation followed by a protracted episode of sulphide melt addition. However, we show here that crust- mantle Pb isotope systematics do not require diachronous core formation. Our observations indicate that very early (< or = 35 Myr) core formation and planet accretion remain the most plausible scenario.
Biosignatures in Ancient Rocks: A Summary of Discussions at a Field Workshop on Biosignatures in Ancient Rocks
Publisher: Mary Ann Liebert Inc
Date: 10-2008
Correction to: Ultra-trace Element Characterization of the Central Ottawa River Basin Using a Rapid, Flexible, and Low-Volume ICP-MS Method
Publisher: Springer Science and Business Media LLC
Date: 28-07-2020
Goldschmidt Abstracts 2009 – K
Publisher: Elsevier BV
Date: 06-2009
Archean mafic–ultramafic volcanic landmasses and their effect on ocean–atmosphere chemistry
Publisher: Elsevier BV
Date: 06-2010
High resolution provenancing of long travelled dust deposited on the Southern Alps, New Zealand
Publisher: Elsevier BV
Date: 07-2005
Atmospheric pollutants in alpine peat bogs record a detailed chronology of industrial and agricultural development on the Australian continent
Publisher: Elsevier BV
Date: 05-2010
DOI: 10.1016/J.ENVPOL.2009.12.009
Abstract: Two peat bogs from remote alpine sites in Australia were found to contain detailed and coherent histories of atmospheric metal pollution for Pb, Zn, Cu, Mo, Ag, As, Cd, Sb, Zn, In, Cr, Ni, Tl and V. Dramatic increases in metal deposition in the post-1850 AD portion of the cores coincide with the onset of mining in Australia. Using both Pb isotopes and metals, pollutants were ascribed to the main atmospheric pollution emitting sources in Australia, namely mining and smelting, coal combustion and agriculture. Results imply mining and metal production are the major source of atmospheric metal pollution, although coal combustion may account for up to 30% of metal pollutants. A novel finding of this study is the increase in the otherwise near-constant Y/Ho ratio after 1900 AD. We link this change to widespread and increased application of marine phosphate fertiliser in Australia's main agricultural area (the Murray Darling Basin).
The oldest rocks on Earth: time constraints and geological controversies
Publisher: Geological Society of London
Date: 2001
Use of trace and rare earth elements to quantify autogenic and allogenic inputs within a lowland karst network
Publisher: Elsevier BV
Date: 03-2018
Palaeo-dust records: A window to understanding past environments
Publisher: Elsevier BV
Date: 06-2018
Trace-element systematics of sediments in the Murray–Darling Basin, Australia: Sediment provenance and palaeoclimate implications of fine scale chemical heterogeneity
Publisher: Elsevier BV
Date: 08-2010
High-resolution LA-ICP-MS trace element mapping of igneous minerals: In search of magma histories
Publisher: Elsevier BV
Date: 08-2015
Goldschmidt Abstracts 2009 – P
Publisher: Elsevier BV
Date: 06-2009
Quantifying chemical weathering intensity and trace element release from two contrasting basalt profiles, Deccan Traps, India
Publisher: Elsevier BV
Date: 2014
Goldschmidt Abstracts 2009 – M
Publisher: Elsevier BV
Date: 06-2009
The Source of the Great Dyke, Zimbabwe, and Its Tectonic Significance: Evidence from Re‐Os Isotopes
Publisher: University of Chicago Press
Date: 09-2003
DOI: 10.1086/376766
Goldschmidt Abstracts 2009 – R
Publisher: Elsevier BV
Date: 06-2009
Differentiated impact melt sheets may be a potential source of Hadean detrital zircon
Publisher: Geological Society of America
Date: 28-04-2016
DOI: 10.1130/G37898.1
Laterally extensive modified placer gold deposits in the Paleoproterozoic Mississagi Formation, Clement and Pardo Townships, Ontario
Publisher: Canadian Science Publishing
Date: 05-2011
DOI: 10.1139/E10-101
Abstract: Local gold concentrations are found in laterally extensive pyrite-bearing, framework-supported, cobble and boulder conglomerates in the basal 30 m of the Mississagi Formation in the south eastern part of the Huronian outcrop belt. These were deposited as part of a valley-fill succession, in shallow gravel-bed braided rivers with local hyperconcentrated flows. The basal contact with underlying Archean psammites is typically highly irregular and shows no obvious sign of weathering suggesting that deposition took place soon after retreat of the glaciers responsible for deposition of the Ramsey Lake Formation. Highest gold concentrations are associated with moderately well-sorted medium to large pebble conglomerate that show some signs of reworking during low flow events. Depositional elements are typically lenticular and of limited lateral extent. Unlike the older pyritic quartz-pebble conglomerates at the base of the Matinenda Formation in the Elliot Lake and Blind River areas, these conglomerates contain no uraninite and are polymict with material derived from a highly restricted catchment area with marked local and regional topographic relief. Porous detrital allogenic pyrite and euhedral post-depositional pyrite have overlapping, generally positive δ 34 S values, indicating a closed system during diagenesis and metamorphism. The presence of biotite-enriched rims on many of the metavolcanic and metasedimentary clasts in the conglomerates suggests that gold was partly leached from the allogenic pyrite grains at the peak of the Penokean Orogeny at 1.85–1.5 Ga. The potential source of the Au-bearing detrital allogenic pyrite appears to be an as yet undiscovered Archean volcanic-hosted massive sulfide (VHMS) deposit located 1 to 8 km north of the deposit.
Geochemistry of late Archaean stromatolites from Zimbabwe: evidence for microbial life in restricted epicontinental seas
Publisher: Elsevier BV
Date: 07-2004
VizualAge: A Novel Approach to Laser Ablation ICP‐MS U‐Pb Geochronology Data Reduction
Publisher: Wiley
Date: 06-03-2012
An empirical test of the crystal lattice strain model for rare-earth element partitioning into clinopyroxene
Publisher: Elsevier BV
Date: 02-2013
Comment on “Lead isotopic evidence for an Australian source of Aeolian dust to Antarctica at times over the last 170,000 years” by P. De Deckker, M. Norman, I.D. Goodwin, A. Wain and F.X. Gingele [Pal
Publisher: Elsevier BV
Date: 12-2010
Evidence for a very thick Kaapvaal craton root: Implications for equilibrium fossil geotherms in the early continental lithosphere
Publisher: Elsevier BV
Date: 11-2022
Volcanic resurfacing and the early terrestrial crust: Zircon U–Pb and REE constraints from the Isua Greenstone Belt, southern West Greenland
Publisher: Elsevier BV
Date: 12-2005
Chapter 2.4 The Enigma of the Terrestrial Protocrust: Evidence for Its Former Existence and the Importance of Its Complete Disappearance
Publisher: Elsevier
Date: 2007
In Situ U/Pb Granulite‐Hosted Zircon Dates, Kapuskasing Structural Zone, Ontario: A Late Archean Large Igneous Province (LIP) as a Substrate for Juvenile Crust
Publisher: University of Chicago Press
Date: 09-2009
DOI: 10.1086/600864
Role of ‘hidden’ deeply subducted slabs in mantle depletion
Publisher: Elsevier BV
Date: 05-2000
Selective analysis of petroleum from single fluid inclusions using femtosecond laser pulses
Publisher: Elsevier BV
Date: 06-2009
U–Th–Pb fractionation in Archaean lower continental crust: Implications for terrestrial Pb isotope systematics
Publisher: Elsevier BV
Date: 02-2007
The geochemistry of late Archaean microbial carbonate: implications for ocean chemistry and continental erosion history
Publisher: Elsevier BV
Date: 08-2001
Pleistocene relief production in Laramide mountain ranges, western United States: Comment and Reply
Publisher: Geological Society of America
Date: 1998
A review of the isotopic and trace element evidence for mantle and crustal processes in the Hadean and Archean: Implications for the onset of plate tectonic subduction
Publisher: Geological Society of America
Date: 2008
Differentiated impact melt sheets may be a potential source of Hadean detrital zircon: REPLY
Publisher: Geological Society of America
Date: 21-07-2016
DOI: 10.1130/G38239Y.1
Combined Chemical Separation of Lu, Hf, Sm, Nd, and REEs from a Single Rock Digest: Precise and Accurate Isotope Determinations of Lu−Hf and Sm−Nd Using Multicollector-ICPMS
Publisher: American Chemical Society (ACS)
Date: 20-11-2001
DOI: 10.1021/AC010705Z
Abstract: A combined procedure for separating Lu, Hf, Sm, Nd, and rare earth elements (REEs) from a single s le digest is presented. The procedure consists of the following five steps: (1) s le dissolution via sodium peroxide sintering (2) separation of the high field strength elements from the REEs and other matrix elements by a HF-free anion-exchange column procedure (3) purification of Hf on a cation-exchange resin (4) separation of REEs from other matrix elements by cation exchange (5) Lu, Sm, and Nd separation from the other REEs by reversed-phase ion chromatography. Analytical reproducibilities of Sm-Nd and Lu-Hf isotope systematics are demonstrated for standard solutions and international rock reference materials. Results show overall good reproducibilities for Sm-Nd systematics independent of the rock type analyzed. For the Lu-Hf systematics, the reproducibility of the parent/daughter ratio is much better for JB-1 (basalt) than for two analyzed felsic crustal rocks (DR-N and an Archaean granitoid). It is demonstrated that this poorer reproducibility of the Lu/Hf ratio is truly caused by s le heterogeneity thus, results are geologically reasonable.
Does a Heavy Fe-Isotope Composition of Akilia Quartz-Amphibole-Pyroxene Rocks Necessitate a BIF Origin?
Publisher: Mary Ann Liebert Inc
Date: 10-2015
Abstract: The age and origin of the quartz- hibole-pyroxene (qap) gneiss from the island of Akilia, southern West Greenland, have been the subject of intense debate since the light C-isotope composition of graphite inclusions in apatite was interpreted to indicate the presence of Earth's earliest biological activity. Although this claim for biogenic relicts has been vigorously challenged, the possibility that the rocks might represent some of Earth's earliest water-lain sediments and, hence, a suitable repository for life remains an open question. While some workers have suggested that the entire sequence represents an originally mafic-ultramafic igneous precursor subsequently modified by metasomatism, quartz injection, high-grade metamorphism, and extreme ductile deformation, others maintain that at least a small part of the sequence retains geochemical characteristics indicative of a chemical sedimentary origin. Fractionated Fe isotopes with δ(56)Fe values similar to those observed in Isua BIF have been reported from high-SiO2 units of qap and used to support a chemical sedimentary protolith for the qap unit. Here, we present new Fe isotope data from all lithologic variants in the qap gneiss on Akilia, including layers of undisputed ultramafic igneous origin. Since the latter require introduction of fractionated Fe into at least part of the qap unit, we argue that Fe isotopes must therefore be treated with considerable caution when used to infer BIF for part or all of the qap protolith.
Dust emissions from Kati Thanda-Lake Eyre: a review
Publisher: Informa UK Limited
Date: 02-01-2022
Discrete metamorphic events in the Limpopo belt, southern Africa: Implications for the application of P-T paths in complex metamorphic terrains
Publisher: Geological Society of America
Date: 1994
Geochemistry of Ocean Floor and Fore-arc Serpentinites: Constraints on the Ultramafic Input to Subduction Zones
Publisher: Oxford University Press (OUP)
Date: 16-12-2011
Reply to the discussion by Karen Johannesson on 'Rare earth element geochemistry of scleractinian coral skeleton during meteoric diagenesis: A sequence through neomorphism of aragonite to calcite' by Webb et al., Sedimentology, 56, 1433-1463
Publisher: Wiley
Date: 18-07-2012
Petrological, mineralogical and geochemical peculiarities of Archaean cratons
Publisher: Elsevier BV
Date: 04-2019
New insights into Paleoproterozoic surficial conditions revealed by 1.85 Ga corestone-rich saprolith
Publisher: Elsevier BV
Date: 07-0033
An exsolution origin for Archean mantle garnet
Publisher: Geological Society of America
Date: 08-12-2017
DOI: 10.1130/G39680.1
The formation of large neoblasts in shocked zircon and their utility in dating impacts
Publisher: Geological Society of America
Date: 02-10-2017
DOI: 10.1130/G39328.1
Extreme Nd-isotope heterogeneity in the early Archaean—fact or fiction? Case histories from northern Canada and West Greenland—Reply
Publisher: Elsevier BV
Date: 06-1998
In Situ Trace Element and Sulfur Isotope Analysis of Pyrite in a Paleoproterozoic Gold Placer Deposit, Pardo and Clement Townships, Ontario, Canada
Publisher: Society of Economic Geologists
Date: 06-2011
Unprecedented wind erosion and perturbation of surface geochemistry marks the Anthropocene in Australia
Publisher: American Geophysical Union (AGU)
Date: 2014
DOI: 10.1002/2013JF002948
Geochemical fingerprinting: 40 years of analytical development and real world applications
Publisher: Elsevier BV
Date: 06-2009
Mo isotope composition of the 0.85 Ga ocean from coupled carbonate and shale archives: Some implications for pre-Cryogenian oxygenation
Publisher: Elsevier BV
Date: 08-2022
Volcanic crystals as time capsules of eruption history
Publisher: Springer Science and Business Media LLC
Date: 23-01-2018
DOI: 10.1038/S41467-017-02274-W
Abstract: Crystals formed prior to a volcanic event can provide evidence of processes leading to and timing of eruptions. Clinopyroxene is common in basaltic to intermediate volcanoes, however, its ability as a recorder of pre-eruptive histories has remained comparatively underexplored. Here we show that novel high-resolution trace element images of clinopyroxene track eruption triggers and timescales at Mount Etna (Sicily, Italy). Chromium (Cr) distribution in clinopyroxene from 1974 to 2014 eruptions reveals punctuated episodes of intrusion of primitive magma at depth. Magma mixing efficiently triggered volcanism (success rate up to 90%), within only 2 weeks of arrival of mafic intrusions. Clinopyroxene zonations distinguish between injections of mafic magma and regular recharges with more evolved magma, which often fail to tip the system to erupt. High Cr zonations can therefore be used to reconstruct past eruptions and inform responses to geophysical signals of volcano unrest, potentially offering an additional approach to volcano hazard monitoring.
Lamproitic Rocks from a Continental Collision Zone: Evidence for Recycling of Subducted Tethyan Oceanic Sediments in the Mantle Beneath Southern Tibet
Publisher: Oxford University Press (OUP)
Date: 09-01-2007
Chemostratigraphy of the Sudbury impact basin fill: Volatile metal loss and post-impact evolution of a submarine impact basin
Publisher: Elsevier BV
Date: 06-2016
Elemental and isotopic behaviour of Zn in Deccan basalt weathering profiles: Chemical weathering from bedrock to laterite and links to Zn deficiency in tropical soils
Publisher: Elsevier BV
Date: 04-2018
DOI: 10.1016/J.SCITOTENV.2017.11.112
Abstract: Zinc (Zn) is a micronutrient for organisms and essential for plant growth, therefore knowledge of its elemental cycling in the surface environment is important regarding wider aspects of human nutrition and health. To explore the nature of Zn cycling, we compared its weathering behaviour in a sub-recent regolith versus an ancient laterite profile of the Deccan Traps, India - an area of known soil Zn deficiency. We demonstrate that progressive breakdown of primary minerals and the associated formation of phyllosilicates and iron oxides leads to a depletion in Zn, ultimately resulting in a loss of 80% in lateritic residues. This residue is mainly composed of resistant iron oxides and hydroxides ultimately delivering insufficient amounts of bio-available Zn. Moreover, (sub)-tropical weathering in regions experiencing extended tectonic quiescence (e.g., cratons) further enhance the development of old and deep soil profiles that become deficient in Zn. This situation is clearly revealed by the spatial correlation of the global distribution of laterites, cratons (Africa, India, South America and Australia) and known regions of Zn deficient soils that result in health problems for humans whose diet is derived from such land. We also investigate whether this elemental depletion of Zn is accompanied by isotope fractionation. In the saprolitic horizons of both weathering profiles, compositions of δ
Comparison of Pb Purification by Anion-Exchange Resin Methods and Assessment of Long-Term Reproducibility of Th/U/Pb Ratio Measurements by Quadrupole ICP-MS
Publisher: Wiley
Date: 06-2009
Extreme Nd-isotope heterogeneity in the early Archaean — fact or fiction? Case histories from northern Canada and West Greenland
Publisher: Elsevier BV
Date: 03-1997
Apatite Chlorine Concentration Measurements by LA ‐ICP ‐MS
Publisher: Wiley
Date: 21-06-2013
Geological constraints on detecting the earliest life on Earth: a perspective from the Early Archaean (older than 3.7 Gyr) of southwest Greenland
Publisher: The Royal Society
Date: 05-05-2006
Abstract: At greater than 3.7 Gyr, Earth's oldest known supracrustal rocks, comprised dominantly of mafic igneous with less common sedimentary units including banded iron formation (BIF), are exposed in southwest Greenland. Regionally, they were intruded by younger tonalites, and then both were intensely dynamothermally metamorphosed to granulite facies (the highest pressures and temperatures generally encountered in the Earth's crust during metamorphism) in the Archaean and subsequently at lower grades until about 1500 Myr ago. Claims for the first preserved life on Earth have been based on the occurrence of greater than 3.8 Gyr isotopically light C occurring as graphite inclusions within apatite crystals from a 5 m thick purported BIF on the island of Akilia. Detailed geologic mapping and observations there indicate that the banding, first claimed to be depositional, is clearly deformational in origin. Furthermore, the mineralogy of the supposed BIF, being dominated by pyroxene, hibole and quartz, is unlike well-known BIF from the Isua Greenstone Belt (IGB), but resembles enclosing mafic and ultramafic igneous rocks modified by metasomatism and repeated metamorphic recrystallization. This scenario parsimoniously links the geology, whole-rock geochemistry, 2.7 Gyr single crystal zircon ages in the unit, an approximately 1500 Myr age for apatites that lack any graphite, non-MIF sulphur isotopes in the unit and an inconclusive Fe isotope signature. Although both putative body fossils and carbon-12 enriched isotopes in graphite described at Isua are better explained by abiotic processes, more fruitful targets for examining the earliest stages in the emergence of life remain within greater than 3.7 Gyr IGB, which preserves BIF and other rocks that unambiguously formed at Earth's surface.
Reconstructing transport pathways for late Quaternary dust from eastern Australia using the composition of trace elements of long traveled dusts
Publisher: Elsevier BV
Date: 04-2009
Lead Isotope Geochemistry of Shales from the Wolverine Volcanogenic Massive Sulfide Deposit, Yukon: Implications for Pb Isotope Vectoring in Exhalative Ore Systems
Publisher: Society of Economic Geologists
Date: 02-2019
Modern weathering in outcrop samples versus ancient paleoredox information in drill core samples from a Mesoarchaean marine oxygen oasis in Pongola Supergroup, South Africa
Publisher: Elsevier BV
Date: 11-2019
Estimates of Australian dust flux into New Zealand: Quantifying the eastern Australian dust plume pathway using trace element calibrated 210Pb as a monitor
Publisher: Elsevier BV
Date: 11-2005
Priscoan (4.00–4.03 Ga) orthogneisses from northwestern Canada - by Samuel A. Bowring and Ian S. Williams: discussion
Publisher: Springer Science and Business Media LLC
Date: 29-03-2001
Petrographic Microscopy with Ray Tracing and Segmentation from Multi-Angle Polarisation Whole-Slide Images
Publisher: MDPI AG
Date: 20-01-2023
DOI: 10.3390/MIN13020156
Abstract: ‘Slide scanners’ are rapid optical microscopes equipped with automated and accurate x-y travel stages with virtual z-motion that cannot be rotated. In biomedical microscopic imaging, they are widely deployed to generate whole-slide images (WSI) of tissue s les in various modes of illumination. The availability of WSI has motivated the development of instrument-agnostic advanced image analysis software, helping drug development, pathology, and many other areas of research. Slide scanners are now being modified to enable polarised petrographic microscopy by simulating stage rotation with the acquisition of multiple rotation angles of the polariser–analyser pair for observing randomly oriented anisotropic materials. Here we report on the calibration strategy of one repurposed slide scanner and describe a pilot image analysis pipeline designed to introduce the wider audience to the complexity of performing computer-assisted feature recognition on mineral groups. The repurposed biological scanner produces transmitted light plane- and cross-polarised (TL-PPL and XPL) and unpolarised reflected light (RL) WSI from polished thin sections or slim epoxy mounts at various magnifications, yielding pixel dimensions from ca. 2.7 × 2.7 to 0.14 × 0.14 µm. A data tree of 14 WSI is regularly obtained, containing two RL and six of each PPL and XPL WSI (at 18° rotation increments). This pyramidal image stack is stitched and built into a local server database simultaneously with acquisition. The pyramids (multi-resolution ‘cubes’) can be viewed with freeware locally deployed for teaching petrography and collaborative research. The main progress reported here concerns image analysis with a pilot open-source software pipeline enabling semantic segmentation on petrographic imagery. For this purpose, all WSI are post-processed and aligned to a ‘fixed’ reflective surface (RL), and the PPL and XPL stacks are then summarised in one image, each with ray tracing that describes visible light reflection, absorption, and O- and E-wave interference phenomena. The maximum red-green-blue values were found to best overcome the limitation of refractive index anisotropy for segmentation based on pixel-neighbouring feature maps. This strongly reduces the variation in dichroism in PPL and interference colour in XPL. The synthetic ray trace WSI is then combined with one RL to estimate modal mineralogy with multi-scale algorithms originally designed for object-based cell segmentation in pathological tissues. This requires generating a small number of polygonal expert annotations that inform a training dataset, enabling on-the-fly machine learning classification into mineral classes. The accuracy of the approach was tested by comparison with modal mineralogy obtained by energy-dispersive spectroscopy scanning electron microscopy (SEM-EDX) for a suite of rocks of simple mineralogy (granulites and peridotite). The strengths and limitations of the pixel-based classification approach are described, and phenomena from s le preparation imperfections to semantic segmentation artefacts around fine-grained minerals and/or of indiscriminate optical properties are discussed. Finally, we provide an outlook on image analysis strategies that will improve the status quo by using the first-pass mineralogy identification from optical WSI to generate a location grid to obtain targeted chemical data (e.g., by SEM-EDX) and by considering the rock texture.
Age significance of U–Th–Pb zircon data from early Archaean rocks of west Greenland — a reassessment based on combined ion-microprobe and imaging studies — reply
Publisher: Elsevier BV
Date: 06-2001
Applications of accurate, high-precision Pb isotope ratio measurement by multi-collector ICP-MS
Publisher: Elsevier BV
Date: 08-2002
Aeolian sedimentation and climate variability during the late Quaternary in southeast Queensland, Australia
Publisher: Elsevier BV
Date: 08-2008
Oceanic nickel depletion and a methanogen famine before the Great Oxidation Event
Publisher: Springer Science and Business Media LLC
Date: 04-2009
DOI: 10.1038/NATURE07858
Abstract: It has been suggested that a decrease in atmospheric methane levels triggered the progressive rise of atmospheric oxygen, the so-called Great Oxidation Event, about 2.4 Gyr ago. Oxidative weathering of terrestrial sulphides, increased oceanic sulphate, and the ecological success of sulphate-reducing microorganisms over methanogens has been proposed as a possible cause for the methane collapse, but this explanation is difficult to reconcile with the rock record. Banded iron formations preserve a history of Precambrian oceanic elemental abundance and can provide insights into our understanding of early microbial life and its influence on the evolution of the Earth system. Here we report a decline in the molar nickel to iron ratio recorded in banded iron formations about 2.7 Gyr ago, which we attribute to a reduced flux of nickel to the oceans, a consequence of cooling upper-mantle temperatures and decreased eruption of nickel-rich ultramafic rocks at the time. We measured nickel partition coefficients between simulated Precambrian sea water and erse iron hydroxides, and subsequently determined that dissolved nickel concentrations may have reached approximately 400 nM throughout much of the Archaean eon, but dropped below approximately 200 nM by 2.5 Gyr ago and to modern day values ( approximately 9 nM) by approximately 550 Myr ago. Nickel is a key metal cofactor in several enzymes of methanogens and we propose that its decline would have stifled their activity in the ancient oceans and disrupted the supply of biogenic methane. A decline in biogenic methane production therefore could have occurred before increasing environmental oxygenation and not necessarily be related to it. The enzymatic reliance of methanogens on a diminishing supply of volcanic nickel links mantle evolution to the redox state of the atmosphere.
The evolving nature of terrestrial crust from the Hadean, through the Archaean, into the Proterozoic
Publisher: Elsevier BV
Date: 03-2015
Subduction related tectonic evolution of the Neoarchean eastern Dharwar Craton, southern India: New geochemical and isotopic constraints
Publisher: Elsevier BV
Date: 04-2013
Geochemical and microstructural evidence for in situ formation of pseudotachylitic Sudbury breccia by shock-induced compression and cataclasis
Publisher: Elsevier BV
Date: 07-2010
Initial Pb of the Amı̂tsoq gneiss revisited: implications for the timing of early Archaean crustal evolution in West Greenland — Reply
Publisher: Elsevier BV
Date: 05-2000
Goldschmidt Conference Abstracts 2005
Publisher: Elsevier BV
Date: 05-2005
3.43 billion-year-old stromatolite reef from the Pilbara Craton of Western Australia: Ecosystem-scale insights to early life on Earth
Publisher: Elsevier BV
Date: 10-2007
Adakite-like porphyries from the southern Tibetan continental collision zones: evidence for slab melt metasomatism
Publisher: Springer Science and Business Media LLC
Date: 23-09-2006
The behaviour of tungsten during mantle melting revisited with implications for planetary differentiation time scales
Publisher: Elsevier BV
Date: 02-2010
Ambient Redox and Hydrothermal Environment of the Wolverine Volcanogenic Massive Sulfide Deposit, Yukon: Insights from Lithofacies and Lithogeochemistry of Mississippian Host Shales
Publisher: Society of Economic Geologists
Date: 17-06-2016
Primitive mantle source components with variable initial (U+Th)/He and U/Pb inferred from new data from Tristan da Cunha
Publisher: Elsevier BV
Date: 08-2006
A new compositional estimate for refractory lower continental crust with implications for the first terrestrial Pb-isotope paradox
Publisher: Elsevier BV
Date: 2023
Goldschmidt Abstracts 2007- K
Publisher: Elsevier BV
Date: 08-2007
Lamproites from Gaussberg, Antarctica: Possible Transition Zone Melts of Archaean Subducted Sediments
Publisher: Oxford University Press (OUP)
Date: 06-2002
Evidence for highly refractory, heat producing element-depleted lower continental crust: Some implications for the formation and evolution of the continents
Publisher: Elsevier BV
Date: 10-2021
New W-isotope evidence for rapid terrestrial accretion and very early core formation
Publisher: Elsevier BV
Date: 09-2002
A refined solution to Earth’s hidden niobium: implications for evolution of continental crust and mode of core formation
Publisher: Elsevier BV
Date: 10-2003
Evaporative loss of moderately volatile metals from the superheated 1849 Ma Sudbury impact melt sheet inferred from stable Zn isotopes
Publisher: Elsevier BV
Date: 08-2020
Peraluminous potassium-rich granitoids in the Semail Ophiolite
Publisher: Springer Science and Business Media LLC
Date: 12-1994
DOI: 10.1007/BF00306644
Age constraints and geochemical evolution of the Neoarchean mafic–ultramafic Wabassi Intrusive Complex in the Miminiska–Fort Hope greenstone belt, Superior Province, Canada
Publisher: Elsevier BV
Date: 11-2016
Ultra-trace Element Characterization of the Central Ottawa River Basin using a Rapid, Flexible, and Low-volume ICP-MS Method
Publisher: Springer Science and Business Media LLC
Date: 05-05-2020
Weathering, alteration and reconstructing Earth's oxygenation
Publisher: The Royal Society
Date: 12-06-2020
Abstract: Deciphering the role—if any—that free oxygen levels played in controlling the timing and tempo of the radiation of complex life is one of the most fundamental questions in Earth and life sciences. Accurately reconstructing Earth's redox history is an essential part of tackling this question. Over the past few decades, there has been a proliferation of research employing geochemical redox proxies in an effort to tell the story of Earth's oxygenation. However, many of these studies, even those considering the same geochemical proxy systems, have led to conflicting interpretations of the timing and intensity of oxygenation events. There are two potential explanations for conflicting redox reconstructions: (i) that free oxygen levels were incredibly dynamic in both time and space or (ii) that collectively, as a community—including the authors of this article—we have frequently studied rocks affected by secondary weathering and alteration (particularly secondary oxidation) while neglecting to address the impact of this alteration on the generated data. There are now multiple case studies that have documented previously overlooked secondary alteration, resolving some of the conflicting constrains regarding redox evolution. Here, an analysis of a large shale geochemistry database reveals significant differences in cerium (Ce) anomalies, a common palaeoredox proxy, between outcrop and drill core s les. This inconsistency provides support for the idea that geochemical data from altered s les are frequently published in the peer-reviewed literature. As in iduals and a geochemical community, most of us have been slow to appreciate how pervasive the problem is but there are ex les of other communities that have faced and met the challenges raised by such quality control crises. Further evidence of the high potential for alteration of deep-time geochemical s les, and recognition of the manner in which this may lead to spurious results and palaeoenvironmental interpretations, indicate that s le archiving, in publicly accessible collections needs to become a prerequisite for publication of new palaeoredox data. Finally, the geochemical community need to think about ways to implement additional quality control measures to increase the fidelity of palaeoredox proxy work.
Different mineralization styles in a volcanic-hosted ore deposit: the fluid and isotopic signatures of the Mt Morgan Au–Cu deposit, Australia
Publisher: Elsevier BV
Date: 2003
Zr/Nb Systematics of Ocean Island Basalts Reassessed—the Case for Binary Mixing
Publisher: Oxford University Press (OUP)
Date: 07-2000
Evolution of Nd and Pb isotopes in Central Pacific seawater from ferromanganese crusts
Publisher: Elsevier BV
Date: 1997
A template for an improved rock-based subdivision of the pre-Cryogenian timescale
Publisher: Geological Society of London
Date: 07-07-2021
DOI: 10.1144/JGS2020-222
The Neoarchaean surficial sulphur cycle: An alternative hypothesis based on analogies with 20th‐century atmospheric lead
Publisher: Wiley
Date: 16-03-2017
DOI: 10.1111/GBI.12234
Abstract: We revisit the S-isotope systematics of sedimentary pyrite in a shaly limestone from the ca. 2.52 Ga Gamohaan Formation, Upper C bellrand Subgroup, Transvaal, South Africa. The analysed rock is interpreted to have been deposited in a water depth of ca. 50-100 m, in a restricted sub-basin on a drowning platform. A previous study discovered that the pyrites define a nonzero intercept δ
Provenance of long-travelled dust determined with ultra-trace-element composition: a pilot study with samples from New Zealand glaciers
Publisher: Wiley
Date: 2005
DOI: 10.1002/ESP.1169
A combined Y/Ho, high field strength element (HFSE) and Nd isotope perspective on basalt weathering, Deccan Traps, India
Publisher: Elsevier BV
Date: 03-2015
Proterozoic Transpressive Deformation in the Northern Marginal Zone, Limpopo Belt, Zimbabwe
Publisher: University of Chicago Press
Date: 09-1995
DOI: 10.1086/629772
The Influence of Large Bolide Impacts on Earth's Carbon Cycle
Publisher: Mineralogical Society of America
Date: 10-2019
DOI: 10.2138/GSELEMENTS.15.5.313
Abstract: Human society's rapid release of vast quantities of CO2 into the atmosphere is a significant planetary experiment. An obvious natural process capable of similar emissions over geologically short time spans are very large bolide impacts. When striking a carbon-rich target, bolides significantly, and potentially catastrophically, disrupt the global biogeochemical carbon cycle. Independent factors, such as sulfur-rich targets, redox state of the oceans or encountering ecosystems already close to a tipping point, dictated the magnitude of further consequences and determined which large bolide strikes shaped Earth's evolution. On the early Earth, where carbon-rich sedimentary targets were rare, impacts may not have been purely destructive. Instead, enclosed subaqueous impact structures may have contributed to initiating Earth's unique carbon cycle.
From ocean to mantle: new evidence for U-cycling with implications for the HIMU source and the secular Pb isotope evolution of Earth's mantle
Publisher: Elsevier BV
Date: 09-2018
IMAGING ELEMENT-DISTRIBUTION PATTERNS IN MINERALS BY LASER ABLATION - INDUCTIVELY COUPLED PLASMA - MASS SPECTROMETRY (LA-ICP-MS)
Publisher: Mineralogical Association of Canada
Date: 10-2009
An estimate of 1.9Ga mantle depletion using the high-field-strength elements and Nd–Pb isotopes of ocean floor basalts, Flin Flon Belt, Canada
Publisher: Elsevier BV
Date: 08-2011
High-precision analysis on annual variations of heavy metals, lead isotopes and rare earth elements in mangrove tree rings by inductively coupled plasma mass spectrometry
Publisher: Elsevier BV
Date: 02-2007
Boron and arsenic in highly evolved Archean felsic rocks: Implications for Archean subduction processes
Publisher: Elsevier BV
Date: 10-2008
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