ORCID Profile
0000-0002-0832-6625
Current Organisations
Universidade Federal do Paraná
,
Australian National University
,
Macquarie University
,
Géosciences Montpellier
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
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)
Geology | Igneous And Metamorphic Petrology | Igneous and Metamorphic Petrology | Tectonics | Seismology and Seismic Exploration | Mineralogy and Crystallography | Geophysics | Geochemistry | Inorganic Geochemistry | Exploration Geochemistry | Geophysics Not Elsewhere Classified | Geochemistry Not Elsewhere Classified | Geotectonics | Geodynamics | Electrical and Electromagnetic Methods in Geophysics
ANZSRC Socio-Economic Objective (SEO)
Mineral Exploration not elsewhere classified | Earth sciences | Measurement standards and calibration services not elsewhere classified | Expanding Knowledge in the Earth Sciences | Precious (Noble) Metal Ore Exploration | Titanium Minerals, Zircon, and Rare Earth Metal Ore (e.g. Monazite) Exploration | Copper Ore Exploration |
Related Links
Publications
In situ measurement of Re-Os isotopes in mantle sulfides by laser ablation multicollector-inductively coupled plasma mass spectrometry: Analytical methods and preliminary results
Publisher: Elsevier BV
Date: 03-2002
Microscale Petrographic, Trace Element, and Isotopic Constraints on Glauconite Diagenesis in Altered Sedimentary Sequences: Implications for Glauconite Geochronology
Publisher: American Geophysical Union (AGU)
Date: 04-2023
DOI: 10.1029/2022GC010795
Abstract: Glauconite is an authigenic clay mineral that is common in marine sedimentary successions. Dating of glauconite to determine the depositional age of sedimentary sequences has a long history but has fallen into disfavor due to the difficulty of obtaining “pure” glauconite separates. Recent advances in sedimentary petrography and reaction cell mass spectrometry permit rapid in situ Rb‐Sr dating of carefully screened glauconite grains. However, glauconite remains susceptible to burial alteration so that successful application of in situ Rb‐Sr glauconite geochronology requires improved, microscale constraints on the impact of postdepositional alteration on glauconite Rb‐Sr systematics and articulation of robust criteria for identifying grains suitable for geochronology. Here, we address these questions by combining SEM‐EDS mineral mapping, geochemical characterization, and in situ Rb‐Sr dating of glauconite grains in partially altered lower Cambrian sedimentary sequences from the Arrowie and Amadeus basins in Australia. Our approach provides information at high spatial resolution, representing new insights into the interplay between source material, burial fluids, and diagenetic processes. Among the different glauconite classes, which we classify based on alteration and inclusion type, only the primary apatite‐bearing “pristine” glauconite returns an age within the error of the expected stratigraphic age. We attribute the preservation of a depositional Rb‐Sr age to the influence of Sr‐rich, alteration‐resistant apatite and the limited permeability of the clay‐rich strata hosting these grains. We conclude that our combined petrographic–geochemical screening approach holds considerable potential for identifying the best preserved glauconite grains for in situ Rb‐Sr geochronology.
Sulfur and selenium systematics of the subcontinental lithospheric mantle: Inferences from the Massif Central xenolith suite (France)
Publisher: Elsevier BV
Date: 11-2003
Laser ablation ICP-MS study of IIIAB irons and pallasites: constraints on the behaviour of highly siderophile elements during and after planetesimal core formation
Publisher: Elsevier BV
Date: 08-2004
The Lherz spinel lherzolite: Refertilized rather than pristine mantle
Publisher: Elsevier BV
Date: 07-2007
Abundance and distribution of platinum-group elements in orogenic lherzolites; a case study in a Fontete Rouge lherzolite (French Pyrénées)
Publisher: Elsevier BV
Date: 02-2008
Corrigendum to “Sulfide in dunite channels reflects long-distance reactive migration of mid-ocean-ridge melts from mantle source to crust: A Re-Os isotopic perspective” (Earth and Planetary Science Letters (2020) 531, (S0012821X19306612), (10.1016/j.epsl.2019.115969))
Publisher: Elsevier BV
Date: 04-2020
Geochemistry of the highly depleted peridotites drilled at ODP Sites 1272 and 1274 (Fifteen-Twenty Fracture Zone, Mid-Atlantic Ridge): Implications for mantle dynamics beneath a slow spreading ridge
Publisher: Elsevier BV
Date: 03-2008
Platinum-group element micronuggets and refertilization process in Lherz orogenic peridotite (northeastern Pyrenees, France)
Publisher: Elsevier BV
Date: 2010
Hydrogen, trace, and ultra-trace element distribution in natural olivines
Publisher: Springer Science and Business Media LLC
Date: 19-03-2021
Characterization of hydration in the mantle lithosphere: Peridotite xenoliths from the Ontong Java Plateau as an example
Publisher: Elsevier BV
Date: 2015
Trace element geochemistry of ordinary chondrite chondrules: The type I/type II chondrule dichotomy
Publisher: Elsevier BV
Date: 04-2015
Supplementary material to "Long-term study on coarse mode aerosols in the Amazon rain forest with the frequent intrusion of Saharan dust plumes"
Publisher: Copernicus GmbH
Date: 13-12-2017
Volatile-rich Metasomatism in Montferrier Xenoliths (Southern France): Implications for the Abundances of Chalcophile and Highly Siderophile Elements in the Subcontinental Mantle
Publisher: Oxford University Press (OUP)
Date: 21-09-2011
Trace element geochemistry of CR chondrite metal
Publisher: Wiley
Date: 10-2013
DOI: 10.1111/MAPS.12212
The relationship between CK and CV chondrites
Publisher: Elsevier BV
Date: 03-2010
Parageneses of TiB2in corundum xenoliths from Mt. Carmel, Israel
Publisher: Mineralogical Society of America
Date: 11-2020
DOI: 10.2138/AM-2020-7375
Abstract: Titanium diboride (TiB2) is a minor but common phase in melt pockets trapped in the corundum aggregates that occur as xenoliths in Cretaceous basaltic volcanoes on Mt. Carmel, north Israel. These melt pockets show extensive textural evidence of immiscibility between metallic (Fe-Ti-C-Si) melts, Ca-Al-Mg-Si-O melts, and Ti-(oxy)nitride melts. The metallic melts commonly form spherules in the coexisting oxide glass. Most of the observed TiB2 crystallized from the Fe-Ti-C silicide melts and a smaller proportion from the oxide melts. The parageneses in the melt pockets of the xenoliths require fO2 ≤ ΔIW-6, probably generated through interaction between evolved silicate melts and mantle-derived CH4+H2 fluids near the crust-mantle boundary. Under these highly reducing conditions boron, like carbon and nitrogen, behaved mainly as a siderophile element during the separation of immiscible metallic and oxide melts. These parageneses have implications for the residence of boron in the peridotitic mantle and for the occurrence of TiB2 in other less well-constrained environments such as ophiolitic chromitites.
Type I eclogites from Roberts Victor kimberlites: Products of extensive mantle metasomatism
Publisher: Elsevier BV
Date: 11-2011
Determination of intratest variability of trace elements in foraminifera by laser ablation inductively coupled plasma-mass spectrometry
Publisher: American Geophysical Union (AGU)
Date: 12-2003
DOI: 10.1029/2003GC000539
Platinum-group element systematics and petrogenetic processing of the continental upper mantle: A review
Publisher: Elsevier BV
Date: 04-2013
Femtosecond Laser Ablation-ICP-Mass Spectrometry and CHNS Elemental Analyzer Reveal Trace Element Characteristics of Danburite from Mexico, Tanzania, and Vietnam
Publisher: MDPI AG
Date: 29-05-2018
DOI: 10.3390/MIN8060234
Sulfides and chalcophile elements in Roberts Victor eclogites: Unravelling a sulfide-rich metasomatic event
Publisher: Elsevier BV
Date: 09-2013
Water content and hydrogen behaviour during metasomatism in the uppermost mantle beneath Ray Pic volcano (Massif Central, France)
Publisher: Elsevier BV
Date: 11-2015
A volcanic district between the Hoggar uplift and the Tenere Rifts: Volcanology, geochemistry and age of the In-Ezzane lavas (Algerian Sahara)
Publisher: Elsevier BV
Date: 04-2014
Platinum-group elements: A new set of key tracers for the earth's interior
Publisher: Mineralogical Society of America
Date: 08-2008
Unradiogenic lead in Earth’s upper mantle
Publisher: Springer Science and Business Media LLC
Date: 22-07-2012
DOI: 10.1038/NGEO1531
The scale and origin of the osmium isotope variations in mid-ocean ridge basalts
Publisher: Elsevier BV
Date: 07-2007
Platinum-group element abundances in the upper mantle: New constraints from in situ and whole-rock analyses of massif central xenoliths (France)
Publisher: Elsevier BV
Date: 08-2001
Hydrogen isotopic composition of water from fossil micrometeorites in howardites
Publisher: Elsevier BV
Date: 07-2005
New insights into the Re-Os systematics of sub-continental lithospheric mantle from in situ analysis of sulphides
Publisher: Elsevier BV
Date: 10-2002
Long-term study on coarse mode aerosols in the Amazon rain forest with the frequent intrusion of Saharan dust plumes
Publisher: Copernicus GmbH
Date: 13-12-2017
Abstract: Abstract. In the Amazonian atmosphere, the aerosol coarse mode comprises a complex, erse, and variable mixture of bioaerosols emitted from the rain forest ecosystem, long-range transported Saharan dust, marine aerosols from the Atlantic Ocean, and coarse smoke particles from deforestation fires. For the rain forest, the coarse mode particles are of significance with respect to biogeochemical and hydrological cycling as well as ecology and biogeography. However, detailed knowledge on the physicochemical and biological properties as well as the ecological role of the Amazonian coarse mode is still sparse. This study presents results from multi-year coarse mode measurements at the remote Amazon Tall Tower Observatory (ATTO) site. It combines online aerosol observations, selected remote sensing and modelling results, as well as dedicated coarse mode s ling and analysis. The focal points of this study are a systematic characterization of aerosol coarse mode abundance and properties in the Amazonian atmosphere as well as a detailed analysis of the frequent, pulse-wise intrusion of African long-range transport (LRT) aerosols (comprising Saharan dust and African biomass burning smoke) into the Amazon Basin. We find that, on a multi-year time scale, the Amazonian coarse mode maintains remarkably constant concentration levels (with 0.4 cm−3 and 4.0 µg m−3 in the wet vs. 1.2 cm−3 and 6.5 µg m−3 in the dry season) with rather weak seasonal trends (in terms of abundance and size spectrum), which is in stark contrast to the pronounced biomass burning-driven seasonality of the submicron aerosol population and related parameters. For most of the time, bioaerosol particles from the forest biome account for a major fraction of the coarse mode background population. However, from Dec to Apr there are episodic intrusions of African LRT aerosols, comprising Saharan dust, sea salt particles from the transatlantic passages, and African biomass burning smoke. Remarkably, during the core period of this LRT season (i.e., Feb–Mar), the presence of LRT influence, occurring as a sequence of pulse-like plumes, appears to be rather the norm than an exception. The LRT pulses increase the coarse mode concentrations drastically (up to 100 µg m−3) and alter coarse mode composition as well as its size spectrum. Efficient transport of the LRT plumes into the Amazon Basin takes place in response to specific mesoscale circulation patterns in combination with the episodic absence of rain-related aerosol scavenging en route. Based on a modelling study, we estimated a dust deposition flux of 5–10 kg ha−1 a−1 in the region of the ATTO site. Furthermore, a chemical analysis quantified the substantial increase of crustal and sea salt elements under LRT conditions in comparison to the background coarse mode composition. With these results, we estimated the deposition fluxes of various elements that are considered as nutrients for the rain forest ecosystem. These estimates range from few g ha−1 a−1 up to several hundreds of g ha−1 a−1 in the ATTO region. The long-term data presented here provide a statistically solid basis for future studies of the manifold aspects of the dynamic coarse mode aerosol cycling in the Amazon. Thus, it may help to understand its biogeochemical relevance in this ecosystem as well as to evaluate to what extent anthropogenic influences have altered the coarse mode cycling already.
Influence of redox processes on the germanium isotopic composition of ordinary chondrites
Publisher: Elsevier BV
Date: 2020
Multi-mineral geochronology of kimberlites, kamafugites and alkaline-carbonatite rocks, SW São Francisco Craton, Brazil: Appraisal of intrusion ages
Publisher: Elsevier BV
Date: 12-2023
160 Ma of sporadic basaltic activity on the Languedoc volcanic line (Southern France) A peculiar case of lithosphere-asthenosphere interplay
Publisher: Elsevier BV
Date: 11-2010
Physical and chemical characteristics of particles produced by laser ablation of biogenic calcium carbonate
Publisher: Royal Society of Chemistry (RSC)
Date: 2008
DOI: 10.1039/B706727E
Highly siderophile element behaviour accompanying subduction of oceanic crust: Whole rock and mineral-scale insights from a high-pressure terrain
Publisher: Elsevier BV
Date: 03-2009
Pyrite tracks assimilation of crustal sulfur in Pyrenean peridotites
Publisher: Springer Science and Business Media LLC
Date: 03-11-2011
Laser-ablation microprobe (LAM)-ICPMS unravels the highly siderophile element geochemistry of the oceanic mantle
Publisher: Elsevier BV
Date: 07-2001
In situ Os isotopes in abyssal peridotites bridge the isotopic gap between MORBs and their source mantle
Publisher: Springer Science and Business Media LLC
Date: 08-2005
DOI: 10.1038/NATURE03902
Abstract: Abyssal peridotites are assumed to represent the mantle residue of mid-ocean-ridge basalts (MORBs). However, the osmium isotopic compositions of abyssal peridotites and MORB do not appear to be in equilibrium, raising questions about the cogenetic relationship between those two reservoirs. However, the cause of this isotopic mismatch is mainly due to a drastic filtering of the data based on the possibility of osmium contamination by sea water. Here we present a detailed study of magmatic sulphides (the main carrier of osmium) in abyssal peridotites and show that the 187Os/188Os ratio of these sulphides is of primary mantle origin and can reach radiogenic values suggesting equilibrium with MORB. Thus, the effect of sea water on the osmium systematics of abyssal peridotites has been overestimated and consequently there is no true osmium isotopic gap between MORBs and abyssal peridotites.
Magnesium isotope heterogeneity of the isotopic standard SRM980 and new reference materials for magnesium-isotope-ratio measurements
Publisher: Royal Society of Chemistry (RSC)
Date: 2003
DOI: 10.1039/B309273A
Geochemistry of Waziristan Ophiolite Complex, Pakistan: Implications for Petrogenesis and Tectonic Setting
Publisher: MDPI AG
Date: 23-02-2023
DOI: 10.3390/MIN13030311
Abstract: The Waziristan ophiolite complex (WOC), a segment of paleo-suture zone between the Indo-Pakistan plate to the south-east and the Afghan microplate to the north-west, is primarily composed of serpentinized dunites and serpentinites after harzburgites, crosscut by pyroxenites. The crustal portion dominantly comprises basalts and dolerites, with less abundant plagiogranites. Whole-rock XRF and trace element ICP-MS analyses were undertaken to determine the degree of melt extraction and subsequent geochemical depletion or enrichment of peridotite protoliths. The investigated peridotites are extremely refractory and show high Mg# values (0.88–0.92), low Al2O3 (0.19–0.96 wt%), total alkali values (0.02 Na2O + K2O ≤ 0.20 wt%), CaO (0.04–0.73 wt%), and TiO2 (0.001–0.017 wt%), but are rich in Cr (up to 3550 ppm) and Ni (up to 2340 ppm). Bulk REE modelling suggests that Waziristan peridotites underwent a high degree (15%–25% melting) of melt extraction in the closed system of spinel-bearing peridotite facies at shallow depths above a subduction zone and, in their chemistry (Sc, REE, Al2O3, and MgO), resemble Izu-Bonin-Mariana (IBM) forearc peridotites. Their U-shaped REE patterns and trace elements resemble peridotites derived from supra-subduction zone (SSZ) settings, especially a forearc setting, and also reflect metasomatism by slab-derived fluids. The ultramafic rocks preserve depletion in REE content (0.03 ΣREECN 0.60), indicating the highly depleted nature of refractory peridotites. The basalts (Mg#, 0.48-0.68) are similar in composition to typical boninite and show low to moderate MgO (6.2–13.0 wt%), low total alkali content (0.01–4.45 wt%) and TiO2 (0.13–0.17 wt%), but are higher in Al2O3 (≈11.9 wt%). They show a sub-alkaline affinity and possess geochemical signatures that are transitional from island arc basalt (IAB) magmas to boninitic magmas due to the changes from an extensional to a compressional regime during the initiation of subduction. These geochemical signatures suggest the formation of basalts from melts, resulting from the re-melting of the depleted mantle during intra-oceanic subduction initiation. The higher Th/Nb and V/Ti ratios of the studied basalts further confirm their generation in an SSZ setting characterized by subduction-derived fluids under higher oxidizing conditions. The mafic-ultramafic rocks of the WOC were, therefore, likely formed during intra-oceanic subduction initiation (forearc spreading) in the SSZ setting they were exhumed along a thrust fault, and obducted onto the forearc region as result of the collision between the Indian plate and the Afghan microplate.
Extreme reduction
Publisher: Elsevier BV
Date: 04-2020
Partitioning of nitrogen during melting and recycling in subduction zones and the evolution of atmospheric nitrogen
Publisher: Elsevier BV
Date: 10-2019
Guest Editorial Model Predictive Control in Energy Conversion Systems
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2021
Insights into the mantle geochemistry of scandium from a meta-analysis of garnet data
Publisher: Elsevier BV
Date: 06-2018
Ancient melt extraction from the oceanic upper mantle revealed by Re–Os isotopes in abyssal peridotites from the Mid-Atlantic ridge
Publisher: Elsevier BV
Date: 04-2006
Most abyssal peridotites are old!
Publisher: Elsevier BV
Date: 08-2006
Highly siderophile element behavior in high temperature processes - Preface
Publisher: Elsevier BV
Date: 08-2004
The isotopic composition of magnesium in mantle olivine: Records of depletion and metasomatism
Publisher: Elsevier BV
Date: 02-2006
Dating post-Archean lithospheric mantle: Insights from Re-Os and Lu-Hf isotopic systematics of the Cameroon Volcanic Line peridotites
Publisher: Elsevier BV
Date: 06-2020
Linking crustal and mantle events using in situ trace-element and isotope analysis
Publisher: Elsevier BV
Date: 08-2006
Relationships between the occurrence of accessory Ge-minerals and sphalerite in Variscan Pb-Zn deposits of the Bossost anticlinorium, French Pyrenean Axial Zone: Chemistry, microstructures and ore-dep
Publisher: Elsevier BV
Date: 04-2018
Cu isotope signature of granites
Publisher: Elsevier BV
Date: 08-2007
Multiple events in the Neo-Tethyan oceanic upper mantle: Evidence from Ru-Os-Ir alloys in the Luobusa and Dongqiao ophiolitic podiform chromitites, Tibet
Publisher: Elsevier BV
Date: 09-2007
Abundances of siderophile elements in H-chondrite metal grains: Implications for the origin of metal in unequilibrated ordinary chondrites
Publisher: Elsevier BV
Date: 2023
Platinum-group element signature of the primitive mantle rejuvenated by melt-rock reactions: evidence from Sumail peridotites (Oman Ophiolite)
Publisher: Wiley
Date: 02-2009
The compatibility of rhenium and osmium in natural olivine and their behaviour during mantle melting and basalt genesis
Publisher: Elsevier BV
Date: 30-04-2002
Incompatible trace element partitioning and residence in anhydrous spinel peridotites and websterites from the Ronda orogenic peridotite
Publisher: Elsevier BV
Date: 09-2000
Determination of selenium and tellurium concentrations in Pyrenean peridotites (Ariege, France): New insight into S/Se/Te systematics of the upper in mantle samples
Publisher: Elsevier BV
Date: 11-2010
Look between the grains
Publisher: Springer Science and Business Media LLC
Date: 11-2022
Advances in in-situ Rb-Sr dating using LA-ICP-MS/MS
Publisher: Elsevier BV
Date: 11-2022
Subcontinental lithosphere reactivation beneath the Hoggar swell (Algeria): Localized deformation, melt channeling and heat advection
Publisher: Elsevier BV
Date: 05-2015
MPI-DING reference glasses for in situ microanalysis: New reference values for element concentrations and isotope ratios
Publisher: American Geophysical Union (AGU)
Date: 02-2006
DOI: 10.1029/2005GC001060
Sulfide in dunite channels reflects long-distance reactive migration of mid-ocean-ridge melts from mantle source to crust: A Re-Os isotopic perspective
Publisher: Elsevier BV
Date: 02-2020
Lawsonite metasomatism and trace element recycling in subduction zones
Publisher: Wiley
Date: 11-03-2014
DOI: 10.1111/JMG.12074
Constraints on martian depleted shergottite volcanism from the petrogenesis of olivine-phyric shergottites NWA 2046 and NWA 4925
Publisher: Elsevier BV
Date: 06-2023
Isotopic decoupling during porous melt flow: A case-study in the Lherz peridotite
Publisher: Elsevier BV
Date: 03-2009
Melting of sediments in the deep mantle produces saline fluid inclusions in diamonds
Publisher: American Association for the Advancement of Science (AAAS)
Date: 03-05-2019
Abstract: We demonstrate the formation of highly saline mantle fluids by the reaction of subducted sediment with peridotite.
Application of Ge/Si ratios to ultramafic alkaline rocks using a novel LA-ICP- MS/MS method
Publisher: Elsevier BV
Date: 2023
Diffusional homogenization of light REE in garnet from the Day Nui Con Voi Massif in N-Vietnam: Implications for Sm–Nd geochronology and timing of metamorphism in the Red River shear zone
Publisher: Elsevier BV
Date: 07-2012
Unravelling the effects of melt depletion and secondary infiltration on mantle Re-Os isotopes beneath the French Massif Central
Publisher: Elsevier BV
Date: 2010
The Wet but Dry Mantle
Publisher: Geochemical Society
Date: 2020
Long-term study on coarse mode aerosols in the Amazon rain forest with the frequent intrusion of Saharan dust plumes
Publisher: Copernicus GmbH
Date: 16-07-2018
DOI: 10.5194/ACP-18-10055-2018
Abstract: Abstract. In the Amazonian atmosphere, the aerosol coarse mode comprises a complex, erse, and variable mixture of bioaerosols emitted from the rain forest ecosystem, long-range transported Saharan dust (we use Sahara as shorthand for the dust source regions in Africa north of the Equator), marine aerosols from the Atlantic Ocean, and coarse smoke particles from deforestation fires. For the rain forest, the coarse mode particles are of significance with respect to biogeochemical and hydrological cycling, as well as ecology and biogeography. However, knowledge on the physicochemical and biological properties as well as the ecological role of the Amazonian coarse mode is still sparse. This study presents results from multi-year coarse mode measurements at the remote Amazon Tall Tower Observatory (ATTO) site. It combines online aerosol observations, selected remote sensing and modeling results, as well as dedicated coarse mode s ling and analysis. The focal points of this study are a systematic characterization of aerosol coarse mode abundance and properties in the Amazonian atmosphere as well as a detailed analysis of the frequent, pulse-wise intrusion of African long-range transport (LRT) aerosols (comprising Saharan dust and African biomass burning smoke) into the Amazon Basin.We find that, on a multi-year time scale, the Amazonian coarse mode maintains remarkably constant concentration levels (with 0.4 cm−3 and 4.0 µg m−3 in the wet vs. 1.2 cm−3 and 6.5 µg m−3 in the dry season) with rather weak seasonality (in terms of abundance and size spectrum), which is in stark contrast to the pronounced biomass burning-driven seasonality of the submicron aerosol population and related parameters. For most of the time, bioaerosol particles from the forest biome account for a major fraction of the coarse mode background population. However, from December to April there are episodic intrusions of African LRT aerosols, comprising Saharan dust, sea salt particles from the transatlantic passage, and African biomass burning smoke. Remarkably, during the core period of this LRT season (i.e., February–March), the presence of LRT influence, occurring as a sequence of pulse-like plumes, appears to be the norm rather than an exception. The LRT pulses increase the coarse mode concentrations drastically (up to 100 µg m−3) and alter the coarse mode composition as well as its size spectrum. Efficient transport of the LRT plumes into the Amazon Basin takes place in response to specific mesoscale circulation patterns in combination with the episodic absence of rain-related aerosol scavenging en route. Based on a modeling study, we estimated a dust deposition flux of 5–10 kg ha−1 a−1 in the region of the ATTO site. Furthermore, a chemical analysis quantified the substantial increase of crustal and sea salt elements under LRT conditions in comparison to the background coarse mode composition. With these results, we estimated the deposition fluxes of various elements that are considered as nutrients for the rain forest ecosystem. These estimates range from few g ha−1 a−1 up to several hundreds of g ha−1 a−1 in the ATTO region.The long-term data presented here provide a statistically solid basis for future studies of the manifold aspects of the dynamic coarse mode aerosol cycling in the Amazon. Thus, it may help to understand its biogeochemical relevance in this ecosystem as well as to evaluate to what extent anthropogenic influences have altered the coarse mode cycling already.
The Amazon Tall Tower Observatory (ATTO): overview of pilot measurements on ecosystem ecology, meteorology, trace gases, and aerosols
Publisher: Copernicus GmbH
Date: 28-09-2015
DOI: 10.5194/ACP-15-10723-2015
Abstract: Abstract. The Amazon Basin plays key roles in the carbon and water cycles, climate change, atmospheric chemistry, and bio ersity. It has already been changed significantly by human activities, and more pervasive change is expected to occur in the coming decades. It is therefore essential to establish long-term measurement sites that provide a baseline record of present-day climatic, biogeochemical, and atmospheric conditions and that will be operated over coming decades to monitor change in the Amazon region, as human perturbations increase in the future. The Amazon Tall Tower Observatory (ATTO) has been set up in a pristine rain forest region in the central Amazon Basin, about 150 km northeast of the city of Manaus. Two 80 m towers have been operated at the site since 2012, and a 325 m tower is nearing completion in mid-2015. An ecological survey including a bio ersity assessment has been conducted in the forest region surrounding the site. Measurements of micrometeorological and atmospheric chemical variables were initiated in 2012, and their range has continued to broaden over the last few years. The meteorological and micrometeorological measurements include temperature and wind profiles, precipitation, water and energy fluxes, turbulence components, soil temperature profiles and soil heat fluxes, radiation fluxes, and visibility. A tree has been instrumented to measure stem profiles of temperature, light intensity, and water content in cryptogamic covers. The trace gas measurements comprise continuous monitoring of carbon dioxide, carbon monoxide, methane, and ozone at five to eight different heights, complemented by a variety of additional species measured during intensive c aigns (e.g., VOC, NO, NO2, and OH reactivity). Aerosol optical, microphysical, and chemical measurements are being made above the canopy as well as in the canopy space. They include aerosol light scattering and absorption, fluorescence, number and volume size distributions, chemical composition, cloud condensation nuclei (CCN) concentrations, and hygroscopicity. In this paper, we discuss the scientific context of the ATTO observatory and present an overview of results from ecological, meteorological, and chemical pilot studies at the ATTO site.
Reworking of old continental lithosphere
Publisher: Elsevier BV
Date: 02-2020
Heterogeneous hydrogen distribution in orthopyroxene from veined mantle peridotite (San Carlos, Arizona): Impact of melt-rock interactions
Publisher: Elsevier BV
Date: 03-2018
A multi-technique study of platinum group element systematic in some Ligurian ophiolitic peridotites, Italy
Publisher: Elsevier BV
Date: 08-2004
Non-chondritic distribution of the highly siderophile elements in mantle sulphides
Publisher: Springer Science and Business Media LLC
Date: 10-2000
DOI: 10.1038/35038049
Abstract: The abundances of highly siderophile (iron-loving) elements (HSEs) in the Earth's mantle provide important constraints on models of the Earth's early evolution. It has long been assumed that the relative abundances of HSEs should reflect the composition of chondritic meteorites--which are thought to represent the primordial material from which the Earth was formed. But the non-chondritic abundance ratios recently found in several types of rock derived from the Earth's mantle have been difficult to reconcile with standard models of the Earth's accretion, and have been interpreted as having arisen from the addition to the primitive mantle of either non-chondritic extraterrestrial material or differentiated material from the Earth's core. Here we report in situ laser-ablation analyses of sulphides in mantle-derived rocks which show that these sulphides do not have chondritic HSE patterns, but that different generations of sulphide within single s les show extreme variability in the relative abundances of HSEs. Sulphides enclosed in silicate phases have high osmium and iridium abundances but low Pd/Ir ratios, whereas pentlandite-dominated interstitial sulphides show low osmium and iridium abundances and high Pd/Ir ratios. We interpret the silicate-enclosed sulphides as the residues of melting processes and interstitial sulphides as the crystallization products of sulphide-bearing (metasomatic) fluids. We suggest that non-chondritic HSE patterns directly reflect processes occurring in the upper mantle--that is, melting and sulphide addition via metasomatism--and are not evidence for the addition of core material or of 'exotic' meteoritic components.
Multiple events in oceanic upper mantle
Publisher: Elsevier BV
Date: 08-2006
International Handbook of the Learning Sciences
Publisher: Routledge
Date: 19-04-2018
The provenance of early Iron Age ferrous remains from southeastern Arabia
Publisher: Elsevier BV
Date: 08-2020
Optimisation of laser and mass spectrometer parameters for the in situ analysis of Rb/Sr ratios by LA-ICP-MS/MS
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0JA00308E
Abstract: This study presents a comprehensive examination of LA-ICP-MS/MS operating parameters and calibration strategies for the precise and accurate determination of in situ Rb/Sr ratios.
The formation conditions of enstatite chondrites: Insights from trace element geochemistry of olivine-bearing chondrules in Sahara 97096 (EH3)
Publisher: Wiley
Date: 03-08-2015
DOI: 10.1111/MAPS.12481
Nitrogen under Super-Reducing Conditions: Ti Oxynitride Melts in Xenolithic Corundum Aggregates from Mt Carmel (N. Israel)
Publisher: MDPI AG
Date: 18-07-2021
DOI: 10.3390/MIN11070780
Abstract: Titanium oxynitrides (Ti(N,O,C)) are abundant in xenolithic corundum aggregates in pyroclastic ejecta of Cretaceous volcanoes on Mount Carmel, northern Israel. Petrographic observations indicate that most of these nitrides existed as melts, immiscible with coexisting silicate and Fe-Ti-C silicide melts some nitrides may also have crystallized directly from the silicide melts. The TiN phase shows a wide range of solid solution, taking up 0–10 wt% carbon and 1.7–17 wt% oxygen these have crystallized in the halite (fcc) structure common to synthetic and natural TiN. Nitrides coexisting with silicide melts have higher C/O than those coexisting with silicate melts. Analyses with no carbon fall along the TiN–TiO join in the Ti–N–O phase space, implying that their Ti is a mixture of Ti3+ and Ti2+, while those with 1–3 at.% C appear to be solid solutions between TiN and Ti0.75O. Analyses with at% C have higher Ti2+/Ti3+, reflecting a decrease in fO2. Oxygen fugacity was 6 to 8 log units below the iron–wüstite buffer, at or below the Ti2O3–TiO buffer. These relationships and coexisting silicide phases indicate temperatures of 1400–1100 °C. Ti oxynitrides are probably locally abundant in the upper mantle, especially in the presence of CH4–H2 fluids derived from the deeper metal-saturated mantle.
Condensation and evaporation processes during CB chondrite formation: Insights from Ge isotopes and highly siderophile element abundances
Publisher: Wiley
Date: 06-2021
DOI: 10.1111/MAPS.13698
Abstract: We analyzed the highly siderophile element (HSE) contents and bulk Ge isotopic compositions of large metal grains in the CB chondrites Bencubbin (CB a ), Gujba (CB a ), and HaH 237 (CB b ). Our results suggest that the large grains were formed by the aggregation of smaller condensed grains, and the two Benccubinite groups are distinguishable based on their bulk metal δ 74/70 Ge mass‐dependent isotopic values of 0.99 ± 0.30‰ (CB a ) and −0.65 ± 0.10‰ (CB b ). Based on our observations of these three s les, the isotopic compositions of metal in CB a chondrites are best explained by condensation at slow cooling rates in the center of an impact plume, whereas the metal in CB b chondrites formed under fast cooling rates along the plume edges. We also analyzed the Ge contents and isotopic compositions of the core, intermediate, and rim fractions of two Gujba metal grains, which were separated by sequential digestion. These results show a gradual decrease in δ 74/70 Ge and [Ge] from core to rim. We suggest that these δ 74 Ge zonations result from near‐equilibrium condensation and evaporation processes in a heterogeneous plume. We propose a model for their formation in which (1) small grains (to become grain cores) condensed at equilibrium (2) these grains were transported to a warmer region of the plume where they reached temperatures lower than that of Fe‐Ni condensation, but high enough for the rapid evaporation of Ge (3) Ge evaporation followed by slow cooling enriched the grains in heavy Ge isotopes and the surrounding gas in light Ge isotopes and (4) equilibrium recondensation of metal from the gas and around the small grains formed the light Ge isotopic zonations observed in grain rims.
Mineralogy of carbonaceous chondritic microlasts in howardites: Identification of C2 fossil micrometeorites
Publisher: Elsevier BV
Date: 02-2003
Sulfur Mass Fractions in Thirty‐Seven Geological Reference Materials by Titration, XRF and Elemental Analyser
Publisher: Wiley
Date: 10-02-2023
DOI: 10.1111/GGR.12473
Abstract: Although sulfur is a relatively abundant element, measurement results with small uncertainties remain challenging to achieve, especially at S mass fractions below 100 μg g ‐1 . We report 1700 measurement results of S for thirty‐seven geological reference materials including igneous, metamorphic and sedimentary rocks, and one soil. Measurement results were obtained in two laboratories (Macquarie GeoAnalytical and Géosciences Montpellier) over a long period of time ≈ 25 years (1997–2022), using several measurement procedures: X‐ray fluorescence, high temperature iodo titration and elemental analysers equipped with thermal conductivity and/or infra‐red detectors. Sulfur mass fractions for these erse geological reference materials range between 5.5 and 11,395 μg g ‐1 . While the comprehensive data set reported here should contribute significantly to a better characterisation of the S mass fractions of widely used geological reference materials, computed uncertainties, data distribution and comparison to published values still indicate heterogeneous distribution of S carrier(s) and analytical bias.
The Cu isotopic signature of granites from the Lachlan Fold Belt, SE Australia
Publisher: Elsevier BV
Date: 2009
Volatile fractionation in the early solar system and chondrule/matrix complementarity
Publisher: Proceedings of the National Academy of Sciences
Date: 20-09-2005
Abstract: Bulk chondritic meteorites and terrestrial planets show a monotonic depletion in moderately volatile and volatile elements relative to the Sun's photosphere and CI carbonaceous chondrites. Although volatile depletion was the most fundamental chemical process affecting the inner solar nebula, debate continues as to its cause. Carbonaceous chondrites are the most primitive rocks available to us, and fine-grained, volatile-rich matrix is the most primitive component in these rocks. Several volatile depletion models posit a pristine matrix, with uniform CI-like chemistry across the different chondrite groups. To understand the nature of volatile fractionation, we studied minor and trace element abundances in fine-grained matrices of a variety of carbonaceous chondrites. We find that matrix trace element abundances are characteristic for a given chondrite group they are depleted relative to CI chondrites, but are enriched relative to bulk compositions of their parent meteorites, particularly in volatile siderophile and chalcophile elements. This enrichment produces a highly nonmonotonic trace element pattern that requires a complementary depletion in chondrule compositions to achieve a monotonic bulk. We infer that carbonaceous chondrite matrices are not pristine: they formed from a material reservoir that was already depleted in volatile and moderately volatile elements. Additional thermal processing occurred during chondrule formation, with exchange of volatile siderophile and chalcophile elements between chondrules and matrix. This chemical complementarity shows that these chondritic components formed in the same nebula region.
Nature and Evolution of the Lithospheric Mantle beneath the Hoggar Swell (Algeria): a Record from Mantle Xenoliths
Publisher: Oxford University Press (OUP)
Date: 11-2014
Sulfide aggregation in ophiolitic dunite channels explains Os-isotope mismatch between oceanic crust and mantle
Publisher: Wiley
Date: 10-2020
Chondrule trace element geochemistry at the mineral scale
Publisher: Wiley
Date: 11-2012
DOI: 10.1111/MAPS.12005
Trace element analyses of vigarano chondrules
Publisher: Wiley
Date: 07-2009
A suture related accretionary wedge in the Gondwana assembly: Insights from serpentinites in the Hoggar shield, Algeria
Publisher: Elsevier BV
Date: 02-2022
Taking the pulse of the Earth: linking crustal and mantle events
Publisher: Informa UK Limited
Date: 08-2008
Eruption dynamics of pleistocene maars and tuff rings from the Azrou-Timahdite district (Middle Atlas, northern Morocco) and its relevance to environmental changes and ground water table characteristi
Publisher: Elsevier BV
Date: 07-2020
Related Organisations
E O Lawrence Berkeley National Laboratory
Location: United States of America
Universidade Estadual Paulista Júlio De Mesquita Filho
Location: Brazil
Related Funding Activities
Discovery Projects - Grant ID: DP0770929
Start Date: 2007
End Date: 12-2010
Amount: $690,000.00
Funder: Australian Research Council
View Funded ActivityARC Future Fellowships - Grant ID: FT150100115
Start Date: 03-2016
End Date: 04-2021
Amount: $796,960.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP210102196
Start Date: 12-2021
End Date: 12-2024
Amount: $375,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP0450764
Start Date: 09-2004
End Date: 05-2008
Amount: $360,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP220100709
Start Date: 12-2022
End Date: 11-2025
Amount: $490,000.00
Funder: Australian Research Council
View Funded Activity