A5066859290- Geological and Geochemical Analysis
- Geochemistry and Geologic Mapping
- earthquake and tectonic studies
- High-pressure geophysics and materials
- Geological and Geophysical Studies
- Paleontology and Stratigraphy of Fossils
- Geology and Paleoclimatology Research
- Planetary Science and Exploration
- Mineralogy and Gemology Studies
- Geochemistry and Elemental Analysis
- Methane Hydrates and Related Phenomena
- Marine and environmental studies
- Metal Extraction and Bioleaching
- Geological Studies and Exploration
- Material Science and Thermodynamics
- Astro and Planetary Science
- Geomagnetism and Paleomagnetism Studies
- Radioactive element chemistry and processing
- Hydrocarbon exploration and reservoir analysis
- Recycling and utilization of industrial and municipal waste in materials production
- Chemical and Physical Properties in Aqueous Solutions
- Magnesium Oxide Properties and Applications
- Iron and Steelmaking Processes
- X-ray Spectroscopy and Fluorescence Analysis
- Crystal Structures and Properties
Géosciences Environnement Toulouse
2016-2025
Centre National de la Recherche Scientifique
2016-2025
Université Toulouse III - Paul Sabatier
2010-2025
Institut de Recherche pour le Développement
2013-2025
Université de Toulouse
2013-2025
Institute of Geological Sciences
2024
Observatoire Midi-Pyrénées
2014-2024
Moscow State Open University
2023
Peter the Great St. Petersburg Polytechnic University
2023
Lomonosov Moscow State University
2012-2021
Abstract This contribution provides an overview of available experimental, thermodynamic, and molecular data on Au aqueous speciation, solubility, partitioning in major types geological fluids the Earth's crust, from low-temperature solution to supercritical hydrothermal-magmatic fluids, vapours, silicate melts. Critical revisions these allow generation a set thermodynamic properties AuOH, AuCl − 2 , AuHS, Au(HS) complexes dominant hydrothermal solutions; however, other involving different...
Research Article| January 01, 2013 Speciation and Transport of Metals Metalloids in Geological Vapors Gleb S. Pokrovski; Pokrovski * 1Géosciences Environnement Toulouse, GET-UMR5563, Observatoire Midi-Pyrénées, Université de CNRS-IRD-OMP,14 Av. E. Belin, F-31400 France *gleb.pokrovski@get.obs-mip.fr; glebounet@gmail.com Search for other works by this author on: GSW Google Scholar Anastassia Y. Borisova; Borisova France2Geological Department, Moscow State University, Leninskie Gory, Moscow,...
Significance Gold resources on Earth result from an exceptional concentration phenomenon yielding metal contents in ore a thousand to million times higher than those common rocks. We show that this process is controlled by sulfur radical ions ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:msubsup> <mml:mtext>S</mml:mtext> <mml:mn>3</mml:mn> <mml:mo>−</mml:mo> </mml:msubsup> </mml:mrow> </mml:math> ), which strongly bind Au aqueous solution at...
Research Article| March 01, 2014 Formation and Deformation of Pyrite Implications for Gold Mineralization in the El Callao District, Venezuela German Velásquez; Velásquez 1Universidad Central de Venezuela, Instituto Ciencias la Tierra, Avenida Los Ilustres, Chaguaramos, Caracas 3895, Venezuela2Université Toulouse, CNRS, Géosciences Environnement Institut Recherche pour le Développement, Observatoire Midi-Pyrénées, 14 Av. Edouard Belin, F-31400 France Search other works by this author on: GSW...
To decipher the petrogenesis of chromitites from Moho Transition Zone Cretaceous Oman ophiolite, we carried out detailed scanning electron microscope and microprobe investigations ∼500 silicate chromite inclusions their hosts, oxygen isotope measurements seven olivine fractions nodular, disseminated, stratiform ore bodies associated host dunites Maqsad area, Southern Oman. The results, coupled with laboratory homogenization experiments, allow several multiphase microcrystal types...
Abstract Granitic pegmatites are exceptional igneous rocks and the possible role of an immiscibility process in their origin is strongly debated. To investigate metal metalloid behaviour hydrous peraluminous systems (aluminium saturation index, ASI >1), we analysed 15 quartz-hosted primary melt fluid inclusions from Ehrenfriedersdorf Complex (Erzgebirge, Germany) 26 leucogranites district (Germany), Kymi (Finland) Erongo (Namibia) by femtosecond laser ablation inductively coupled plasma...
Current knowledge of sulfur behaviour in magmas is based exclusively on ex situ analyses.Here we report the first measurement speciation and partitioning between coexisting aqueous fluids silicate melts.These data were acquired using Raman spectroscopy a diamond anvil cell at 700 °C, 0.3-1.5 GPa, oxygen fugacity vicinity sulfide-sulfate transition, conditions relevant to subduction zone magmatism.Results show that sulfate sulfide are dominant studied systems, together with S •- 3 2 radical...
Despite the ubiquity of arsenic in hydrothermal-magmatic environments, its abundance, distribution, and chemical structural status natural silicate melts glasses remain poorly known. Here we report first situ measurements redox state molecular structure As, using X-ray absorption fine (XAFS) spectroscopy, a rhyolitic peraluminous glass from Macusani (SE Peru) that is representative anatectic derived metasedimentary crustal protoliths. Arsenic abundances as well concentrations other trace...
Zircon is the most frequently used mineral for dating terrestrial and extraterrestrial rocks. However, system of zircon in mafic/ultramafic melts has been rarely explored experimentally existing models based on felsic, intermediate and/or synthetic systems are probably not applicable prediction survival shallow asthenosphere. In order to determine stability such natural systems, we have performed high-temperature experiments dissolution mid-ocean ridge basaltic haplobasaltic coupled with...
Significance Platinum group elements (PGE) are highly valued by many industrial applications, serve as important geochemical tracers of planetary processes, and among eagerly sought natural resources critical trace metals. We show here that aqueous sulfur-bearing fluids play a far more role than believed in technological processes which PGE involved. This is essentially ensured the radical sulfur ion S 3 •− forms extremely stable soluble complexes with both Pt II IV . By enabling enhanced...
Key Points An analytical strategy for determining boron isotope ratios in Ca‐amphiboles using LA‐MC‐ICP‐MS is presented. Accurate δ 11 B results can be achieved the USGS BHVO‐2G glass as calibrating reference material. Two proposed Ca‐amphibole RMs exhibit good homogeneity with intermediate measurement precision of 2.86‰ and 3.96‰ (2 s ).
The debate about early Earth differentiation focuses on the processes responsible for formation of protocrust(s) and continental crust felsic (SiO 2 ≥ 55 weight %) composition. One aspect this is how Hadean zircons fit into an ultramafic environment. On basis experiments, thermodynamic modeling, elemental partitioning, we show that melts could have been generated by shallow interaction between primordial serpentinized peridotite basaltic magmas Mars. hafnium isotopic evolution detrital...
In this work we investigate the olivine-phyric basalt suite of Aphanasey Nikitin Rise, an intraplate volcanic structure formed during Late Cretaceous in Indian Ocean. The parental melt has a hypersthene-normative tholeiitic composition with low H2O content (0·3–0·5 wt %) and high SiO2/Al2O3 (3·5). is characterized by Nb, Ta, Th U depletion, uniquely 206Pb/204Pb 143Nd/144Nd among basalts Our modelling demonstrates that fractional crystallization depleted mantle-derived lower continental crust...
Abstract Hadean zircons, from the Jack Hills (Western Australia) and other localities, are currently only window into earliest terrestrial felsic crust, formation of which remains enigmatic. Based upon new experimental results, generation such early crust has been hypothesized to involve partial melting hydrated peridotite interacting with basaltic melt at low pressure (&lt;10 km), but it yet be demonstrated that liquids can indeed crystallize zircons comparable zircon. We used...
The main constituent of the planetary lithosphere is dominant silicate mineral, olivine α-(Mg,Fe)2SiO4, which, along with associated minerals and olivine-hosted inclusions, records physical–chemical conditions during crystal growth transport to surface. However, there a lack information regarding kinetic factors that regulate melt–rock, fluid–rock, magma–rock interactions. Here, we conducted an experimental reaction between hydrated peridotite rock basaltic melt coupled this structural...
This paper reports on the application of variants LA‐ICP‐MS – including infrared femtosecond laser ablation (fs‐LA) inductively coupled plasma‐quadrupole mass spectrometry (ICP‐QMS) and nanosecond (ns‐LA) with single‐collector sector‐field (SF‐) ICP‐MS to in situ determination trace elements different splits reference material (RM) ATHO‐G (MPI‐DING). Analyses materials performed by fs‐ ns‐LA‐ICP‐MS demonstrated efficiency techniques typical accuracy at a level ≤ ± 20%. One ‘anomalous’ split,...
To constrain the temporal evolution of fluid‐magma system responsible for 2010 Eyjafjallajökull eruption (20 March to 20 May, 2010, Southern Iceland), we investigated volatile, major, trace element, and Sr‐Nd‐Pb isotopic compositions bulk lapilli ash samples representing different stages eruption. In addition, analyzed leachates volcanic plume‐derived aerosols sampled over Europe in early May 2010. Available remote‐sensing data total mass SO 2 liberated eruption, together with obtained this...