A5005884612- Astro and Planetary Science
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Planetary Science and Exploration
- Paleontology and Stratigraphy of Fossils
- Geochemistry and Elemental Analysis
- Isotope Analysis in Ecology
- earthquake and tectonic studies
- Analytical chemistry methods development
- Methane Hydrates and Related Phenomena
- Characterization and Applications of Magnetic Nanoparticles
- Geochemistry and Geologic Mapping
- Extraction and Separation Processes
- Cold Fusion and Nuclear Reactions
- Iron Metabolism and Disorders
- Astronomical and nuclear sciences
- Geological and Geophysical Studies
- Hemoglobinopathies and Related Disorders
- Geology and Paleoclimatology Research
- Trace Elements in Health
- Mass Spectrometry Techniques and Applications
- Geochemistry and Geochronology of Asian Mineral Deposits
Institut de physique du globe de Paris
2018-2024
Université Paris Cité
2018-2024
Centre National de la Recherche Scientifique
2021-2024
University of Bayreuth
2022-2023
Sorbonne Paris Cité
2018
Nitrogen (N) is the most abundant element in Earth's atmosphere, but extremely depleted silicate Earth. However, it not clear whether core sequestration or early atmospheric loss was responsible for this depletion. Here we study effect of formation on inventory nitrogen using laser-heated diamond anvil cells. We find that, due to simultaneous dissolution oxygen metal, N becomes much less siderophile (iron-loving) at pressures and temperatures up 104 GPa 5000 K, a thermodynamic condition...
Nitrogen (N) is the most abundant element in Earth's modern atmosphere, but extremely depleted silicate crust and mantle. The volatile inventory of bulk Earth shows a well-established N deficit compared to CI chondrites, primitive meteorites representative solar composition. However, it remains unclear whether formation iron-rich core, early atmospheric loss, or combination both was responsible for this depletion, partly due large extrapolation from low-pressure experiments. Here, we study...
We report high precision Sn isotopic compositions, expressed as δ 122/118 relative to the NIST3161a standard, for fine grained matrix of 24 glacial diamictite composites.The diamictites were deposited from Mesoarchean Palaeozoic and sampled four continents (Africa, Asia, North South America).They are relatively homogeneous in Sn, ranging 0.15 0.32 ‰ with an average value 0.22 ± 0.14 (2 s.d., n = 24).The composition is not influenced by chemical weathering, depositional age, geographic...
The development of collision-cell multi-collection inductively-coupled-plasma mass-spectrometers has revolutionized K isotope chemistry, improving the sensitivity by over a factor 10 compared to that older generation instruments.
FeNi metals represent an important fraction of chondritic components that remains relatively unexplored within most carbonaceous chondrite groups. The compositions these can place constraints on the nature their precursor materials as well physicochemical conditions chondrule formation. In this study, we have analyzed major, minor and trace element metal grains from unaltered chondrites NWA 801 (CR), Leoville (CV3.1), Paris (CM2.9), Maribo (CM2.8) Bells (CM-an). We observe a predominant...
Abstract Identifying extant materials that act as compositional proxies for Earth is key to understanding its accretion. Copper and sulfur are both moderately volatile elements; however, they display different geochemical behavior (e.g., phase affinities). Thus, individually together, these elements provide constraints on the source material conditions of Earth's accretion, well timing evolution delivery Earth. Here we present laser‐heated diamond anvil cell experiments at pressures up 81...
Abstract Earth's accretion history for volatile elements, and the origin of their depletions with respect to Sun primitive meteorites, continue be debated. Two end‐member scenarios propose either that elements were delivered during main phases differentiation, or Earth accreted from materials largely devoid volatiles late addition volatile‐rich materials. Experiments evaluating effect metal–silicate equilibrium on elemental isotopic distribution siderophile such as Sn can help distinguish...
Iron isotopes are fractionated by multiple biological processes, which offers a novel opportunity to study iron homeostasis. The determination of Fe isotope composition in samples necessitates certified reference materials with known isotopic signature order properly assess external reproducibility and data quality between laboratories. We report the most comprehensive on for widely available international materials. They consist different terrestrial marine animal organs (bovine, porcine,...
The Fe isotopic compositions of planetary mantles differentiated inner solar system bodies exhibit a variability which the origin is debated.The Earth and Moon have heavierthan-chondritic signatures with respect to other (e.g.Mars, Vesta) that chondritic [1].Several processes could account for this variability, including volatile loss upon giant impacts, accretion various degrees nebular post-nebular in building blocks, disproportionation 2+ into 3+ metallic by bridgmanite crystallisation...
Primitive achondrites are partially differentiated meteorites originating from parent bodies that accreted around 1.3 Myr after CAIs [1].Despite a limited heating potential (up to ≈ 1200 °C and 25 vol% of melting for lodranites [2]), the silicate fraction these specimens shows high degree equilibration, based on homogeneous phase compositions equilibrated textural features.However, textures opaque phases in acapulcoites do not reflect an equilibrium defined by interfacial energies.At peak...
Based on the isotopic anomalies of non-volatile elements such as Ti, Cr, Mo, and Ru, Solar System materials have been classified into two reservoirs: non-carbonaceous (NC) carbonaceous (CC) [1,2].Recently, a moderately volatile element, Zn, also identified.Researchers discovered that CC NC chondrites form distinct reservoirs [3,4], with having positive ε 66 Zn negative compared to Earth (ε Zn=0).Here, is per ten thousand deviation Zn/ 64 ratio normalized 68 0.3856.These used uncover origin...
The Fe isotopic compositions of mantles differentiated inner solar system bodies exhibit a variability-δ 56 between 0.00 and 0.12‰ in terrestrial planetary mantles-of which the origin is debated.The Earth Moon have heavier-thanchondritic signatures with respect to other (e.g.Mars, Vesta) that chondritic [1].Several processes could account for this variability, including volatile loss upon giant impacts, accretion various degrees nebular post-nebular building blocks, disproportionation 2+...