A5102886802- Geological and Geochemical Analysis
- Astro and Planetary Science
- Glass properties and applications
- High-pressure geophysics and materials
- Geology and Paleoclimatology Research
- Planetary Science and Exploration
- Mineralogy and Gemology Studies
- earthquake and tectonic studies
- Metallurgy and Cultural Artifacts
- Archaeology and ancient environmental studies
- Hydrocarbon exploration and reservoir analysis
- Isotope Analysis in Ecology
- Cyprus History, Politics, Society
- Clay minerals and soil interactions
- Post-Soviet Geopolitical Dynamics
- Methane Hydrates and Related Phenomena
- Geochemistry and Geologic Mapping
- Material Dynamics and Properties
- Radioactive element chemistry and processing
- Ancient and Medieval Archaeology Studies
- Building materials and conservation
- Geomagnetism and Paleomagnetism Studies
- Geological formations and processes
- Geochemistry and Elemental Analysis
- Cultural Heritage Materials Analysis
Sorbonne Université
2004-2022
Centre National de la Recherche Scientifique
1997-2022
Sorbonne Paris Cité
1978-2022
Géoazur
1978-2022
Université Côte d'Azur
2022
Institut de Recherche pour le Développement
2022
Institut de minéralogie, de physique des matériaux et de cosmochimie
2017
Institut des Sciences de la Terre de Paris
2011-2016
Institut de physique du globe de Paris
2009
Université de Bretagne Occidentale
2006
Tracer diffusivity of Na, K, Rb, Cs, Ca, Sr, Ba, Eu, and Ce has been measured in natural dehydrated obsidians the range 300°–1300°C, 0–4 kbar, using radiotracers an etching technique. The results complement extend previous on similar material. Diffusivity ranging from 10 −16 to −7 cm 2 /s have observed. An Arrhenius law is observed for all species, with activation energies E 20 120 kcal/mol. A strong correlation ionic radius squared formal charge (Z ) offers guidelines model calculation...
Asteroidal material, delivered to Earth as meteorites, preserves a record of the earliest stages planetary formation. High-precision oxygen isotope analyses for two major groups stony-iron meteorites (main-group pallasites and mesosiderites) demonstrate that each group is from distinct asteroidal source. Mesosiderites are isotopically identical howardite-eucrite-diogenite clan and, like them, probably derived asteroid 4 Vesta. Main-group represent intermixed core-mantle material single...
The earliest known iron artefacts are nine small beads securely dated to circa 3200 BC, from two burials in Gerzeh, northern Egypt. We show that these were made meteoritic iron, and shaped by careful hammering the metal into thin sheets before rolling them tubes. study demonstrates ability of neutron X-ray methods determine nature material even after complete corrosion metal. strung a necklace together with other exotic minerals such as lapis lazuli, gold carnelian, revealing status special...
The concentrations and isotopic compositions of helium, neon, argon were measured in 29 water samples collected from five superposed aquifers the Paris Basin (Ypresian, Albian, Neocomian, Dogger, Trias). In all these groundwater flow systems data showed excesses 3 He, 4 40 Ar above solubility equilibrium with atmosphere (air saturated (ASW)), as well vertical concentration gradients isotopes throughout basin. Dogger Trias formations also had a 21 Ne excess ASW values. mean rate radiogenic...
Abstract— We report on the discovery of a new shergottite from South Morocco. This single stone weighing 320 g is referenced as Northwest Africa (NWA) 856 with Djel Ibone synonymous name. It fresh, fine‐grained basaltic rock consisting mainly two pyroxenes (total ˜68 vol%: 45% pigeonite, En 61‐16 Wo 9–22 Fs 26–68 ; 23% augite, 46‐26 34‐29 21–43 ) and plagioclase converted to maskelynite (˜23 vol%, Ab 43–57 Or 1–5 An 54‐36 ). Accessory minerals include merrillite, Cl‐apatite, pyrrhotite,...
Abstract— North West Africa (NWA) 480 is a new martian meteorite of 28 g found in the Moroccan Sahara November 2000. It consists mainly large gray pyroxene crystals (the largest grains are up to 5 mm length) and plagioclase converted maskelynite. Excluding melt pocket areas, modal analyses indicate following mineral proportions: 72 vol% pyroxenes extensively zoned, 25% maskelynite, 1% phosphates (merrillite chlorapatite), opaque oxides (ilmenite, ulvöspinel chromite) sulfides, others such as...