A5023435534- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- earthquake and tectonic studies
- Geochemistry and Geologic Mapping
- Geology and Paleoclimatology Research
- Paleontology and Stratigraphy of Fossils
- Geological Studies and Exploration
- Isotope Analysis in Ecology
- Astro and Planetary Science
- Advanced NMR Techniques and Applications
- Diamond and Carbon-based Materials Research
- Methane Hydrates and Related Phenomena
- Nuclear Physics and Applications
- Geological and Geophysical Studies Worldwide
- Hydrocarbon exploration and reservoir analysis
- Ion-surface interactions and analysis
- Pleistocene-Era Hominins and Archaeology
- NMR spectroscopy and applications
- Geomagnetism and Paleomagnetism Studies
- Groundwater and Isotope Geochemistry
- Geological and Geophysical Studies
- Mass Spectrometry Techniques and Applications
- Tree-ring climate responses
- Planetary Science and Exploration
- Advanced MRI Techniques and Applications
Université de Lorraine
2014-2023
Centre de Recherches Pétrographiques et Géochimiques
2012-2022
Centre National de la Recherche Scientifique
2004-2022
University of Cape Town
2021
Géosciences Montpellier
2019-2021
ETH Zurich
2019-2020
Université de Montpellier
2020
Institut de physique du globe de Paris
2004-2019
McGill University
2007-2019
Board of the Swiss Federal Institutes of Technology
2019
Primarily on the basis of C, N, S, and O stable isotope systematics, this article reviews recent achievements in understanding diamond formation growth Earth's mantle. Diamond is a metasomatic mineral that results from either reduction or oxidation mobile C-bearing liquids (fluids melts) intrude preexisting lithologies (eclogites, peridotites, metamorphic rocks). This process seems ubiquitous, as it occurs over large range depths extends through time. Diamond-forming carbon derives mainly...
The isotopic diversity of oceanic island basalts (OIB) is usually attributed to the influence, in their sources, ancient material recycled into mantle, although nature, age, and quantities this remain controversial. unradiogenic Pb isotope signature enriched mantle I (EM I) source from, for example, Pitcairn or Walvis Ridge has been variously pelagic sediments, lower continental crust, subcontinental lithosphere. Our study helps resolve debate by showing that lavas contain sulfides whose...
Subsurface habitats on Earth host an extensive extant biosphere and likely provided one of Earth's earliest microbial habitats. Although the site life's emergence continues to be debated, evidence early life provides insights into its evolution metabolic affinity. Here, we present discovery exceptionally well-preserved, ~3.42-billion-year-old putative filamentous microfossils that inhabited a paleo-subseafloor hydrothermal vein system Barberton greenstone belt in South Africa. The filaments...
Significance Sulfur isotopes in ancient Earth sediments have peculiar compositions resulting from photochemical reactions of sulfur-bearing gaseous species with UV photons the anoxic early Earth's atmosphere. High-precision measurements distinct localities revealed that these isotopic anomalies are sensitive to abundances atmospheric gases. They thus appear as promising metrics composition. In present study, we focus on origin and extent this memory. We analyzed multiple S-isotope some...
Secondary ion mass spectrometry (SIMS) is a powerful technique for in situ triple oxygen isotope measurements that has been used more than 30 years. Since pioneering works performed on small-radius microprobes the mid-80s, tremendous progress made terms of analytical precision, spatial resolution and analysis duration. In this respect, emergence mid-90s large-radius microprobe equipped with multi-collector system (MC-SIMS) was game changer. Further developments achieved CAMECA MC-SIMS since...
Research Article| April 25, 2019 Extreme δ18O signatures in zircon from the Saglek Block (North Atlantic Craton) document reworking of mature supracrustal rocks as early 3.5 Ga Adrien Vezinet; Vezinet 1Earth and Atmospheric Sciences, University Alberta, Edmonton, Alberta T6G 2E3, Canada Search for other works by this author on: GSW Google Scholar Emilie Thomassot; Thomassot 2Centre de Recherches Pétrographiques et Géochimiques, UMR 7358, Université Lorraine, CNRS, 54500 Vandoeuvre-lès-Nancy,...
Re-Os isotope systematics are reported from a suite of eclogitic and websteritic sulphide inclusions extracted well-characterised diamond growth zones the Orapa Jwaneng kimberlite clusters. ages (786 ± 250 Ma) within uncertainty previously determined Sm-Nd (853 55 Ma), demonstrating isotopic equilibrium, at varying levels completeness, across multiple systems in different minerals time formation inclusion encapsulation. These data confirm concept that isochron ages, when used with detailed...
Abstract The Sm–Nd isotope systematics and geochemistry of eclogitic, websteritic peridotitic garnet clinopyroxene inclusions together with characteristics their corresponding diamond hosts are presented for the Letlhakane mine, Botswana. These data supplemented new inclusion from nearby (20–30 km) Orapa Damtshaa mines to evaluate nature scale diamond-forming processes beneath NW part Kalahari Craton provide insight into evolution deep carbon cycle. compositions indicate five well-defined,...
Calcium oxalate minerals of the general formula CaC