A5024085187- Astro and Planetary Science
- Isotope Analysis in Ecology
- Geological and Geochemical Analysis
- Planetary Science and Exploration
- Geology and Paleoclimatology Research
- Nuclear Physics and Applications
- High-pressure geophysics and materials
- Groundwater and Isotope Geochemistry
- Geochemistry and Elemental Analysis
- Analytical chemistry methods development
- Methane Hydrates and Related Phenomena
- Radioactive contamination and transfer
- Trace Elements in Health
- Mass Spectrometry Techniques and Applications
- Geochemistry and Geologic Mapping
- Stellar, planetary, and galactic studies
- Paleontology and Stratigraphy of Fossils
- Radioactive element chemistry and processing
- Pacific and Southeast Asian Studies
- Proteoglycans and glycosaminoglycans research
- Astrophysical Phenomena and Observations
- Geological Studies and Exploration
- Geomagnetism and Paleomagnetism Studies
- Oil Spill Detection and Mitigation
- Geological Formations and Processes Exploration
Institut de physique du globe de Paris
2011-2024
Université Paris Cité
2011-2024
Centre National de la Recherche Scientifique
2011-2024
University of Bristol
2019-2022
Université de Lorraine
2012-2015
Centre de Recherches Pétrographiques et Géochimiques
2011-2015
Sorbonne Paris Cité
2011-2015
Institut National des Sciences de l'Univers
2015
We present a new approach to Cu isotopic measurements using state-of-the-art Nu Sapphire multicollector inductively coupled plasma source mass spectrometer equipped with collision/reaction cell (CRC-MC-ICPMS). investigate the effects of Na doping and concentration mismatch between bracketing standard unknown samples demonstrate efficacy introducing He-H
Early solar materials bear a variety of isotopic anomalies that reflect compositional differences deriving from distinct stellar nucleosynthetic processes. As shown in previous studies, the stepwise dissolution with increasing acid strengths bulk rock carbonaceous chondrites liberates Cr both excesses and deficits 53Cr 54Cr relative to terrestrial standard. The magnitude variations within meteorite decreases sequence CI1 > CR2 CM2 CV3 CO3 CK4 correlates degree metamorphism each chondrite...
Abstract Aging is the main risk factor for Alzheimer's disease (AD). AD linked to alterations in metal homeostasis and changes stable isotopic composition can occur, possibly allowing latter serve as relevant biomarkers potential diagnosis. Copper isotopes are used investigate Cu associated with various diseases. Prior work has shown that mouse models, accumulation of 63Cu brain disease's progression. However, our understanding how normal aging process influences brain's copper remains...
Significance Combining bulk and in situ Mg isotope measurements allows dating the formation of chondrule precursors relative to that chondrules themselves. This has never been achieved before profound implications for origin chondrules, their precursors, evolution solar protoplanetary disk. There is a minimum isochron, analogous some ways calcium−aluminum-rich inclusion which dates either cessation condensation or transport regions where formed.
Understanding the spatial variability of initial 26Al/27Al in solar system, i.e., (26Al/27Al)0, is prime importance to meteorite chronology, planetary heat production, and protoplanetary disc mixing dynamics. The (26Al/27Al)0 calcium-aluminum-rich inclusions (CAIs) primitive meteorites (~5 × 10-5) frequently assumed reflect entire disc, predicts its 26Mg/24Mg be ~35 parts per million (ppm) less radiogenic than modern Earth (i.e., Δ'26Mg0 = -35 ppm). Others argue for spatially heterogeneous...
This paper reports measurements of mass-independent and mass-dependent Ca isotope variations using the prototype collision cell MC-ICPMS/MS, Proteus. Helium hydrogen gases are introduced into well characterised resonant charge exchange proton transfer reactions between Ar+ ions H2 molecules results in almost complete removal 40Ar+ allowing measurement 40Ca by MC-ICPMS without resorting to 'cold' plasma. A range reference materials have been for both their compositions relative international...
The possibility of establishing an accurate relative chronology the early solar system events based on decay short-lived 26Al to 26Mg (half-life 0.72 Myr) depends level homogeneity (or heterogeneity) and Mg isotopes. However, this is difficult constrain precisely because very high precision needed for determination isotopic ratios, typically ±5 ppm. In study, we report first time a detailed analytical protocol developed in situ measurements (25Mg/24Mg 26Mg/24Mg as well excess) by MC-SIMS. As...
This study demonstrates that silicon isotope measurement under wet plasma shows larger tolerance to sample-based matrix effects caused by anions and dissolved organic carbon compared dry plasma.
Chemical weathering of silicate rocks is a key control on the long-term climate, via drawdown atmospheric CO2. Magnesium isotopes are increasingly being used to trace weathering, but often complicated by several coincident fractionating processes. Here we examine Mg isotope ratios waters stemming from beneath lava flows 2010 Eyjafjallajökull eruption. Travertine calcite was observed directly precipitating these high-TDS (total dissolved solids) waters, and were also sampled. This system...
Techniques for the determination of radiogenic strontium (87Sr/86Sr) and neodymium (143Nd/144Nd) isotope ratios by Thermal Ionisation Mass Spectrometry (TIMS) are presented in this study. We have developed a 5 lines acquisition routine both elements, taking advantage 16 Faraday cups available on Nu Instruments TIMS conjunction with an efficient zoom lens system. This allows increased flexibility regarding number multidynamic whilst maintaining optimal peak alignment shape every measurement...
Intraplate volcanism provides remarkable insight into diverse sources in the mantle because its source can be quite shallow, or as deep core-mantle boundary, and origin recycled crustal material undifferentiated mantle. While geophysical approaches some cases locate of magmas, a geochemical approach is necessary to characterize both nature way it melts produce erupted lavas. Here we present isotopic data obtained on new submarine volcano (Fani Maoré) that was discovered 2019 next Mayotte...