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Experimental constraints on germanium diffusivity in metal and silicate phases during core formation of planetesimals and terrestrial planets

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Experimental constraints on germanium diffusivity in metal and silicate phases during core formation of planetesimals and terrestrial planets

Baptiste Le Bellego, Celia Dalou, Béatrice Luais, Pierre Condamine, Vincent Motto-Ros, Laurent Tissandier Geochimica et Cosmochimica Acta 422: 397-411 Voir en ligne : https://doi.org/10.1016/j.gca.2025.11.038 The segregation of metallic cores from silicate mantles during early planetary differentiation is a key process shaping the chemical evolution of terrestrial bodies. A critical factor controlling metal-silicate equilibration during this stage

Nitrogen isotopic variations in the early Solar System recorded by pallasites

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Nitrogen isotopic variations in the early Solar System recorded by pallasites

J. Gamblin, E. Füri, B. Luais, L. Zimmermann Geochemical Perspectives Letters v39 Voir en ligne : https://doi.org/10.7185/geochemlet.2607 To gain new insights into nitrogen (N) isotopic variations in the early Solar System, N and noble gas (Ne, Ar) isotopes were measured in metal fragments and olivine separates from thirteen pallasites and five IIIAB iron meteorites. While δ15N

Reactivation of a transcrustal plumbing system during a rifting event (Asal Rift, Djibouti)

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Reactivation of a transcrustal plumbing system during a rifting event (Asal Rift, Djibouti)

Juliette Pin, Lydéric France, Gilles Chazot, Etienne Deloule, Mohamed Ahmed Daoud, Bernard Le Gall Geology (2026) 54 (4): 348–353. Voir en ligne : https://doi.org/10.1130/G53776.1 Magmatism plays a central role in rift dynamics, yet the structure and evolution of magma plumbing systems during continental break-up remain poorly constrained. The Afar Rift offers a rare opportunity to study

A fast double-stack chromatographic separation of germanium from silicate material for isotope analysis with MC-ICP-MS

Dernières publications

A fast double-stack chromatographic separation of germanium from silicate material for isotope analysis with MC-ICP-MS

Qasid Ahmad, Damien Cividini & Béatrice Luais Journal of Analytical Atomic Spectrometry, 41(3), 935–941 Voir en ligne : https://doi.org/10.1039/D5JA00471C Germanium (Ge) isotope measurements (δ74/70Ge relative to NIST3120a) have attracted increasing attention in geochemistry and cosmochemistry; however, analyses of silicate material with low Ge contents remain difficult due to complex sample preparation and purification procedures. Here, we

The importance of considering temperature- and composition-dependent partition coefficients in differentiation models

Dernières publications

The importance of considering temperature- and composition-dependent partition coefficients in differentiation models

Toussaint A., France L. Lithos, Volumes 522–523, February 2026, 108395 Voir en ligne : https://doi.org/10.1016/j.lithos.2025.108395 Quantifying the parameters that govern magma differentiation is key to understanding the evolution of igneous systems. We present an approach combining thermodynamic modeling of magma differentiation using Rhyolite-MELTS with chemical composition, temperature, pressure, and oxygen fugacity (X-T-P-fO2)-dependent partition coefficients (D) for

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Our research themes

Cosmochemistry and Planetology

Cycles, Atmosphere, Climates

Magmas
and Deep Fluids

Tectonics, Erosion and the Evolution of Relief

OUR NATIONAL FACILITIES

LG-SIMS-Nancy

Ion microprobes

SARM

Service d’Analyse des Roches
et des Minéraux

Our instrumental Facilities

Noble gas mass spectrometry

Radiogenic & Stable isotopes - Mass Spectrometry

Stable isotopes mass spectrometry

Experimental Cosmochemistry and Magmatology

Scanning electron microscope and microprobe

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Les FEDER CRISTMAG et STEHLo sont cofinancés par l’Union européenne dans le cadre du Programme opérationnel FEDER-FSE Lorraine et Massif des Vosges 2014-2020.

Our research themes

Cosmochemistry and Planetology

Cycles, Atmosphere, Climates

Magmas and Deep Fluids

Tectonics, Erosion and the Evolution of Relief

OUR NATIONAL FACILITIES

LG-SIMS-Nancy

SARM

Our instrumental Facilities

Noble gas mass spectrometry

Radiogenic & Stable isotopes - Mass Spectrometry

Stable isotopes mass spectrometry

Experimental Cosmochemistry and Magmatology

Scanning electron microscope and microprobe

OUR EDUCATIONAL PARTNERS

OUR NETWORKS & FINANCIAL PARTNERS

Magmas
and Deep Fluids