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

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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

Hidden Early Clinopyroxene Relicts Record Reactive Porous Flow in Oceanic Plutonic Series

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Hidden Early Clinopyroxene Relicts Record Reactive Porous Flow in Oceanic Plutonic Series

Falc’Hun C., France L. Journal of Petrology, 2026, 67, egag004 Voir en ligne : https://doi.org/10.1093/petrology/egag004 Almost two-thirds of the Earth’s magmatic budget is concentrated at mid-ocean ridges, with 85% of this being emplaced as intrusive rocks. In these systems, now understood to consist mostly of a crystal-dominated igneous medium (mush), melt differentiation at depth is predominantly

H-N budgets and isotopic signatures of Oued Chebeika 002 and CI reservoir heterogeneity

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H-N budgets and isotopic signatures of Oued Chebeika 002 and CI reservoir heterogeneity

Marrocchi Y., Füri E., Zimmermann L. & Piani L. Geochemical Perspective Letters, 39, 7-11, 10.7185/geochemlet.2605 Voir en ligne : https://doi.org/10.7185/geochemlet.2605 We report the hydrogen (H) and nitrogen (N) elemental and isotopic compositions of the recently recovered CI chondrite Oued Chebeika 002 (OC 002) and compare them with published data for other CI meteorites and CI-like samples

Oxygen isotope compositions of chondrules in enstatite chondrites: insights from relict olivine, chondrule size and redox state

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Oxygen isotope compositions of chondrules in enstatite chondrites: insights from relict olivine, chondrule size and redox state

Marrocchi Y., Piani L., Thomassin D. & Jacquet E. (2026) Geochimica et Cosmochimica Acta 414, 62-74, 10.1016/j.gca.2025.12.036 Voir en ligne : https://doi.org/10.1016/j.gca.2025.12.036 The recent discovery in ordinary chondrites of a population of small, sub-TFL (i.e., negative Δ17O; TFL = Terrestrial Fractionation Line) chondrules isotopically similar to relict grains in larger chondrules offered a glimpse into the

Demantoid garnet deposits: review and geological classification

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Demantoid garnet deposits: review and geological classification

Gaston Giuliani, Isabella Pignatelli, Julien Feneyrol, Anthony E. Fallick, Alfred Andriamamonjy The Canadian Journal of Mineralogy and Petrology (2025) 63 (5): 421–465. Voir en ligne : https://doi.org/10.3749/2500010 The aim of this extended review and update is to present the state-of-the-art on the geology and gemology of the demantoid variety of andradite garnet. A number of studies

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Magmas
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Tectonics, Erosion and the Evolution of Relief

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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