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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

Hommage à Kuppusami Govindaraju

C’est avec une profonde tristesse que les membres du CRPG ont appris le décès de Kuppusami Govindaraju, affectueusement appelé « Raj » par ses collègues scientifiques en France et dans le monde entier, survenu en janvier dernier. Figure majeure de la géoanalytique, Raj a joué un rôle déterminant — et sans doute prééminent en Europe

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

Formation conditions and chemical composition of early-condensed olivine in the solar protoplanetary disk

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Formation conditions and chemical composition of early-condensed olivine in the solar protoplanetary disk

Elian Ochem , Yves Marrocchi Icarus 445, 116859, 10.1016/j.icarus.2025.116859 Voir en ligne : https://doi.org/10.1016/j.icarus.2025.116859 The dynamic evolution of the solar protoplanetary disk led to the formation of the first solar system solids by condensation, among which amoeboid olivine aggregates (AOAs) are the most abundant. The conditions under which AOAs formed remain poorly constrained, with both equilibrium

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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

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