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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

Origin of the mass-dependent germanium isotopic continuum in the early Solar System

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Origin of the mass-dependent germanium isotopic continuum in the early Solar System

Béatrice Luais, Guillaume Florin Earth and Planetary Science Letters, 672, 119663 Voir en ligne : https://doi.org/10.1016/j.epsl.2025.119663 The warm, reduced, volatile-poor inner Solar System and cold, oxidized, volatile-rich outer Solar System are characterized by neutron-poor and neutron-rich isotopic anomalies, respectively. Nucleosynthetic isotopic anomalies recorded in meteorites, asteroidal bodies, and planets are thus indicative of their regions of

Characterization of the HIMU Mantle Source from Noble Gas Isotopes in Volcanic Gas Emissions in São Tomé (Cameroon Volcanic Line)

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Characterization of the HIMU Mantle Source from Noble Gas Isotopes in Volcanic Gas Emissions in São Tomé (Cameroon Volcanic Line)

Arno Lastes, David V. Bekaert, Bouchaib Tibari, Alan M. Seltzer, Michael W. Broadley, Peter H. Barry, and Bernard Marty CS Earth and Space Chemistry special issue “Reika Yokochi Memorial” Voir en ligne : https://pubs.acs.org/doi/10.1021/acsearthspacechem.5c00056?ref=pdf The source of volcanism in the Cameroon volcanic line remains unresolved. To better constrain the mantle components involved, we measure light noble

Early Archaean onset of volatile cycling at subduction zones

Dernières publications

Early Archaean onset of volatile cycling at subduction zones

G. Caro, T. Grocolas, P. Bourgeois, P. Bouilhol, S. J. Mojzsis, G. Paris. Nature Geoscience volume 18, pages 436–442 (2025) Voir en ligne : https://doi.org/10.1038/s41561-025-01677-5 Abstract: The subduction of pelagic sediments and altered oceanic crust modulates the global cycle of volatile elements. Sulfate and carbonate fluids released when one plate descends beneath another modify the

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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