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Olivines in main-group pallasites: magma-ocean cumulates or partial melting residues? ArchiMer
Barrat, Jean-alix; Ferrière, L..
Main-group pallasites (MGPs) are meteorites mainly composed of Fe-Ni metal and olivines, the latter being considered as one of the largest sampling of extraterrestrial mantle material available for study on Earth. We analysed the rare earth element (REE) concentrations of olivines from six MGPs to understand better the processes of formation of their parent mantle. All the investigated samples display very low REE abundances, and enrichments in both light REEs and heavy REEs. We interpret the light REE enrichments as a fingerprint of terrestrial contamination. The least contaminated olivines have higher heavy REE enrichments than those inferred for olivines directly crystallised in a magma ocean. Such enrichments in heavy REEs are possible if the mantle of...
Tipo: Text Palavras-chave: Pallasite; Early solar system; Trace elements; Rare earth elements; Differentiation.
Ano: 2021 URL:
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