Reconciling metal–silicate partitioning and late accretion in the Earth

Terry-Ann Suer (), Julien Siebert, Laurent Remusat, James M. D. Day, Stephan Borensztajn, Beatrice Doisneau and Guillaume Fiquet
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Terry-Ann Suer: Sorbonne Université
Julien Siebert: Institut de Physique du Globe de Paris, UMR CNRS 7154
Laurent Remusat: Sorbonne Université
James M. D. Day: Harvard University
Stephan Borensztajn: Institut de Physique du Globe de Paris, UMR CNRS 7154
Beatrice Doisneau: Sorbonne Université
Guillaume Fiquet: Sorbonne Université

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract Highly siderophile elements (HSE), including platinum, provide powerful geochemical tools for studying planet formation. Late accretion of chondritic components to Earth after core formation has been invoked as the main source of mantle HSE. However, core formation could also have contributed to the mantle’s HSE content. Here we present measurements of platinum metal-silicate partitioning coefficients, obtained from laser-heated diamond anvil cell experiments, which demonstrate that platinum partitioning into metal is lower at high pressures and temperatures. Consequently, the mantle was likely enriched in platinum immediately following core-mantle differentiation. Core formation models that incorporate these results and simultaneously account for collateral geochemical constraints, lead to excess platinum in the mantle. A subsequent process such as iron exsolution or sulfide segregation is therefore required to remove excess platinum and to explain the mantle’s modern HSE signature. A vestige of this platinum-enriched mantle can potentially account for 186Os-enriched ocean island basalt lavas.

Date: 2021
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DOI: 10.1038/s41467-021-23137-5

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