Investigating earth’s formation history through copper and sulfur metal-silicate partitioning during core-mantle differentiation

Mahan, B., Siebert, J., Blanchard, I., Badro, J., Kubik, E., Sossi, P., and Moynier, F. (2018) Investigating earth’s formation history through copper and sulfur metal-silicate partitioning during core-mantle differentiation. Journal of Geophysical Research: Solid Earth, 123 (10). pp. 8349-8363.

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Abstract

Identifying extant materials that act as compositional proxies for Earth is key to understanding its accretion. Copper and sulfur are both moderately volatile elements; however, they display different geochemical behavior (e.g., phase affinities). Thus, individually and together, these elements provide constraints on the source material and conditions of Earth’s accretion, as well as on the timing and evolution of volatile delivery to Earth. Here we present laser-heated diamond anvil cell experiments at pressures up to 81 GPa and temperatures up to 4,100 K aimed at characterizing Cu metal-silicate partitioning at conditions relevant to core-mantle differentiation in Earth. Partitioning results have been combined with literature results for S in Earth formation modeling to constrain accretion scenarios that can arrive at present-day mantle Cu and S contents. These modeling results indicate that the distribution of Cu and S in Earth may be the result of accretion largely from material(s) with Cu contents at or above chondritic values and S contents that are strongly depleted, such as that in bulk CH chondrites, and that the majority of Earth’s mass (~3/4) accreted incrementally via pebble and/or planetesimal accretion.

Item ID: 62757
Item Type: Article (Research - C1)
ISSN: 2169-9356
Copyright Information: © 2018. American Geophysical Union. All Rights Reserved.
Funders: Sorbonne Paris Cité (SPC), Paris-IdF region SESAME (PIS), IDEX SPC, French National Research Agency (ANR), European Research Council (ERC), L'Agence Nationale de la Recherche (ANR)
Projects and Grants: SPC UnivEarthS Labex program (ANR-10-LABX-0023and ANR-11-IDEX-0005-02), PIS grant 12015908, IDEX SPC PhD fellowship, ANR Project VolTerre, grant ANR-14-CE33-0017-01, ERC European Community’s Seventh Framework Programme (FP7/2007-2013)/ERC grant agreement 207467 (DECore), ERC H2020 framework program/ERC grant agreement 637503 (Pristine), ANR chaire d’excellence Sorbonne Paris Cité
Date Deposited: 28 Jun 2020 19:17
FoR Codes: 04 EARTH SCIENCES > 0402 Geochemistry > 040202 Inorganic Geochemistry @ 50%
04 EARTH SCIENCES > 0402 Geochemistry > 040299 Geochemistry not elsewhere classified @ 50%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970104 Expanding Knowledge in the Earth Sciences @ 100%
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