Core formation and core composition from coupled geochemical and geophysical constraints

Badro, James; Brodholt, John P.; Piet, Helene; Siebert, Julien; Ryerson, Frederick J.

doi:10.1073/pnas.1505672112

Title: Core formation and core composition from coupled geochemical and geophysical constraints

Journal Article · Mon Sep 21 00:00:00 EDT 2015 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.1505672112· OSTI ID:1343007

Badro, James ^[1]; Brodholt, John P. ^[2]; Piet, Helene ^[1]; Siebert, Julien ^[3]; Ryerson, Frederick J. ^[4]

Institut de Physique du Globe de Paris, Paris (France); Ecole Polytechnique Federale Lausanne, Lausanne (Switzlerland)
Univ. College London, London (United Kingdom)
Institut de Physique du Globe de Paris, Paris (France)
Institut de Physique du Globe de Paris, Paris (France); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

The formation of Earth’s core left behind geophysical and geochemical signatures in both the core and mantle that remain to this day. Seismology requires that the core be lighter than pure iron and therefore must contain light elements, and the geochemistry of mantle-derived rocks reveals extensive siderophile element depletion and fractionation. Both features are inherited from metal–silicate differentiation in primitive Earth and depend upon the nature of physiochemical conditions that prevailed during core formation. To date, core formation models have only attempted to address the evolution of core and mantle compositional signatures separately, rather than seeking a joint solution. Here we combine experimental petrology, geochemistry, mineral physics and seismology to constrain a range of core formation conditions that satisfy both constraints. We find that core formation occurred in a hot (liquidus) yet moderately deep magma ocean not exceeding 1,800 km depth, under redox conditions more oxidized than present-day Earth. This new scenario, at odds with the current belief that core formation occurred under reducing conditions, proposes that Earth’s magma ocean started oxidized and has become reduced through time, by oxygen incorporation into the core. As a result, this core formation model produces a core that contains 2.7–5% oxygen along with 2–3.6% silicon, with densities and velocities in accord with radial seismic models, and leaves behind a silicate mantle that matches the observed mantle abundances of nickel, cobalt, chromium, and vanadium.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1343007

Report Number(s):: LLNL-JRNL-679548

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Vol. 112, Issue 40; ISSN 0027-8424

Publisher:: National Academy of Sciences, Washington, DC (United States)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 114 works

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