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Journal Articles Science Advances Year : 2018

Low hydrogen contents in the cores of terrestrial planets

Abstract

Hydrogen has been thought to be an important light element in Earth's core due to possible siderophile behavior during core-mantle segregation. We reproduced planetary differentiation conditions using hydrogen contents of 450 to 1500 parts per million (ppm) in the silicate phase, pressures of 5 to 20 GPa, oxygen fugacity varying within IW-3.7 and IW-0.2 (0.2 to 3.7 log units lower than iron-wüstite buffer), and Fe alloys typical of planetary cores. We report hydrogen metal-silicate partition coefficients of ~2 × 10$^{−1}$ , up to two orders of magnitude lower than reported previously , and indicative of lithophile behavior. Our results imply H contents of ~60 ppm in the Earth and Martian cores. A simple water budget suggests that 90% of the water initially present in planetary building blocks was lost during planetary accretion. The retained water segregated preferentially into planetary mantles.
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cea-01736955 , version 1 (19-03-2018)

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Attribution - NonCommercial

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Vincent Clesi, Mohamed Ali M.A. Bouhifd, Nathalie Bolfan-Casanova, Geeth Manthilake, Federica Schiavi, et al.. Low hydrogen contents in the cores of terrestrial planets. Science Advances , 2018, 4 (3), pp.e1701876. ⟨10.1126/sciadv.1701876⟩. ⟨cea-01736955⟩
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