Pressure Effect on Partitioning of Ni, Co, S: Implications for Mantle-Core Formation

Details Pressure Effect on Partitioning of Ni, Co, S: Implications for Mantle-Core Formation Pressure Effect on Partitioning of Ni, Co, S: Implications for Mantle-Core Formation

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..749l&link_type=abstract

Lunar and Planetary Science, volume 27, page 749

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Magma Ocean, Mantle: Core Formation, Partitioning, Pressure: High, Siderophile Elements

Scientific paper

Isothermal experiments up to 20 GPa show a dramatic influence of pressure on partitioning of Ni and S between molten Fe-alloy and silicate melt. Both Ni and Co become less siderophile with pressure. Pressure affects Ni much more than Co such that their decreasing partition coefficients (D alloy melt/silicate melt) reach values of 29 and 26 respectively at an extrapolated pressure of ~28 GPa. The observed abundances of Ni and Co and their near chondritic ratio can be explained by alloy-silicate chemical equilibrium at high pressure during core extraction in a magma ocean. The partitioning behavior of sulfur is the opposite of Ni and Co--it becomes more siderophile with pressure. Sulfur's enhanced affinity for Fe-alloy with depth indicates that it is likely the dominant light element in the Earth's core.

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