Physics
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28...81l&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 1, p. 81-84
Physics
13
Geochemistry: Chemical Evolution, Geochemistry: Geochemical Cycles, Mineralogy And Petrology: Experimental Mineralogy And Petrology
Scientific paper
Partitioning of sulfur (S), oxygen (O) and silicon (Si) between liquid Fe-Ni-alloy (LA) and liquid silicate (LS) was studied with a multi-anvil apparatus at pressures between 2 and 25 GPa and temperatures between 2073 and 2623 K. We found that S has a strong affinity for liquid Fe-Ni-alloy at all the experimental conditions investigated. Partition coefficient of S between liquid Fe-Ni-alloy and liquid silicate (DSLA/LS) increases with pressure and decreases with temperature. At the proposed pressure and temperature of core-mantle equilibrium during early Earth differentiation [Li and Agee, 1996; Righter et al., 1997], S is highly siderophile (DSLA/LS~1000), while Si and O are highly lithophile (DSiLA/LS,DOLA/LS<0.03). Our study suggests that if the core composition was largely established by equilibrium partitioning in a deep magma ocean, then S is the most plausible principle light element in the core.
Agee Carl B.
Li Jiying
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