Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusm.v31a..07c&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #V31A-07
Physics
1015 Composition Of The Core, 1025 Composition Of The Mantle, 1038 Mantle Processes (3621), 1060 Planetary Geochemistry (5405, 5410, 5704, 5709, 6005, 6008)
Scientific paper
Sulfur has been proposed to be a component of the light element in Earth's core, and thus interpreting the mantle S abundance can provide constraints on Earth's core formation process and core composition. Based on metal-silicate partitioning experiments, Li and Agee (2001) concluded that Earth's mantle S abundance is too high to be due to equilibrium core formation in a high pressure, high temperature magma ocean on the early Earth; consequently, the addition of S to the mantle from the subsequent accretion of a late veneer would be required to produce the mantle S content. Independently of and contemporaneous to the Li and Agee (2001) study, Holzheid and Grove (2002) conducted similar metal-silicate equilibrium partitioning experiments in a S-bearing system. Though the experiments were similar to those of Li and Agee (2001), Holzheid and Grove (2002) concluded that Earth's mantle S abundance could indeed be set by metal-silicate equilibration in a high pressure, high temperature magma ocean with a metallic liquid that had 5.5-12 wt% S. We have examined the data sets from both the Li and Agee (2001) and Holzheid and Grove (2002) studies in an attempt to reconcile these contradictory conclusions. Through parameterizing existing metal-silicate partitioning data for S and applying the parameterization to core formation in Earth, our work suggests that a large number of pressure and temperature combinations predict partitioning values for S that could explain the observed S mantle abundance. Furthermore, these pressure and temperature solutions are found to be largely independent of the S concentration in Earth's core. Thus, we find that the mantle abundance of S is consistent with pressures of 35-60 GPa and temperatures of 2500-4000 K; this overlaps with the pressure and temperature range proposed by previous studies to similarly match the mantle abundances of Ni and Co by core formation in an early magma ocean on Earth.
Chabot Nancy Lynne
Righter Kevin
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