Mobility of core melts during Earth's accretion

Details Mobility of core melts during Earth's accretion Mobility of core melts during Earth's accretion

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996e%26psl.143..137b&link_type=abstract

Earth and Planetary Science Letters, Volume 143, Issue 1-4, p. 137-145.

Physics

22

Scientific paper

We have equilibrated carbon-saturated Fe-Ni-Co-S melts in a San-Carlos olivine matrix between 1350 and 1570°C at 2 GPa, to measure the median dihedral angles of metallic core melts in a silicate mantle matrix as a function of temperature and sulfur fugacity. The angles increase from about 68° for the most oxidized monosulfide liquid solutions (metal-sulfur ratio ~ 0.97), to ~ 115° for the most reduced metal-rich melts (M/S ~ 100). Temperature effects are small. These angles preclude that metallic core melts could have segregated efficiently from a crystalline silicate mantle by grain boundary percolation. We suggest that core formation must have occurred from a magma ocean.

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