Partitioning behavior of moderately siderophile elements at elevated temperatures and pressures

Details Partitioning behavior of moderately siderophile elements at elevated temperatures and pressures Partitioning behavior of moderately siderophile elements at elevated temperatures and pressures

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29q.473h&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 473

Mathematics

Abundance, Earth Core, Earth Mantle, Pressure Effects, Siderites, Temperature Effects, Chemical Composition, Liquid-Solid Interfaces, Magma, Mathematical Models, Silicates, Solid-Solid Interfaces

Scientific paper

It has long been known that the abundances of siderophile elements in the Earth's mantle are too high for it to have been in equilibrium with Fe in the core if equilibrium between metal and silicate occurred at low pressures and temperatures near the surface of the Earth. Many models have been proposed to account for this discrepancy, including heterogeneous accretion, inefficient core formation, homogeneous accretion with continuous core formation, and simple equilibrium at magma ocean temperatures. Whatever the mechanism for core formation, high pressure and temperatures in the deep interior of the Earth likely played a role in the partitioning of siderophile elements between metallic and silicate phases. The metal-silicate partitioning behavior of moderately siderophile elements at high pressures and temperatures was studied using the 1200-ton multianvil apparatus at the Bayerisches Geoinstitut. The samples are contained within Al2O3 or MgO capsules within an 18 mm octahedral assembly. The two different sample container materials impose different redox states on our samples. Samples run in Al2O3 containers are 1.6 log units below the iron-wustite buffer. We have previously reported metal-silicate partition coefficients for Ni, Co, V, Cr, Mn, and Fe and lower limits for Mo and W at 100 kbars and 200 C. Results suggest that simple equilibrium between metal and silicate most likely could not account for the near-chondritic relative abundances of Ni, Co, and W in the Earth's mantle, and also that V, Cr, and Mn would not be depleted in the Earth's mantle by metal segregation at these temperatures and pressures. Current experiments expand our suite of elements to include P, Ge, and Ga. They also separate effects of temperature and pressure on the metal-silicate partition coefficients.

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