Partitioning of Ni between magnesiowuestite and metal at high pressure - Implications for core-mantle equilibrium

Details Partitioning of Ni between magnesiowuestite and metal at high pressure - Implications for core-mantle equilibrium Partitioning of Ni between magnesiowuestite and metal at high pressure - Implications for core-mantle equilibrium

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.105..293u&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 105, no. 1-3, July 1991, p. 293-313. Research supported by DELP of Ja

Computer Science

6

Earth Core, Earth Mantle, Geochemistry, Metal Compounds, Nickel, Phase Separation (Materials), Magnesium Compounds, Metamorphism (Geology), Thermodynamic Equilibrium

Scientific paper

This paper experimentally investigates the partitioning of Ni between metal and magnesiowuestite up to 17 GPa. From a thermodynamic analysis of the experimentally determined distribution coefficient, seven thermodynamic parameters are obtained relevant to its dependency on pressure, temperature, and chemical composition. KD(M/MW is found to be strongly dependent on pressure, temperature, and MgO content in magnesiowuestite. The pressure effect is strongest and KD(M/MW) significantly decreases with increasing pressure. KD between metal and bulk mantle silicates, KD(M/BMS), is estimated on the basis of compiled data of KD(M/Silicates) and the extrapolated value of KD(M/MW). KD(M/BMS) also decreases with pressure. The equilibrium partitioning of Ni during core-mantle separation combined with a subsequent mantle differentiation is argued as the reason for the high NI concentration in the earth's uppermost mantle.

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