Element partitioning between metallic liquid, silicate liquid, and lower-mantle minerals: implications for core formation of the Earth

作者: Eiji Ohtani , Hisayoshi Yurimoto , Shuji Seto

DOI: 10.1016/S0031-9201(96)03234-7

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摘要: We determined the partition coefficients of 19 elements between metallic liquid and silicate at 20 GPa 2500°C, perovskite 27 2200°C. Remarkable differences were observed in partitioning behaviors Si, P, W, Re, Pb among liquid, perovskite, magnesiowustite coexisting with reflecting incompatibility or oxide phase. could not observe any significant difference V, Cr, Mn, Co, Ni, Cu phases liquid. Comparison present data those obtained previously lower pressure temperature suggests that exchange coefficients, Kmet/sil, Mo, W decrease, whereas Mn increase tend to approach unity increasing temperature. also made preliminary experiments clarify effect sulfur on behaviors. Sulfur lowers Mo significantly 2300°C. The mantle abundances Cu, calculated for metal-silicate equilibrium model are than real mantle, K, overabundant mantle. The discrepancies Co Ni be explained by chemical higher Large mantles accounted combined effects equilibrium. volatile loss nebula, perhaps before accretion Earth, Thus may consistent a sulfur-bearing lower-mantle conditions.

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