Prediction of metal–silicate partition coefficients for siderophile elements: An update and assessment of PT conditions for metal–silicate equilibrium during accretion of the Earth

摘要: Abstract Experimental studies of the partitioning siderophile elements between metallic and silicate liquids have provided fundamental constraints on early history differentiation conditions Earth. With many new even in last 20 yr, several models emerged from results, including low pressure equilibrium, high combined multi-stage models. The reasons – melt composition, effects structure, different methods for calculating metal activity coefficients, role deep mantle phases multitude resulting not been specifically addressed before, yet are critical evaluating more likely realistic four leading to divergence results will be discussed evaluated. behavior moderately Ni Co compared using approaches, each which same conclusion Co. This consistency eliminate supposition that one or other approaches gives a accurate answer element partitioning. Newly updated expressions 11 then derived presented applied Earth evaluate idea late stage equilibration core forming (or magma ocean). It is possible explain all at 27–33 GPa, 3300–3600 K, ΔIW = − 1, peridotite liquid containing 10% light element. main difference current result recent modeling efforts Mn, V, Cr hosted as well core. Ni, Co, Mo, W, P, Cu, Ga, Pd core, detailed here shows importance accounting oxygen fugacity, compositions, temperature pressure. metal–silicate equilibrium restricted range leaving chemical finger print upper remains viable.