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Element partitioning between metallic liquid, magnesiowustite, and silicate liquid at 20 GPa and 2500°C: A secondary ion mass spectrometric study
Author(s) -
Ohtani Eiji,
Yurimoto Hisayoshi
Publication year - 1996
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/96gl01469
Subject(s) - silicate , metal , partition coefficient , mantle (geology) , thermodynamics , materials science , ion , liquid metal , metal ions in aqueous solution , analytical chemistry (journal) , mineralogy , chemistry , physics , metallurgy , organic chemistry , geophysics
We determined the partition coefficients of 20 elements between metallic liquid, magnesiowustite, and silicate liquid at 20 GPa and 2500°C. The partition coefficients of V, Cr, Mn, Co, Ni, and Cu between metallic liquid and magnesiowustite are similar to those between metallic liquid and silicate liquid. The partitioning behavior of Si, P, W and Pb between metallic liquid and magnesiowustite show remarkable differences to that between metallic liquid and silicate liquid, reflecting incompatibility of these elements in magnesiowustite. Comparison of the present data with the previous ones implies that the metallic liquid‐siicate liquid partition coefficients of Co, Ni, W, and Mo decrease whereas those of Cr, and Mn increase due to the combined effect of pressure and temperature, although some other factors such as the liquid composition might play some roles on a large difference in D for Mo and W. The core and mantle concentrations for Co and Ni estimated by Allegre et al. [1995] are consistent with the metal‐silicate equilibrium at lower mantle conditions, although other models such as inhomogeneous accretion are also able to explain the core‐mantle concentrations.