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The Effects of Carbon Concentration and Silicate Composition on the Metal‐Silicate Partitioning of Carbon in a Shallow Magma Ocean
Author(s) -
Kuwahara H.,
Itoh S.,
Nakada R.,
Irifune T.
Publication year - 2019
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 - 10.1029/2019gl084254
Subject(s) - silicate , carbon fibers , mantle (geology) , partition coefficient , metal , carbon cycle , carbon sequestration , geology , mineralogy , carbon dioxide , materials science , chemistry , geochemistry , organic chemistry , ecology , ecosystem , composite number , composite material , biology
The partitioning of carbon between the core and mantle during the formation of terrestrial planets may have controlled the distribution of carbon in terrestrial planets. However, the abundance of carbon in the Earth's mantle is higher than a prediction based on previous metal‐silicate partitioning experiments of carbon at carbon‐saturated conditions by more than an order of magnitude. Here, we report new metal‐silicate partitioning experiments of carbon at carbon contents of 0.25–0.5 wt%. We show that the metal‐silicate partition coefficient of carbon ( D C met / sil ) strongly correlates with nonbridging oxygen per tetrahedral cations ( nbo/t ) of silicate melts at f O 2conditions where C‐H species are stable. Moreover, the results suggest that D C met / silat carbon‐undersaturated conditions may be lower than that at carbon‐saturated condition. Thus, D C met / silat low carbon concentrations is essentially important to investigate the distribution of carbon in the Earth during the core formation.