The Effects of Carbon Concentration and Silicate Composition on the Metal‐Silicate Partitioning of Carbon in a Shallow Magma Ocean
The Effects of Carbon Concentration and Silicate Composition on the Metal‐Silicate Partitioning of Carbon in a Shallow Magma Ocean
复制标题
浅层岩浆海中碳浓度和硅酸盐成分对碳金属硅酸盐分配的影响
DOI：
10.1029/2019gl084254
复制
发表时间：
2019
影响因子：
5.2
通讯作者：
Irifune T.
中科院分区：
文献类型：
--
作者：
Kuwahara H.;Itoh S.;Nakada R.;Irifune T.
类地行星形成过程中碳在地核和地幔之间的分配可能控制了类地行星中碳的分布。然而，地球地幔中碳的丰度比基于碳饱和条件下碳的金属硅酸盐分配实验的预测高出一个数量级以上。在这里，我们报告了碳含量为0.25-0.5重量%的碳的新金属硅酸盐分配实验。我们发现，金属-硅酸盐的碳分配系数（）与硅酸盐熔体中每个四面体阳离子的非桥氧（NbO/T）密切相关， C-H物种稳定的条件。此外，结果表明， 在碳不饱和条件下的可能低于在碳饱和条件下的。因此，在本发明中， 在低碳浓度下，对于研究地核形成过程中碳在地球中的分布至关重要。
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 ( ) strongly correlates with nonbridging oxygen per tetrahedral cations (nbo/t) of silicate melts at conditions where C‐H species are stable. Moreover, the results suggest that at carbon‐undersaturated conditions may be lower than that at carbon‐saturated condition. Thus, at low carbon concentrations is essentially important to investigate the distribution of carbon in the Earth during the core formation.