[S-IT15] 地球深部科学 - 核・マントルの相互作用と共進化

[SIT15-06] Effects of the Core-Mantle Interaction on the Distribution of Sulfur in the Earth's Deep Interior

*土屋 卓久¹、伊藤 慧¹ (1.愛媛大学地球深部ダイナミクス研究センター)

キーワード：第一原理熱力学積分計算、硫黄の鉄ケイ酸塩間分配、外核の密度欠損

Although several experiments have been conducted to measeure high-pressure metal/silicate partitioning of sulfur, results scatter considerably at high pressure and it is still largely unclear. While earlier experiments reported a highly siderophile character of sulfur at high-P,T, more recent experiments showed a less siderophile one, suggesting sulfur could be excluded from the major light element candidates of the outer core. Since this property is a key to understanding the effects of the core-mantle interaction on the distribution of sulfur in the Earth's deep interior, we perform ab initio determination of partitiong behavior of sulfur between liquid metal and silicate melt in the deep mantle pressure condition.