JpGU-AGU Joint Meeting 2017

講演情報

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[EE] ポスター発表

セッション記号 S (固体地球科学) » S-IT 地球内部科学・地球惑星テクトニクス

[S-IT22] [EE] 核-マントルの相互作用と共進化

2017年5月21日(日) 13:45 〜 15:15 ポスター会場 (国際展示場 7ホール)

コンビーナ:土屋 卓久(愛媛大学地球深部ダイナミクス研究センター)、寺崎 英紀(大阪大学大学院理学研究科)、Satish-Kumar Madhusoodhan(Department of Geology, Faculty of Science, Niigata University)、入舩 徹男(愛媛大学地球深部ダイナミクス研究センター)、Hernlund John(Earth-Life Science Institute, Tokyo Institute of Technology)、大谷 栄治(東北大学大学院理学研究科地学専攻)

[SIT22-P39] Sound velocity of hcp-Fe at multi-megabar pressures

*坂巻 竜也1、福井 宏之2、大谷 栄治1、田中 遼介1、バロン アルフレッド3 (1.東北大学、2.兵庫県立大学、3.理化学研究所)

キーワード：core, sound velocity, high pressure

Earth’s inner core consists of mainly hexagonal close-packed iron (hcp-Fe). Therefore, the physical properties of hcp-Fe can provide significant knowledge about the core. Despite seismological observations providing density-sound velocity data of Earth’s core, there are few experimental reports about the sound velocity of hcp-Fe at ultrahigh pressure. Direct comparison of the sound velocity of hcp-Fe with that of observed inner core can provide a clear difference between them, which is an important information to determine the core composition. Here, we report the compressional sound velocity (VP) of hcp-Fe up to 250 GPa using an inelastic X-ray scattering technique at BL43LXU of SPring-8. Based on the data, we can provide a standard of hcp-Fe (a linear relation of VP with density: Birch’s law), which enables us to indicate a better constraint on the composition of the Earth's core.