[S-GC56_30PM2] 固体地球化学・惑星化学

[SGC56-09] サブボトムプロファイラで見た南鳥島EEZにおけるレアアース泥の分布と特徴

*中村 謙太郎¹、町田 嗣樹²、藤永 公一郎¹、加藤 泰浩³、鈴木 勝彦⁴、高谷 雄太郎³、安川 和孝¹、大田 隼一郎¹、原口 悟¹、荒木 修平¹、劉 漢捷¹、宇佐美 諒¹、牧 亮太¹、飯島 耕一⁴、西尾 嘉朗⁴、臼井 洋一⁴、野崎 達生⁴、MR13-E02 Leg2 乗船者一同 ⁴、KR14-02 乗船者一同 ⁴ (1.東大・工・システム創成、2.早大・創造理工、3.東大・エネルギー・資源フロンティアセンター、4.海洋研究開発機構)

キーワード：rare-earth elements, REY-rich mud, Minamitorishima, EEZ, sub-bottom profiler

In recent years, particular attention has been paid to the "REY-rich mud" (deep-sea sediment enriched highly in rare-earth and yttrium (REY)), because of its high potential as a REY resource. The REY-rich mud was originally reported from the central Pacific Ocean in 2011 (Kato et al., 2011). In January 2013, during KR-13-02 cruise, the mud was also discovered at southern part of the Minamitorisima within the Japanese exclusive economic zone (EEZ) (Kato et al., 2013; Fujinaga et al., 2013; Suzuki et al., 2013). Then, in the late 2013 and early 2014, we further conducted two more research cruises (MR13-E02 Leg2 and KR14-02 cruises) in the northern and eastern part of the Minamitorishima EEZ. During the cruises, we performed an acoustic survey using sub-bottom profiler (SBP), together with mud sampling by piston coring. In this presentation, we report the distribution and characteristics of the REY-rich mud in the northern and eastern part of Minamitorishima EEZ inferred by the SBP survey.