[S-GC56_30PM2] 固体地球化学・惑星化学

[SGC56-10] 南鳥島EEZ北部に分布するレアアース泥の地球化学的特徴

*藤永 公一郎¹、加藤 泰浩¹、中村 謙太郎²、鈴木 勝彦³、町田 嗣樹⁴、高谷 雄太郎¹、安川 和孝²、大田 隼一郎²、原口 悟¹、荒木 修平²、劉 漢捷²、宇佐美 諒²、牧 亮太²、飯島 耕一³、西尾 嘉朗³、臼井 洋一³、野崎 達生³、MR13-E02 Leg2 乗船者一同 ³、KR14-02 乗船者一同 ³ (1.東京大学大学院工学系研究科エネルギー・資源フロンティアセンター、2.東京大学大学院工学系研究科システム創成学専攻、3.海洋研究開発機構、4.早稲田大学創造理工学部環境資源工学科)

キーワード：rare earth elements (REEs), REY-rich mud, Minamitorishima, deep-sea mineral resource

Recently, deep-sea sediment enriched in rare-earth elements and yttrium (REY) (called REY-rich mud) has been reported from a central part of the Pacific Ocean (Kato et al., 2011). Due to its great potential as a completely new REY resource, the REY-rich mud attracts particular attention from a wide field of scientists and non-scientists. In 2013, we have discovered the deep-sea sediments that are extremely enriched in REY (~6,600 ppm) from the south region of the Minamitorishima within the Japanese exclusive economic zone (EEZ) (Kato et al., 2013; Fujinaga et al., 2013; Suzuki et al., 2013). In 2014, in order to investigate the detailed distribution of REY-rich mud in the EEZ of Minamitorishima, we further conducted research cruises (MR13-E02 Leg. 2 and KR14-02) in the north region of the Minamitorishima. Here, we report the distribution, mineral composition, and geochemical features of the REY-rich mud from the north region of the Minamitorishima EEZ.