[B-PT05] 地球史解読：冥王代から現代まで

[BPT05-03] 南鳥島南方海域における超高濃度レアアース泥の分布状況

*藤永 公一郎^1,2、安川 和孝^2,1、町田 嗣樹^3,2、野崎 達生^3,2、高谷 雄太郎^4,2、大田 隼一郎²、大矢 和孝²、新熊 大生⁴、西尾 嘉朗⁵、正木 裕香³、臼井 洋一³、原口 悟³、飯島 耕一³、天川 裕史³、鈴木 勝彦³、中村 謙太郎^2,3、加藤 泰浩^2,3,1、MR15-E02 Leg.2 乗船者一同 (1.千葉工業大学、2.東京大学大学院工学系研究科システム創成学専攻、3.国立研究開発法人海洋研究開発機構、4.早稲田大学創造理工学部環境資源工学科、5.高知大学農林海洋科学部)

キーワード：レアアース、レアアース泥、南鳥島、深海底鉱物資源

Since the discovery of the “extremely REY-rich mud” (ΣREY > 5000 ppm) in the Japanese exclusive economic zone (EEZ) surrounding Minamitorishima Island (Kato et al., 2013), we conducted seven research cruises over three years. In the MR15-E01 Leg 2 cruise, one of the latest research cruises by R/V Mirai from March 14 to 28, 2015, we focused to investigate the detailed distribution of the extremely REY-rich mud in the southern part from the Minamitorishima EEZ. During the cruise, we collected 13 sediment cores by piston coring. Here, we report the distribution, visual core descriptions, bulk-sediment chemical compositions of the deep-sea sediment in the southern part of the Minamitorishima EEZ in order to clarify geological and geochemical characteristics of the extremely REY-rich mud.