Japan Geoscience Union Meeting 2016

Presentation information

Oral

Symbol B (Biogeosciences) » B-PT Paleontology

[B-PT05] Decoding the history of Earth: From Hadean to Modern

Wed. May 25, 2016 9:00 AM - 10:30 AM 105 (1F)

Convener:*Tsuyoshi Komiya(Department of Earth Science & Astronomy Graduate School of Arts and Sciences The University of Tokyo), Yasuhiro Kato(Department of Systems Innovation, Graduate School of Engineering, University of Tokyo), Katsuhiko Suzuki(Research and Development Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology), Chair:Tsuyoshi Komiya(Department of Earth Science & Astronomy Graduate School of Arts and Sciences The University of Tokyo)

9:30 AM - 9:45 AM

[BPT05-03] Distribution of extremely REY-rich mud in the southern part of the Minamitorishima EEZ

*Koichiro Fujinaga1,2, Kazutaka Yasukawa2,1, Shiki Machida3,2, Tatsuo Nozaki3,2, Yutaro Takaya4,2, Junichiro Ohta2, Kazutaka Oya2, Daiki Niikuma4, Yoshiro Nishio5, Yuka Masaki3, Yoichi Usui3, Satoru Haraguchi3, Koichi Iijima3, Hiroshi Amakawa3, Katsuhiko Suzuki3, Kentaro Nakamura2,3, Yasuhiro Kato2,3,1, MR15-E02 Leg.2 cruise members (1.Chiba Institute of Technology, 2.Department of Systems Innovation, School of Engineering, University of Tokyo, 3.Japan Agency for Marine-Earth Science and Technology, 4.Department of Resources and Environmental Engineering School of Creative Science and Enginerring, Waseda University, 5.Research and Education Faculty, Kochi University)

Keywords:rare earth elements and yttrium (REY), REY-rich mud, Minamitorishima Island, deep-sea mineral resource

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.