Japan Geoscience Union Meeting 2015

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Symbol B (Biogeosciences) » B-PT Paleontology

[B-PT23] Decoding the history of Earth: From Hadean to Modern

Mon. May 25, 2015 4:15 PM - 6:00 PM 104 (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(Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology), Chair:Koichiro Fujinaga(Frontier Research for Energy and Resources, School of Engineering, University of Tokyo), Yutaro Takaya(Research and Development (R&D) Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology)

4:45 PM - 5:00 PM

[BPT23-23] Distribution and geochemical features of extremely REY-rich mud in the Minamitorishima EEZ

*Koichiro FUJINAGA1, Kentaro NAKAMURA1, Shiki MACHIDA2, Yutaro TAKAYA3, Kazutaka YASUKAWA1, Junichiro OHTA1, Shuuhei ARAKI1, Hanjie LIU1, Ryo USAMI1, Yusuke MINAMITANI1, Ryota MAKI1, Ryosuke ADACHI1, Kazutaka OYA1, Ryota WATANABE2, Yoshiro NISHIO3, Yuka MASAKI3, Yoichi USUI3, Satoru HARAGUCHI3, Koichi IIJIMA3, Katsuhiko SUZUKI3, Yasuhiro KATO1, MR14-E02, Cruise members 3 (1.Univ. of Tokyo, 2.Waseda Univ., 3.JAMSTEC)

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

A recent report has documented the wide distribution of “REY-rich mud”, deep-sea sediment containing high concentrations of REY (ΣREY = 400–2000 ppm), in the Pacific Ocean (Kato et al., 2011). In 2013, we have discovered the “highly” (ΣREY = 2000–5000 ppm) to “extremely” (ΣREY > 5000 ppm) REY-rich mud in the Japanese Exclusive Economic Zone (EEZ) around Minamitorishima Island (Kato et al., 2013; Fujinaga et al., 2013; Suzuki et al., 2013). To investigate the detailed distribution of extremely REY-rich mud, we conducted the new research cruise (MR14-E02 by R/V Mirai from October 14 to 29, 2014) in the south region of the Minamitorishima EEZ. We collected 11 sediment cores by piston coring in this cruise. Here we report the distribution, bulk-sediment chemical compositions, and geochemical features of the extremely REY-rich mud in the Minamitorishima EEZ.