*Fumito Shiraishi¹, Yuya Matsumura¹, Ryoji Chihara¹, Tomoyo Okumura², TAKAAKI ITAI³, Teruhiko Kashiwabara⁴, Akihiro Kano³, Yoshio Takahashi³ (1.Hiroshima University, 2.Kochi University, 3.The University of Tokyo, 4.JAMSTEC)

*Shogo Aoki¹, Takeshi Ohno³, Ryoichi Nakada⁴, Teruhiko Kashiwabara⁵, Yoshio Takahashi⁶, Harilaos Tsikos⁷, Tsuyoshi Komiya² (1.Faculty of Biosphere-Geosphere Science, Okayama University of Science, 2.Graduate School of Arts and Sciences, the University of Tokyo, 3.Faculty of Science, Gakushuin University, 4.Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 5.Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 6.Graduate School of Science, The University of Tokyo, 7.Geology Department, Rhodes University)

*Masato Tanaka¹, Daisuke Ariga², Teruhiko Kashiwabara³, Yoshio Takahashi¹ (1.Graduate School of Science, The University of Tokyo, 2.Graduate School of Science, Hiroshima University, 3.Japan Agency for Marine-Earth Science and Technology (JAMSTEC))