*Takuya Moriguti¹, Akira Yoneda¹, Eiji Ito¹ (1.Institute for Planetary Materials, Okayama University)

*Shimbori Nozomi¹, Tatsuki Tsujimori⁴, Naoto Hirano⁴, Jun-Ichi Kimura², Vladimir Malkovets³ (1.National University University Tohoku University, 2.Japan Agency for Marine-Earth Science and Technology , 3.VS Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, 4.Center for Northeast Asian Studies)

*Ryunosuke Enoeda¹, Mitsuhiro Nakagawa¹ (1.Hokkaido University)

Masahiro Kobayashi¹, *Hirochika Sumino², Keisuke Nagao³, Satoko Ishimaru⁴, Shoji Arai⁵, Masako Yoshikawa⁶, Tatsuhiko Kawamoto⁶, Yoshitaka Kumagai⁶, Tetsuo Kobayashi⁷, Ray Burgess⁸, Chris Ballentine⁹ (1.Geochemical Research Center, Graduate School of Science, University of Tokyo, 2.Department of Basic Science, Graduate School of Arts and Sciences, University of Tokyo, 3.Division of Polar Earth-System Sciences, Korea Polar Research Institute, 4.Department of Earth and Environmental Sciences, Graduate School of Science and Technology, Kumamoto University, 5.Department of Earth Sciences, Faculty of Science, Kanazawa University, 6.Beppu Geothermal Research Laboratory, Institute for Geothermal Sciences Graduate School of Sciences, Kyoto University, 7.Department of Earth and Environmental Sciences, Graduate School of Science and Engineering, Kagoshima University, 8.School of Earth and Environmental Sciences, University of Manchester, 9.Department of Earth Sciences, University of Oxford)

*Takeshi Kuritani^1,2, Tetsuya Sakuyama², Natsumi Kamada², Tetsuya Yokoyama³, Mitsuhiro Nakagawa¹ (1.Graduate School of Science, Hokkaido University, 2.Faculty of Science, Osaka City University, 3.School of Science, Tokyo Institute of Technology)

*Akira Ishikawa^1,2, Katsuhiko Suzuki², Tetsu Kogiso³, Norikatsu Akizawa³ (1.Department of Earth Science and Astronomy, The University of Tokyo, 2.Research and Development Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology, 3.Graduate Scool of Human and Environmental Studies, Kyoto University)

*Katsuyoshi Michibayashi¹, Kakihata Yuki¹, Henry JB Dick² (1.Institute of Geosciences, Shizuoka University, 2.Woods Hole Oceanographic Institution)

*Shigeaki Ono¹ (1.Japan Agency for Marine-Earth Science and Technology)

*Tomoaki Morishita¹, Yumiko Harigane², Yusuke Soda¹, Akihiro Tamura¹, Satoshi Hashimoto¹, Jonathan Snow³ (1.Kanazawa University, 2.Research Institute of Geology and Geoinformation, Geological Survey of Japan, AIST, 3.University of Houston)

*Eiichi TAKAZAWA^1,2, Keisuke ISHII³, Yuki Nomoto³, Yoshihiko Tamura² (1.Department of Geology, Faculty of Science, Niigata University, 2.R&D Center for ODS, JAMSTEC, 3.Graduate School of Science and Technology, Niigata University)