*li WENSHUAI¹, Yoshio Takahashi¹, Akira Usui², Ryoichi Nakada³, Teruhiko Kashiwabara⁴, Hajime Obata⁵, Naoya Kanna⁵, Yoshihiro Asahara⁶, Hirofumi Tazoe⁷, Masato Tanaka¹ (1.Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo, Japan. , 2.Center for Advanced Marine Core Research, Kochi University, Kochi, Japan. , 3.Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Kochi, Japan. , 4.Submarine Resources Research Center (SRRC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan. , 5.Atmosphere and Ocean Research Institute, The University of Tokyo, Japan. , 6.Department of Earth and Environmental Sciences, Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan. , 7. Institute of Radiation Emergency Medicine, Hirosaki University, Honcho, Hirosaki, Aomori, Japan)

*Makoto Miyajima¹, Shingo Kato^2,3, Katsuhiko Suzuki³, Akira Usui⁴, Tomoyo Okumura⁴ (1.Kochi University, 2.RIKEN, 3.JAMSTEC, 4.MaCRI, Kochi University)

*Kyoko Yamaoka¹, Travis Washburn¹, Akira Iguchi¹, Atsushi Suzuki¹, Tetsuhiro Ishitani², Chisato Murakami³, Akira Tsune³ (1.Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, 2.Marine Biological Research Institute of Japan Co.,Ltd., 3.Deep Ocean Resources Development Co.,Ltd.)

*Minako Tanaka¹, Tatsuo Fukuhara¹, Kyoko Yamaoka², Takeshi Fujii¹, Koh Harada¹, Chisato Murakami³, Akira Tsune³ (1.KANSO TECHNOS Co., Ltd., 2.Geological Survey of Japan, AIST, 3.Deep Ocean Resources Development Co., Ltd.)

*Tatsuo Fukuhara¹, Minako Tanaka¹, Yuya Yamamoto¹, Chisato Murakami², Akira Tsune² (1.KANSO TECHNOS Co., Ltd., 2.Deep Ocean Resources Development Co., Ltd.)

*Tomo Kitahashi¹, Miyuki Nishijima², Akira Iguchi², Shunsuke Kondo¹, Atsushi Suzuki² (1. KANSO TECHNOS Co., Ltd., 2.National Institute of Advanced Industrial Science and Technology)