*Katsuhiko Suzuki¹, Asako Takamasa^2,1, Yusuke Fukami^3,1, Tsuyoshi Iizuka⁴, Yuji Orihashi⁵, Ryuichi Shinjo⁶, Takeshi Hanyu⁷ (1.Submarine Resources Research Center, JAMSTEC, 2.JAPAN NUS CO., Ltd, 3.Department of Chemistry, Gakushuin University, 4.Department of Earth and Planetary Science, The University of Tokyo, 5.Department of Earth and Environmental Sciences, Hirosaki University, 6.Department of Physics and Earth Sciences, University of the Ryukyus , 7.Volcanoes and Earth’s Interior Research Center, JAMSTEC)

*Reishi Takashima¹, Haruka Kusakawa², Yuji Orihashi³, Hiroshi Nishi¹ (1.Tohoku University, 2.Chichibu Taiheiyo Cement Co. Ltd. , 3.Hirosaki University)

*Hideki Iwano¹, Takafumi Hirata², Yuji Orihashi³, Tohru Danhara¹, Harutaka Sakai⁴ (1.Kyoto Fission-Track Co., Ltd., 2.Geochemical Research Center, University of Tokyo, 3.Hirosaki University, 4.Kyoto University)

*Hiroshi Nishi¹, Reishi Takashima¹, Keiichi Hayashi², Kuwabara Sato², Yuji Orihashi³, Toshiro Yamanaka⁴ (1.The Center for Academic Resources and Archives, The Tohoku Museum Tohoku University, 2.Geological Survey of Hokkaido, 3.Hirosaki University, 4.Tokyo University of Marine Science and Technology)