*Mayuko SHIMIZU¹, Wataru TANIKAWA², Yohei HAMADA², Jun KAMEDA³, Asuka YAMAGUCHI⁴, Gaku KIMURA⁵ (1.Japan Atomic Energy Agency, 2.Japan Agency for Marine-Earth Science and Technology Kochi Institute for Core Sample Research, 3.Earth and Planetary System Science Department of Natural History Sciences, Graduate School of Scienc, 4.Atomosphere and Ocean Research Institute, The University of Tokyo, 5.Department of Earth and Planetary Science of the Graduate School of Science, The University of Tokyo)

*Jun KAMEDA¹, Robert HARRIS², Mayuko SHIMIZU³, Kohtaro UJIIE⁴, Akito TSUTSUMI⁵, Minoru IKEHARA⁶, Masaoki UNO⁷, Asuka YAMAGUCHI⁸, Yohei HAMADA⁹, Yuka NAMIKI⁵, Gaku KIMURA¹⁰ (1.Hokkaido University, 2.Oregon State University, 3.Japan Atomic Energy Agency, 4.University of Tsukuba, 5.Kyoto University, 6.Kochi University, 7.Tohoku University, 8.Univeristy of Tokyo, 9.Japan Agency for Marine-Earth Science and Technology, 10.University of Tokyo)

*Wataru TANIKAWA¹, Asuka YAMAGUCHI², Yohei HAMADA¹, Jun KAMEDA³, Osamu TADAI⁴, Kentaro HATAKEDA⁴ (1.JAMSTEC/KCC, 2.Tokyo University, 3.Hokkaido Univeristy, 4.Marine Works Japan. LTD)

*Wataru TANIKAWA¹, Asuka YAMAGUCHI², Yohei HAMADA¹, Jun KAMEDA³, Osamu TADAI⁴, Kentaro HATAKEDA⁴ (1.JAMSTEC/KCC, 2.Tokyo University, 3.Hokkaido Univeristy, 4.Marine Works Japan. LTD)

*Asuka YAMAGUCHI¹, Wataru TANIKAWA², Osamu TADAI³, Jun KAMEDA⁴ (1.Atmosphere and Ocean Research Institute, the University of Tokyo, 2.Japan Agency for Marine-Earth Science and Technology, Kochi Instutute for Core Sample Research, 3.Marine Works Japan, 4.Earth and Planetary System Science Department of Natural History Sciences, Graduate School of Scienc)