*Hiroyuki Hoshi¹, Yuu Kawakami^2,3, Hideki Iwano^4,5, Tohru Danhara⁴ (1. Aichi University of Education, 2. Graduate School of Education, Aichi University of Education, 3. Japan Oil, Gas and Metals National Corporation (JOGMEC), 4. Kyoto Fission-Track Co., Ltd, 5. Geochemical Research Center, The University of Tokyo)

*Hidetoshi HARA¹ (1. Institute of Geology and Geoinformation, Geological Survey of Japan, AIST)

*Hinako Matsumoto¹, Satoshi Tonai¹ (1. Kochi University)

*Satoshi Tonai¹, Yuya Nishino¹, Yuhi Matsushima¹, Yoshitaka Hashimoto¹, Koshi Yagi², Naotaka Tomioka³ (1. Kochi Univ., 2. Hiruzen Institute for Geology & Chronology, 3. Kochi Inestitute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology)

*Takashi Nakajima^1,2 (1. National Museumof Nature Science, 2. Kanagawa Prefectural Museum of Natural History)

*Atsushi Yamaji¹, Nao Kusuhashi², Kenichiro Tani³ (1. Kyoto University, 2. Ehime University, 3. National Museumof Nature and Science)

*Daisuke SATO¹ (1. GSJ, AIST)

*Kentaro Ushimaru¹, Atsushi Yamaji¹ (1. Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University)

*Hironao Shinjoe¹, Mana Akasaka², Yuji Orihashi², Sota Niki³, Minoru Sasaki², Takafumi Hirata³ (1. Center for General Education, Tokyo Keizai University, 2. Department of Global Environment and Disaster Prevention, Faculty of Science and Technology, Hirosaki University, 3. Geochemical Research Center, Graduate School of Science, The University of Tokyo)

*Futoshi Nanayama Nanayama¹ (1. Museum of Natural and Environmental History, Shizuoka)

*Makoto Otsubo¹, Ryuta Arai², Tomohiro Toki³, Masataka Kinoshita⁴, Ayanori Misawa¹, Kiyokazu Oohashi⁵, Yoshimi Kubota⁶, Ayumu Miyakawa¹, Fumihiko Ikegami⁷, Christine Regalla⁸, Chih-Chieh Su⁹ (1. Geological Survey of Japan/AIST, 2. JAMSTEC, 3. University of Ryukyus, 4. ERI, The University of Tokyo, 5. Yamaguchi University, 6. Kahaku, 7. University of Tasmania, 8. Northern Arizona University, 9. National Taiwan University)