*Takumi Sakurai¹, Shoichi Itoh¹, Takaaki Noguchi¹, Sota Niki², Takafumi Hirata² (1.Kyoto University, 2.Geochemical Research Center, School of Science, The University of Tokyo)

*Masayuki Ikeda¹, Nodoka Kuramoto¹, Aki Sakuma¹, Mizuki Tojima¹, Sota Niki¹, Hiroki Kamikura¹, Rio Miyata¹, Kentaro Izumi² (1.University of Tokyo, 2.Chiba University)

*Tetsuo Kawakami¹, Shumpei Kudo¹, Sota Niki², Katsushi Sato¹, Harutaka Sakai¹, Takafumi Hirata² (1.Graduate School of Science, Kyoto University, 2.Geochemical Research Center, The University of Tokyo)

*Cheolwoo Kim¹, Tetsuo Kawakami¹, Fumiko Higashino¹, Shumpei Kudo¹, Miku Nakano¹, Sota Niki², Takafumi Hirata² (1.Graduate School of Science, Kyoto University, 2.Geochemical Research Center, Graduate School of Science, The University of Tokyo)

*Ito Kengo¹, Sota Niki¹, Tsuyoshi Iizuka², Takafumi Hirata¹ (1.The University of Tokyo, School of science, Geochemical research center, 2.The University of Tokyo, School of science, Department of earth and planetary science)

*Norikatsu Akizawa¹, Ito Kengo², Sota Niki², Takafumi Hirata², Kyoko Okino¹, Yasuhiko Ohara^3,4,5 (1.Atmosphere and Ocean Research Institute, The University of Tokyo, 2.Geochemical Research Center, The University of Tokyo, 3.Hydrographic and Oceanographic Department of Japan, 4.JAMSTEC, 5.Nagoya University)

*Shumpei Kudo¹, Sota Niki², Takafumi Hirata², Tetsuo Kawakami¹ (1.Department of Geology and Mineralogy, Graduate School of Science, Kyoto University, 2.Geochemical Research Center, School of Science, The University of Tokyo)

*Nakajima Toru¹, Sota Niki², Shumpei Kudo³, Tetsuo Kawakami³, Fumiko Higashino³, Takafumi Hirata², Harutaka Sakai³ (1.Tono Geoscience Center, Japan Atomic Energy Agency, 2.Geochemical Research Centre, The University of Tokyo, 3.Department of Geology and Mineralogy, Graduate School of Science, Kyoto University)

*Sota Niki¹, Keita Takahashi², Takafumi Hirata¹ (1.Geochemical Research Center, School of Science, The University of Tokyo, 2.Department of Earth and Planetary Environmental Science, School of Science, The University of Tokyo)

*Hikaru Sawada^1,2, Ryosuke Oyanagi^3,2, Sota Niki⁴, Kazuki Yoshida⁵, Mitsuhiro Nagata⁶, Takafumi Hirata⁴, Atsushi Okamoto⁵ (1.University of Toyama, 2.JAMSTEC, 3.Kokushikan University, 4.The University of Tokyo, 5.Tohoku University, 6.JAEA)

*Hideki Iwano^1,2, Sota Niki¹, Hisashi Asanuma³, Shuhei Sakata⁴, Yuji Orihashi⁵, Takafumi Hirata¹ (1.Geochemical Research Center, The University of Tokyo, 2.Kyoto Fission-Track Co., Ltd., 3.Graduate School of Human and Environmental Studies, Kyoto University , 4.Earthquake Research Institude, The University of Tokyo , 5.Graduate School of Earth and Environmental Sciences, Hirosaki University )

*Ito Kengo¹, Kanoko Kurihara¹, Masaki Nakazato¹, Sota Niki¹, Takafumi Hirata¹ (1.The University of Tokyo, School of science, Geochemical research center)

*Hideki Iwano^1,2, Sota Niki¹, Takafumi Hirata¹, Tohru Danhara² (1.Geochemical Research Center, The University of Tokyo, 2.Kyoto Fission-Track Co., Ltrd.)

Shuhei Kosugi¹, *Sota Niki¹, Takafumi Hirata¹ (1.Geochemical Research Center, School of Science, The University of Tokyo)

*Ryosuke Nagao¹, Sota Niki³, Yuta Ijichi³, Satoshi Yoshida⁷, Yuki ISHIHARA¹, Yusuke Sawaki², Takeshi Ohno⁵, Yuichiro Ueno⁴, NATSUKO ADACHI⁶, Takafumi Hirata³, Tsuyoshi Komiya^1,2 (1.The University of Tokyo School of Science Department of Earth and Planetary Science , 2.Graduate School of Arts and Sciences, The University of Tokyo, 3.Geochemical Research Center, The University of Tokyo, 4.Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 5.Department of Chemistry, Faculty of Science, Gakushuin University, 6.Department of Geosciences, Osaka Metropolitan University, 7.Center for Northeast Asian Studies, Tohoku University)