*Kazuhito Ozawa¹, Yuto Sato², Nasrrddine Youbi³, Moulay Ahmed Boumehdi³ (1.Atmosphere and Ocean Research Institute, The University of Tokyo, 2.Guangzhou Institute of geochemistry, CAS, 3.Geology Department, Cadi Ayyad University)

*Akane Matsuzaki¹, Yui Kouketsu¹, Katsuyoshi Michibayashi¹ (1.Graduate School of Environmetal Studies, Nagoya University)

*Yoshihiro Nakamura¹, Kazuhiro Miyazaki¹, Makoto Takeuchi^2,1, Hideki Iwano³, Tohru Danhara³, Takafumi Hirata⁴ (1.Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, 2.Graduate School of Environmental Studies, Nagoya University, 3.Kyoto Fission-Track CO., Ltd., 4.Geochemical Research Center, The University of Tokyo)

*Takuro Yoshioka¹, Kyuichi Kanagawa², Yoshikuni Hiroi³, Simon Richard Wallis⁴, Takayoshi Nagaya⁴, Takao Hirajima⁶, Martin Svojtka⁵, Tomokazu Hokada⁷, Yoichi Motoyoshi⁷ (1.Waseda University School of Creative Science and Engineering, 2.Research School of Science, Chiba University, 3.Faculty of Liberal Arts, The Open University of Japan, 4.Graduate of School of Science, University of Tokyo, 5.Institute of Geology, Academy of Sciences of the Czech Republic, 6.Graduate of School of Science, Kyoto University, 7.Geoscience Group, National Institute of Polar Research)

*Shumpei Kudo¹, Tetsuo Kawakami¹, Toru Nakajima², Harutaka Sakai¹ (1.Graduate School of Science, Kyoto University, 2.Tono Geoscience Center, Japan Atomic Energy Agency)