*Natsumi Yoshimoto¹, Tetsuo Kawakami¹ (1.Department of Geology and Mineralogy, Graduate School of Science, Kyoto University)

*Kazuhiro Miyazaki¹, Takeshi Ikeda², Hideki Iwano^3,4, Takafumi Hirata⁴, Tohru Danhara³ (1.Institute of Geology and Geoinformation, Geological Survey of Japan/National Institute of Advanced Industrial Science and Technology, 2.Department of Earth and Planetary Sciences, Kyushu University, 3.Kyoto Fission-Track Co., Ltd, 4.Geochemical Research Center, the University of Tokyo)

*Takeshi Ikeda¹, Kazuhiro Miyazaki², Yu Sugawara¹ (1.Department of Earth and Planetary Sciences,Graduate School of Scinece, Kyushu University, 2.Geological Survey of Japan, AIST)

*Kohei Shiseki¹, Tatsuki Tsujimori¹ (1.Tohoku University)

*Takuro Yoshioka¹, Kyuichi Kanagawa², Yoshikuni Hiroi³, Takao Hirajima⁴, Martin Svojtka⁵, Tomokazu Hokada⁶, Yoichi Motoyoshi⁶, Simon Richard Wallis⁷, Takayoshi Nagaya⁷ (1.Faculty of Science, Chiba University, 2.Research School of Science, Chiba University, 3.Faculty of Liberal Arts, The Open University of Japan, 4.Graduate of School of Science, Kyoto University, 5.Institute of Geology, Academy of Sciences of the Czech Republic, 6.Geoscience Group, National Institute of Polar Research, 7.Graduate of School of Science, University of Tokyo)

*Shumpei Kudo¹, Tetsuo Kawakami¹, Toru Nakajima^1,2, Harutaka Sakai¹ (1.Department of Geology and Mineralogy, Graduate School of Science, Kyoto University, 2.Tono Geoscience Center, Japan Atomic Energy Agency)