*Shigeru Sueoka¹, Hideki Iwano^2,3, Tohru Danhara², Takafumi Hirata³, Melanie Kranz-Bartz^4,5, Georgina E. King⁵, Takahiro Tagami⁶ (1.Tono Geoscience Center, Japan Atomic Energy Agency, 2.Kyoto Fission-Track Co., Ltd., 3.Geochemical Research Center, Graduate School of Science, The University of Tokyo, 4.Institute of Geology, Mineralogy, and Geophysics, Ruhr-University Bochum, 5.Institute of Earth Surface Dynamics, University of Lausanne, 6.Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University)

*Jun Hosoi¹, Hideki Iwano^2,3, Tohru Danhara² (1.Department of Earth Sciences, College of Science, Ibaraki University, Japan, 2.Kyoto Fission-Track Co., Ltd., 3.Geochemical Research Center, The University of Tokyo)