11:00 AM - 11:15 AM
*Kazuhiro Miyazaki1, Takeshi Ikeda2, Hideki Iwano3,4, 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)