9:45 AM - 10:00 AM
*Akihiko Tomiya1, Yoshihiko Goto2, Tohru Danhara3, Shanaka L de Silva4 (1.Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, 2.Muroran Institute of Technology, 3.Kyoto Fission-Track Co., Ltd., 4.Oregon State University, College of Earth, Ocean and Atmospheric Sciences)