11:45 AM - 12:00 PM
*Kohei Kazahaya1, Yoko Togo1, Hiroshi Takahashi1, Masaaki Takahashi1, Masaya Yasuhara1, Tsutomu Sato1, Keika Horiguchi1, Noritoshi Morikawa1, Hikaru Iwamori2, Hidemi Tanaka3 (1.Geological Survey of Japan, AIST, 2.Geochemical Evolution Research Program, Japan Agency for Marine-Earth Science and Technology, 3.School of Science, The University of Tokyo)