2:30 PM - 2:45 PM
*Ryoko Senda1, Akira Ishikawa2, Takeshi Hanyu1, Hiroshi Kawabata3, Toshiro Takahashi4, Katsuhiko Suzuki5 (1.Department of solid earth geochemistry, Japan Agency for Marine-Earth Science and Technology, 2.Department of Earth Science and Astronomy, The University of Tokyo, 3.Faculty of Science, Kochi Univeristy, 4.Department of Geology, Niigata University, 5.Research and Development Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology)