*Norikatsu Akizawa1,2, Akira Ishikawa3, Tetsu Kogiso4, Katsuhiko Suzuki5, Akira Miyake6, Itaru Mitsukawa6
(1.Department of Ocean Floor Geoscience, Atmosphere and Ocean Research Institute, The University of Tokyo, 2.Macquarie University, 3.Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 4.Graduate School of Human and Environmental Studies, Kyoto University, 5.Submarine Resources Research Center, Japan Agency for Marine-Earth Science and Technology, 6.Department of Geology and Mineralogy, Kyoto University)