convener:Hajime Obata(Marine inorganic chemistry division, Atmosphere and Ocean Research Institute, University of Tokyo), Makiko K. Haba(Department of Earth and Planetary Sciences, Tokyo Institute of Technology), Hirochika Sumino(Research Center for Advanced Science and Technology, The University of Tokyo), Mayuri Inoue(Department of Earth Sciences, Okayama University), Chairperson:Hajime Obata(Marine inorganic chemistry division, Atmosphere and Ocean Research Institute, University of Tokyo), Makiko K. Haba(Department of Earth and Planetary Sciences, Tokyo Institute of Technology), Hirochika Sumino(Research Center for Advanced Science and Technology, The University of Tokyo), Mayuri Inoue(Department of Earth Sciences, Okayama University)