convener:Hidenori Terasaki(Faculty of Science, Okayama University), convener:Eiji Ohtani(Department of Earth and Planetary Materials Science, Graduate School of Science, Tohoku University), William F McDonough(Department of Earth Science and Research Center for Neutrino Science, Tohoku University, Sendai, Miyagi 980-8578, Japan), convener:Riko Iizuka-Oku(Geochemical Research Center, Graduate School of Science, The University of Tokyo), Chairperson:Hidenori Terasaki(Faculty of Science, Okayama University), Eiji Ohtani(Department of Earth and Planetary Materials Science, Graduate School of Science, Tohoku University), William F McDonough(Department of Earth Science and Research Center for Neutrino Science, Tohoku University, Sendai, Miyagi 980-8578, Japan), Riko Iizuka-Oku(Geochemical Research Center, Graduate School of Science, The University of Tokyo)