*Konstantin Litasov¹、Sergey Voropaev²、Vyacheslav Sevastyanov²、Hiroyuki Kagi³、Hiroaki Ohfuji⁴、Hidemi Ishibashi⁵、Erik Galimov² (1.V.S. Sobolev Institute of Geology and Mineralogy SB RAS, Novosibirsk, Russia、2.Vernadsky Institute of Geochemistry and Analytical Chemistry RAS, Moscow, Russia、3.Geochemical Research Center, University of Tokyo, Tokyo, Japan、4.Geodynamic Research Center, Ehime University, Matsuyama, Japan、5.Department of Geosciences, Faculty of Science, Shizuoka University, Shizuoka, Japan)