Ikuya Nishio¹, Tomoaki Morishita¹, Kristoffer Szilas², Akihiro Tamura¹, Juan-Miguel Guotana¹, Kenichiro Tani³, Yumiko Harigane⁴ and D. Graham Pearson⁵, (1)Kanazawa University, Department of Earth Science, Kanazawa, Japan, (2)University of Copenhagen, København K, Denmark, (3)National Museum of Nature and Science, Ibaraki, Japan, (4)Geological Survey of Japan, AIST, Research Institute of Geology and Geoinformation, Tsukuba, Japan, (5)University of Alberta, Earth and Atmospheric Sciences, Edmonton, AB, Canada