1. Department of Geology and Mineralogy, Graduate School of Science, Kyoto University, Oiwakecho, Kitashirakawa, Sakyo-ku, Kyoto City, Kyoto 606-8502, Japan
2. Research Fellow of Japan Society for the Promotion of Science
3. School of Natural System, College of Science and Engineering, Kanazawa University, Kanazawa City, Ishikawa 920-1192, Japan