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Toshiya Kanamatsu
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Futoshi Nanayama
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Keiji Iwata
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Yoshiki Fujiwara
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Author's Organization:Department of Geology and Mineralogy,Faculty of Science,Hokkaido University Department of Geology and Mineralogy,Faculty of Science,Hokkaido University Department of Geology and Mineralogy,Faculty of Science,Hokkaido University Department of Geology and Mineralogy,Faculty of Science,Hokkaido University