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Teruyoshi IMAOKA
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Tetsumaru ITAYA
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Toshio MATSUMOTO
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Hirofumi YAMASAKI
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Yoshihiro SAWADA
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Author's Organization:Institute of Earth Science,Faculty of Liberal Arts,Yamaguchi University Hiruzen Research Institute,Okayama University of Science., Institute of Geology and Mineralogy ,Faculty of Science ,Hiroshima University Institute of Geology and Mineralogy ,Faculty of Science ,Hiroshima University Department of Geology ,Faculty of Science ,Shimane University