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Yujiro NISHIMURA
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Takahiko MIKAMI
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Morihisa SUZUKI
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Eizo NAKAMURA
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Author's Organization:Institute of Earth Sciences, Faculty of Liberal Arts, Yamaguchi University Elementary and Secondary Education Bureau, Ministry of Education Institute of Geology and Mineralogy, Faculty of Science, Hiroshima University Institute of Mineralogy, Petrology and Economic Geology, Faculty of Science, Tohoku University