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G. Kimura
Dept. of Geology, Graduate School of Science, University of Tokyo.
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T. C. Onishi
Dept. of Earth and Planetary Sciences, Graduate School of Science, Hokkaido Univ.
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Y. Hashimoto
Dept. of Geology, Graduate School of Science, University of Tokyo.
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J. Ashi
Dept. of Geology, Graduate School of Science, University of Tokyo.