Sulfur isotopic characteristics of late Cenozoic ore deposits at the arc junction of Hokkaido, Japan |
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Authors: | Shunso Ishihara Akira Sasaki |
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Institution: | Department of Earth and Planetary Sciences, Hokkaido University, Sapporo 060, Japan;Department of Education, Ibaraki University, Mito 310, Japan |
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Abstract: | Abstract Sulfide minerals of late Cenozoic vein-type deposits of southwest Hokkaido and Kuril Islands yielded δ34CDT S values of 2 to 8 permil, which are typical green-tuff values of magnetite-series igneous terrane. Sulfides of the Kitami district of northeast Hokkaido, on the other hand, are characterized by negative δ34SCDT values, ranging from 0 to - 7 permil. This unique value among ore deposits in the late Cenozoic back-arc terranes in the Japanese Islands is considered to have resulted from extraction of 32S enriched sulfur from the basement rocks, because of well-developed N-S fracturing in the basement, which is characteristic of the axial belt and Kitami district of Hokkaido. |
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Keywords: | back-are magmatism fore-are magmatism Hokkaido ilmenite series Kuril Islands magnetite series ore deposit sulfur isotope |
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