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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