Abstract-Sulfur isotope data of sulfide and sulfate minerals from the Kuroko-type deposits of the Miocene age (63 samples of mill concentrates and 48 separate specimens) and from the later Paleozoic so-called Kieslager-type deposits (20 samples of mill con centrates and 11 separate specimens) are reported.The data of sulfides from the Kuroko-type deposits can be divided into two groups , i.e., a lower P'S group of which deposits in the Ohdate area are representative and a higher S34S group characterized by deposits in the Kosaka district. A remarkable differ ence between the Kuroko-type and the Kieslager-type is that the average sulfur isotopic fractionation factor between sulfides and contemporaneous sea-water sulfate is slightly larger in the Kuroko-type deposits than in the Kieslarger-type deposits.
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