Sequence of mineral formation in clastic ores of the Saf’yanovka volcanic-hosted copper massive sulfide deposit,the Central Urals |
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| Authors: | N P Safina V V Maslennikov |
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| Institution: | 1.Institute of Mineralogy, Ural Division,Russian Academy of Sciences,Miass, Chelyabinsk oblast,Russia |
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| Abstract: | The bedded clastic ore widespread on the slopes and flanks of the deeply eroded sulfide mound at the Saf’yanovka volcanic-hosted
copper massive sulfide deposit consists of products of destruction of the Paleozoic black smoker along with diverse newly
formed sulfides. The size of ore clasts gradually decreases with distance from the massive ore mound, from more than tens
of centimeters to a few millimeters. The clastic sediments are characterized by good preservation of sulfide material composed
of hydrothermal sedimentary colloform pyrite, chalcopyrite with lamellae of relict isocubanite, and concentrically zoned sphalerite.
Numerous pyrite framboids, nodules, and euhedral crystals; chalcopyrite segregations; and twinned sphalerite are typical of
sulfide-bearing black shale. Enargite, tennantite, and galena were formed after pyrite, filling interstices between nodules
or partially replacing and corroding the previously formed minerals. The interrelations between minerals show that the fine-clastic
sulfide-bearing black shale underwent diagenesis in the presence of organic matter. |
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