Abstract
This paper presents the results of the detailed mineralogical study of the pocket-disseminated tinzinc (cassiterite-sulfide) and vein-metasomatic tin-silver-polymetallic ores localized in the vent of the Mount Krasnaya paleovolcano (Krasnogorsky polymetallic deposit). The tin-zinc ores of the early Late Maastrichtian stage of the ore formation are associated with pipelike bodies of explosion breccias, were formed at a temperature of around 300°C, and include three mineral assemblages: the (1) pyrite, (2) productive quartz-cassiterite-sphalerite, and (3) late sulfosalt-galena-chalcopyrite ones. The vein-metasomatic tin-silver-polymetallic ores of the late Paleocene stage are associated with rhyolite bodies, controlled by the NW-oriented faults, and cut mineralized breccia. These ores were formed during a full two-stage hydrothermal cycle within the temperature interval from 500 to 1000°C and include five consecutive ore mineral assemblages: (1) wolframite-arsenopyrite, (2) cassiterite-sphalerite-pyrite-chalcopyrite, (3) stannite-Ag-bearing sulfosalt, (4) freibergite-galena, and (5) native silver-stephanite-acanthite. The tin-silver-polymetallic ores are assumed to have formed simultaneously with the extended silver-bearing galena-sphalerite veins cutting the Primorskaya Group volcanic rocks around the paleovolcano. In the extended vein zones, the tinsilver-polymetallic ores correspond to the uppermost (closest to the paleosurface) part of the vertical zoning.
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Original Russian Text © L.F. Simanenko, V.V. Ratkin, V.A. Turchin, 2015, published in Tikhookeanskaya Geologiya, 2015, Vol. 34, No. 2, pp. 44–60.
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Simanenko, L.F., Ratkin, V.V. & Turchin, V.A. Mineral assemblages of the porphyry tin-polymetallic ores of Mount Krasnaya paleovolcano of the Krasnogorsky deposit in the Dal’negorsk ore district. Russ. J. of Pac. Geol. 9, 120–135 (2015). https://doi.org/10.1134/S1819714015020062
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DOI: https://doi.org/10.1134/S1819714015020062