The Mayskoye disseminated gold deposit, Chukotka, Russia: mineral paragenesis, fluid inclusion, and oxygen and sulfur isotope studies

摘要

New data on mineral paragenesis, mineral chemistry, fluid inclusions, oxygen isotopes of quartz, and sulfur isotope compositions of sulfide minerals from the black shale-hosted Mayskoye disseminated gold deposit are presented. Three distinct mineralization stages include: (1) disseminated sulfide minerals, (2) wolframite-cassiterite-quartz veins, and (3) quartz-stibnite veins. Several compositionally and isotopically distinct fluids were involved in the Mayskoye hydrothermal system. Both unmixed into a low salinity, H_2O+CO_2+CH_4 liquid and a CO_2+ H_2O vapor-rich phase, with economic disseminated gold ores deposited at 238°-430°C and 0.2 to 1.2 kbar.