The Berezitovoe gold-polymetallic deposit (Upper Amur region, Russia):Structure, mineralogy and genetic aspects

摘要

The Berezitovoe deposit in the Sergachi volcano-plutonic and metallogenic belt preserves evidence for polymetallic mineralization of multiple stages. The steeply dipping garnet-tourmaline-muscovite-quartz metasomatites (with K-Ar ages of 132 ? 2.9 and 127 ? 4.4 Ma) carry two distinct stages of mineralization developed at different times:(1) polymetallic mineralization and (2) gold-quartz. The deposit is located within Paleozoic gneissose granitoids of the Pikansky complex (dated as 379 ? 1.1 Ma by zircon U-Pb method) intruded by early Cretaceous porphyry-like granites of the Haikta pluton (dated as 137 ? 0.67 Ma by zircon U-Pb method) and late Cretaceous dikes of porphyrites, porphyries, and lamprophyres. Evidence suggests the action of late gold-bearing hydrothermal fluids on the early pol-ymetallic ores and the selective mobilization of some elements from these lead to redeposition together with complex sulphosalts.