Mineral Composition and Metamorphic Conditions of the Host Rocks of the Gorevskoye Polymetallic Deposit (Yenisei Ridge, Krasnoyarsk Region, Russia)

The Gorevskoye deposit (Yenisei Ridge) is one of the largest polymetallic deposits localized in metamorphic rocks. Despite the long history of study, there is still no consensus on its genesis. Considering the important role of metamorphic transformations in recrystallisation and formation of ore appearance, assessments of the metamorphic conditions that affected the host rocks are the basis for reconstructions of the deposit genesis. Previously, such estimates were made approximately using mineral paragenesis in the rocks. This paper presents the results of studying the temperature conditions of metamorphic transformations of the host rocks of the Gorevskoye deposit using a geothermometer based on Raman spectrometry data of carbonaceous material, as well as traditional methods of mineralogical thermometry. The data obtained allowed us to estimate the peak temperature values of regional metamorphism at 490-530 °C with good convergence of the results of different methods. It is also found that the rocks were transformed by hydrothermal processes at temperatures around 345-365 °C during the post-metamorphic stage.