Geology and mineral chemistry features of Köprüyanı (Maçka-Trabzon) Cu-Skarn mineralization

In this study, it is aimed to determine the geology, petrography, ore microscopy properties and mineral chemistry content of Cu-Skarn mineralization in Köprüyanı locality within the borders of Trabzon province in the Northern Zone of the Eastern Pontides. Actinolite, tremolite, pyrite, chalcopyrite, magnetite and malachite minerals; and limonitization, hematitization, chloritization and epidotization type alterations developed along the fractured crack zones are observed in the Köprüyanı mineralization area. Magnetite minerals are generally found together with chalcopyrite, pyrite and garnet, TiO2 contents are very low (0.02-1.02%), whereas FeOt contents vary between 83.13-92.00%, and their species are titonamagnetite. It has been determined that the Cu content of the chalcopyrite minerals found together with magnetite and located in the exoskarn zone varies between 33.50-43.27% and the Fe content varies between 29.84-39.11%. It was determined that Al contents of epidote minerals were high (2.06-2.46), Mn contents were low (0.01-0.03) and Fe+3 contents were relatively high (0.59-0.96). It has been determined that the type of epidotes rich in Al is clinozoisite. Garnet species are predominantly andradite and grossular-andradite. According to the Pyrop+Almandine+Spessartin–Grossular-Andradite triangular diagram, Köprüyanı mineralization is found to be located in the Cu-Skarn area. Based on the data compiled within the scope of ore microscopy and mineral chemistry studies, it was concluded that Köprüyanı mineralization is of Cu-skarn type and shows similar features in paragenesis, succession and mineral chemistry data when compared to that of the existing skarn mineralizations in the region.