Congress for Applied Mineralogy (ICAM2019), Belgorod, Russia, 24 - 27 September 2019, pp.53-58
Abstract. Çorak and Taç, two nearby mineralizations, are located in the eastern black sea region, which is one of the most productive metallogenic belts of Turkey. It is characterized by a great number of Kuroko-type volcanogenic massive sulﬁde deposits as well as vein-type polymetallic deposits, porphyry and epithermal precious metal deposits. Subject neighboring deposits are hosted within the voluminous Cretaceous-Eocene granitoids and interbedded volcanic rocks and carbonates. Mineralogy of altered host rocks include quartz veins, carbonates, sericite, chlorite, chalcedony, and disseminated sulﬁdes - mainly pyrite, sphalerite, galena, and chalcopyrite. The main texture encountered in the host rocks is hyalo- porphyry. Due to hydrothermal alterations primary minerals are mostly altered in which the ferromagnesian minerals are chloritized and calciﬁed, while feldspars are altered into sericite, calcite, and albite. Siliciﬁcation and argillic alteration (medium, moderate, high) are widely spread however; XRD analysis carried on 33 core samples from Çorak has also revealed local propylitic alteration, limoniti- zation and hematitization as well. The minerals assemblages that accompanied the different alterations include jarosite and alunite suggesting high sulﬁdation hydrothermal mineralization. Through the ore microscopic studies, pyrite, chal- copyrite galena, sphalerite, and a lesser amount of sulfosalts (tennantite- tetrahedrite and pyrargyrite) were determined. Quartz and calcite account for the main gangue minerals. While the Taç mineralization is pyrite, chalcopyrite and sphalerite dominating, the Çorak mineralization contains relatively less chal- copyrite and galena becomes prevalent with sphalerite. Gold in both sites may reach up to 10 ppm, on average 3 ppm. Silver occurrence is insigniﬁcant.