Ore Mineralogy of High Sulfidation Çorak-Taç Epimesothermal Gold Deposit (Yusufeli-Artvin-Turkey)


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Diarra K. A. , Sanğu E. , Çiftçi E.

Congress for Applied Mineralogy (ICAM2019), Belgorod, Rusya, 24 - 27 Eylül 2019, ss.53-58

  • Basıldığı Şehir: Belgorod
  • Basıldığı Ülke: Rusya
  • Sayfa Sayıları: ss.53-58

Özet

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.