A comparative study of vein type Pb-Zn-Cu±barite occurrences around the mount Zigana (Torul, Gümüşhane, Northeast Türkiye)

The area around the Mount Zigana, which hosts a number of small vein type Pb-Zn-Cu occurrences, is characterised by wide spread argillic alteration. The Zigana region is covered by andesitic and dacitic valconic and volcaniclastic units of Upper Cretaceous intruded by a granitic stock which hosts the Hamsiköy Cu-Mo deposit. Vein type deposits in the region are usually placed along NE-E/NW-W trending fractures and faults. Both in the three areas, deposits contain sfalerite, chalcopyrite, galena and pyrite as the main sulphides, chalcosite, covellite and bornite as the secondary sulphides, zincite and serusite as the oxidation minerals, and quartz and barite as the gangue minerals. Zn/Cd ratios of sfalerites(100-335) and Co/Ni(2-37) ratios of pyrites indicate a genetic link to vein type systems related to granitic intrusions. Hydrothermal alteration is limited to the veins and in the form of silicification in the inner zones and argillic in the outer zones. d34S measurements from pyrite, chalcopyrite, sfalerite and galena vary from ?-0,9 to ?4,9 (n=28) and denote that sulphur is of magmatic origin. Sfalerite-galena, pyrite-galena and pyrite-sfalerite mineral pairs show isotopic equilibrium temperatures in the range 178-3980C. d18O and d18D values obtained from sfalerite, pyrite and barite, and the fluids extracted from them span -3,6 to 11? and ?-16 to-83?, respectively. As a result of the lead isotopes, it?s been determined that mineralizations can be related to magmatic intrusions that are formed due to the bottom shell?s partial fusion. Getting homogenous degrees are set as 100-3630C and salinity as %0,1-62NaCl following the mesaurements on sfalerite, quartz and baryte. To sum up, it can be said that these isotope and fluid inclusion data show that vein type deposits around the Mount Zigana are formed from magmatic fluids diluted partly by meteoric fluids, that they are contemporaneous, and that they are likely to correspond to outer zones of the Hamsiköy porphyry deposit.Key Words: Eskiköy, Istala, Sırganlık, Hamsiköy, Zigana, Mineral Chemistry, Fluid Inclusions, Sulphur-Oxygen-Hydrogen-Lead Isotopes, Isotopic Equilibrium