Ph.D. Tezi Görüntüleme
Arzular mineralization (Gümüşhane, NE Turkey) has emplaced as fault-controlledinto NE-SW trending and NW dipping, and also about EW trending and North dipping
fractures within the Eocene aged Alibaba Formation. The main mineralizations havedeveloped along a N70E trending fracture zone in Kuzdağı Sırtı area. Ore-bearing silica
veins exhibit 0.1-0.3 m thicknesses and do not show continuity in the field. Cavity-fillingand banded structures are widely observed in mineralizations. The main ore minerals consist of
galena, sphalerite, pyrite, chalcopyrite and tetrahedrite, and also trace amounts of gold.Mineral chemistry analyses indicate that pyrite contains low Co and Ni values, Zn displays
a negative correlation with Cu and Fe in chalcopyrites, Fe behaves similarly with Cd andMn in sphalerites and there is an ion exchange between Zn and Fe. In addition, it was
determined that all fahlerz minerals are tetrahedrite in composition and silver does notexist in galenas except tetrahedrites.
Quartz, sericite, K-Feldspar, kaoline, Fe chlorite, albite, Mg chlorite and epidote aremost common alteration minerals from ore towards wall rock. Zr, Hf, Nb, Al and Ti are
immobile elements in the profiles that laid out along a line perpendicular to the vein.Relative (%) and net (g/100g) mass change calculations done considering these immobile
elements indicated mass gains in 1, 3 and 5 numbered profiles, mass losses in 2 and 4numbered profiles.
Homogenezation temperatures measured from fluid inclusions are between 130°C -295 °Cin quartz and 90°C -133°C in sphalerites. In NaCl±KCl±MgCl2-H2O system, ore-forming fluids
have salinities between 0.7 and 12.4 wt. % NaCl eq and densities between 0.79 and 0.97 g/cm3.These values reveal that minerilazations were generated in an epithermal system. Sulphur
isotope analysis results obtained from pyrite, galena and sphalerite minerals are between -1.2 ‰ and 3 ‰, marking magmatic origin for sulphur. The average heat of formation was
calculated as between 244°C and 291°C by sulphur isotope thermometry. Oxygen andhydrogen isotope values are between 15.0 ‰-16.7 ‰ and -87 ‰ -91 ‰, respectively.
Key Words: Gümüşhane, Arzular, Epithermal, Gold, Mass Gains and Losses, FluidInclusions, Stable isotope