Application of structural data, chemistry of sulfide minerals and fluid inclusion in mineralization type determination of Zn-Pb carbonate hosted Gardaneshir ore deposit in Southwest Ardestan


Department of Geology, Faculty of Basic Sciences, Tarbiat Modares University, Tehran, Iran


Gardeneh-Shir zinc and lead deposit is located at 38 km southwest of Ardestan in Central Iran. The host rocks of this deposit includes carbonates of Middle Triassic Shotory Formation juxtaposed over Upper Triassic Naiband Formation by thrust faulting. The mineralization in these deposits is in the form of vein-veinlet, breccia and filling of karstic cavities with dolomitization and silicification and mainly controlled by Strike-slip faults with the normal component and normal faults with strike slip component those are cross cutting older generation of thrust faults. The results of fluid inclusion studies of on quartz and dolomite in Gardeneh-Shir deposits Area show a fluid with a salinity of 23.2-18.6% by weight of salt, temperature range of homogeneity between 91 -162 ° C and a density of 1.09-1.056 g/cm3. The combination of fluid inclusion and EPMA analysis of Zn / Cd (879%) elemental ratios in sphalerite mineral has confirmed low temperature generation of Gardeneh Shir deposit. According to the results of our studies including host rock type, mineralogy, mineralization control structures, salinity and temperature it can be considered that the mineralization of zinc and lead are the mining region of Gardeneh-Shir deposits in the category of MVT type deposits


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