Vein-type copper mineralization in the Zarandieh area based on mineralogy, geochemistry and fluid inclusions studies, Saveh, Markazi province

The Zarandieh district is situated approximately 42 km northeast Saveh (Markazi province) and in the northwestern part of the Urumieh-Dokhtar magmatic belt. In this area, mineralization is hosted by Eocene andesitic lava and Oligo-Miocene diorite and gabbroic rocks. According to the geochemical evidence, parental magma of igneous rocks is calc-alkaline, metaluminous and related to continental margin volcanic arcs. Mineralization has been observed as veins, veinlets and brecciated forms in diorite and gabbroic rocks. The main ore mineral is chalcopyrite and associated with pyrite, bornite, oligist, chalcocite, covellite, neotosit, native copper, malachite, azurite, chrysocolla, goethite and limonite. Cu grade in the ore samples are varied from 0.04 to 1.7 % (0.40 % in average). Statistical analyses of geochemical data from mineralized samples by Pearson method displayed that Cu has maximum correlation with Ag, As, Zn, Cd and Pb, respectively. Microthermometry studies of fluid inclusions show that the average homogenization temperature is 195° C and the average salinity of 23 wt% NaCl. The Zarandieh Copper mineralization is closely related to hydrothermal vein copper deposit types.