Geology, mineralization and geochemistry of the Hashemabad Cu deposit (south of Naein)


1 Research Institute for Earth Sciences, Geological Survey of Iran, Azadi Sq., Meraj-street, Tehran-Iran

2 Senior exploration expert of Samane Kansar Zameen Company, Tehran


Hashemabad deposit is located in southeastern part of Esfahan province (Naein), in Central-Iran Zone and within Cretaceous-volcanic rocks. This system is a part of Naein-Ardestan basin which consists of Cretaceous sub-seafloor lava, volcano-sedimentary rocks, and ultrabasic-rocks which formed in extensional environment. This complex located in a tectonic zone (strike-slip fault) adjacent to Urumieh-Dokhtar magmatic arc. Main altered and metamorphosed rocks in this area include Middle-Upper Cretaceous basaltic-lava, andesite, basaltic-andesite, rhyolite and rhyolitic-tuff and younger subvolcanic masses which emplaced in relation to strike-slip faults. Andesite and basaltic andesite which well distributed in whole area are the main host of copper mineralization. Propylitic, argillic, sericitization, silicification, carbonatization and sulfidation are main alterations which well distributed along fault and fractures. However, the intensity of silicification and carbonatization increases in proximity of the mineralized zone. Ore mineralization generally is concomitant with bedding of host basaltic andesite lava in form of disseminated and lens shape and has observed with stratabound geometry along local and cross-cutting faults. Ore minerals have vein-veinlet, open space-filling, disseminated and replacement textures. Ore minerals include chalcocite, bornite, chalcopyrite and pyrite along with secondary minerals such as covellite, chalcocite, malachite, hematite, goethite and azurite. Geochemical studies proposed high potential and enrichment of copper (less Ag&Mo) in this area. The presence of relatively good amounts of gold in tuff units containing jasper as well as in the place of argillic-alteration is one of the unique features of this area. Considering the above evidences, this deposit could be considered as Manto type copper deposit.


Main Subjects

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