عنوان مقاله [English]
Abri and Rahbari deposits are located 23 km NW Darooneh and are located in the part of the Khaf-Darooneh volcanic-plutonic belt and the Sabzevar Sub- Zone. The studied area rock units consisted of three categories with the age of Middle Eocene include: 1- submarine lava (andesite, basalt, porphyry andesite-basalt, trachy andesite), 2- pyroclastic (tuff and agglomerate) and 3- sedimentary (limestone, limestone marl, Siltstone and shale). The volcanic rocks belong to medium to high K calc-alkaline magmatic series and have been formed during a volcanic arc tectonic regime of active continental margin. Mineralization in Abri and Rahbari areas has occurred, on the border of limestone units with pyroclastic rocks and lava as strata bound and the mineral is formed as veins and vein- veinlet, cavities and open space filling and disseminated. the main minerals formed the deposits are classified in three groups of sulfide minerals (chalcocite, covellitis, bornite, chalcopyrite and pyrite), carbonate minerals (malachite, azurite) and oxide minerals (cuprite, magnetite, hematite and limonite). Based on the micro thermometry studies the average of fluid inclusions homogenization temperature in Abri and Rahbari area is 198 ˚C and The average of salinity is 8.9 wt% NaCl. Based on the geochemical studies copper in the base metals has the highest production coefficient (The equivalent of 4 to 5 weight percent). According to the studies, it can be said that mineralization in the Abri and Rahbari area is epigenetic, strata bound that is similar to the manto type copper deposits.