Writers : Shole,Ali;Rastad,Ebrahim;Babakhani,Ali Reza;Askari,Ali
Refference : The 23th Symposium on Geoscience;Tehran
Publishing Year : 1383

Abstract :
Chah-Calap W-Sn-(Cu-Zn-Au) deposit is situated 100 kilometers south-southeast of Birjand, in central Iran structural zone in the northeast margin of Lut block. Upper Triassic-Jurassic volcanosedimentary sequences including metapellite, metafelsic volcanic, metacarbonate and mylonitic granite underwent upper greenschist-lower amphibolite regional metamorphism. Major ore horizon occurred along the contact between metacarbonates and metafelsic volcanics in relation with cherty limestone facies. N85E trending Stratiform ore body with layered and lenticular geometry can be followed up to 2 kilometers. Ore mineral assemblage includes scheelite, ferberite, chalcopyrite, sphalerite, pyrite, arsenopyrite, stibnite, covellite, bornite and pyrhotite which have massive, disseminated, laminated, geod like, vein and veinlet, open space filling and breccia textures. In metacarbonates three different facies can be distinguished in which mineralization in calc-silicate band is restricted in cherty limestone facies. Tungsten mineralization in Chah-Calap is considered to be of synsedimentary-syndiagenetic type with exhalative origin. Diagenetic processes lead to primary concentration of mineralization which later experienced remobilization and reconcentration during regional metamorphism. Chah-calap mining-geological characteristics can be used as an exploratory tool for reconnessanse and exploration of similar tungsten deposits in other parts of Iran especially because of vast extention of upper Triassic-Jurassic volcano-sedimentary sequences in eastern Iran and Sanandaj-Sirjan zones.
Subject List : polymetal