Authors
1
Department of Geology, Faculty of Sciences, University of Zanjan
2
Calcimin Company, Zanjan
Abstract
Daveh Yataqi Cu deposit is located ~72 km northwest of Abhar and is part of the Tarom-Hashtjin metallogenic belt. Mineralization occurs as a stratabound zone hosted by the Eocene tuff units. The ore zone has an E-W trend with 60-70˚ to the north and is 200 m in length and 0.5 to 3 m in width. Hydrothermal alteration includes silica, chlorite, carbonate, epidote, and zeolite alteration. Supergene argillic alteration covered the margins of the ore zone. Hypogene chalcocite, bornite, chalcopyrite, pyrite, and native Cu are ore minerals; chlorite, quartz, calcite, epidote, zeolite, and clay minerals are gangue minerals. Supergene chalcocite, covellite, malachite, cuprite, and goethite are supergene minerals. The ore minerals show disseminated, vein-veinlet, vug infill, replacement, exsolution, framboidal, brecciated, relict, and colloform textures. Mineralization at Daveh Yataqi can be divided into four stages. Stage 1 is related to the early diagenesis processes in which disseminated framboidal pyrites are formed within tuff units. Stage 2 is related to the late diagenesis and burial metamorphism processes and is characterized by bornite, and hypogene chalcocite along with minor chalcopyrite with disseminated, vein-veinlets, exsolution, vug infill, and replacement textures. Stage 3 is marked by late quartz-chalcopyrite-pyrite, quartz-chlorite, and calcite vein-veinlets. Stage 4 mineralization is related to supergene processes. Characteristics of the Daveh Yataqi Cu deposit are comparable with the Manto-type deposits.
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