Mineralogical And Microthermometrical Studies On The Gonharan Lead-Zinc Deposit, Daran, Isfahan Province
DOI:
https://doi.org/10.63278/mme.vi.1892Abstract
The Gonahran lead-zinc deposit in Isfahan is located in the central part of the Sanandaj-Sirjan zone and is situated along northwest-southeast trending faults. The primary mineralization is hosted in Cretaceous limestones and occurs as silica-carbonate veins containing sulfides of lead, zinc, and copper. The style of mineralization varies across the deposit. In the western part, it appears as a network of lead veins within a dolomite and calcite gangue. In the eastern section, mineralization occurs as masses, lenses, and pockets parallel to the layering at the contact with metamorphic sandstone and shale. Mineralogical studies show that galena is the main ore mineral, with minor amounts of pyrite, sphalerite, and chalcopyrite. Analysis of fluid inclusions indicates formation temperatures between 160 and 180°C and a salinity range of 5 to 21%. This wide range of temperature and salinity suggests the mixing of hydrothermal and meteoric waters, a process considered crucial for concentrating the ore. Based on this data, the Gonahran deposit is classified as a Mississippi Valley-Type (MVT) deposit, with a minimum formation depth estimated at 80 meters.
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