Geological, Mineralogical, Geochemical and Fluid Inclusion Studies of Dizelo Lead and Zinc Deposit, Isfahan


Department of Geology, Faculty of Sciences, Lorestan University, Khoram Abad, Iran


The Dizelo lead-zinc deposit is located at the central part of the Sanandaj-Sirjan metamorphic belt, 57 Km Northwest of Esfahan. The main lithological unites exposed in the study area are composed of Jurassic shale and Sandstone, Cretaceous limestone, shale, marl and sandstone. The ore mineralogy is simple; Sphalerite and barite are the main primary minerals. Galena, pyrite and chalcopyrite occur as minor and trace mineral inclusions in sphalerite. Hemimorphite and smithsonite are the main secondary minerals. The most important ore mineral textures include: open space filling, stringer, colloform, crustification, beaded and comb textures. It seems that basinal brines as the main source of the ore-bearing fluids were upwelled along the fault and fractures’ leaching Zn, Pb and trace elements from the shale unites.  Physic-chemical changes caused by the interaction of ore-forming fluid and the carbonate host rocks have provided the effective mechanisms for Pb-Zn ore deposition through cooling, increasing pH, decreasing pressure and H2O dielectric constant and ligands disintegration. Primary fluid inclusion homogenization temperature ranges from 55 to 164 °C, the salinity ranges between 17-25.98 wt. % NaCl equiv, the dolomitization and silicification alterations of carbonate host rocks, the open space filling and replacement textures, the stratabound and epigenetic mineralization, the absence of igneous activity, the ore occurs as replacement of carbonate host rock, the mineralogy and geochemistry evidences all together suggest a Mississippi Valley Type model for mineralization at Dizelo Zn-Pb deposit. Understanding the ore deposition mechanisms of the Dizelo Pb-Zn Mississippian Valley type deposit, which is located in the Northeast of Esfahan, gives a valuable insight for further exploration of the similar ore occrences in the central part of the Sanandaj-Sirjan.


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