University of Isfahan Petrological Journal 2228-5210 6 21 2015 03 21 Determination of Alishar Cu index (Markazi province) formation conditions using mineralography and fluid inclusions data Determination of Alishar Cu index (Markazi province) formation conditions using mineralography and fluid inclusions data 1 18 16201 FA Ahmad Reza Mokhtari Department of Mining Engineering, Isfahan University of Technology, Isfahan, Iran Farimah Ayati اصفهان- سه راه سیمین- کوچه جنب اداره مالیات- مجتمع شهاب- واحد 3- آیتی Hooshang Asadi Harooni Department of Mining Engineering, Isfahan University of Technology, Isfahan, Iran Hashem Bagheri Department of Geology, Faculty of Sciences, University of Isfahan, Isfahan, Iran Marzieh Gaedamini Harouni Department of Geology, Faculty of Sciences, University of Isfahan, Isfahan, Iran Journal Article 2016 06 14 The Alishar Cu-Au index is located in the Markazi province within the Uromieh-Dokhtar magmatic belt. The mineralized zone is hosted by andesitic to andesite basalt lava units, andesitic-andesite basalt tuff and rhyolitic to dacitic tuff (Eocene-Oligocene). The area is affected later by young granodiorite and monzodiorite plutonic units (Oligo-Momiocene). As a result of hydrothermal alterations, phyllic and propylitic alterations as well as kaolinitization and silicification developed in the area. In addition, Cu -Au mineralization has been introduced into the area, mainly associated with silicic veins. Based on geochemical data the Cu and Au contents of the samples are about 0.5% and 0.3 ppm respectively. Also, the Bi content of the studied samples is about 0.5 ppm. The index comprises oxidation, hypogene and supergene zones and contains chalcopyrite, pyrite, chalcocite, magnetite, hematite, goethite and malachite. Fluid inclusion studies of the samples taken from silicic veins show that the homogenization temperature and salinity vary between 200 to 300 °C and 21.6% wt NaCl respectively. On the base of obtained data, it can be concluded that the dominant mechanism for mineralization is the mixing of hydrothermal solutions with meteoritc waters. Geological, mineralogical and fluid inclusion investigations have demonstrated that mineralization in this area is correlated with other IOCG deposits in the world. The Alishar Cu-Au index is located in the Markazi province within the Uromieh-Dokhtar magmatic belt. The mineralized zone is hosted by andesitic to andesite basalt lava units, andesitic-andesite basalt tuff and rhyolitic to dacitic tuff (Eocene-Oligocene). The area is affected later by young granodiorite and monzodiorite plutonic units (Oligo-Momiocene). As a result of hydrothermal alterations, phyllic and propylitic alterations as well as kaolinitization and silicification developed in the area. In addition, Cu -Au mineralization has been introduced into the area, mainly associated with silicic veins. Based on geochemical data the Cu and Au contents of the samples are about 0.5% and 0.3 ppm respectively. Also, the Bi content of the studied samples is about 0.5 ppm. The index comprises oxidation, hypogene and supergene zones and contains chalcopyrite, pyrite, chalcocite, magnetite, hematite, goethite and malachite. Fluid inclusion studies of the samples taken from silicic veins show that the homogenization temperature and salinity vary between 200 to 300 °C and 21.6% wt NaCl respectively. On the base of obtained data, it can be concluded that the dominant mechanism for mineralization is the mixing of hydrothermal solutions with meteoritc waters. Geological, mineralogical and fluid inclusion investigations have demonstrated that mineralization in this area is correlated with other IOCG deposits in the world. https://ijp.ui.ac.ir/article_16201_1df4f7b92690d7e464fbe668f51d4766.pdf