Document Type : علمی -پژوهشی
Authors
1
Ph.D Student in Economic Geology, Islamic Azad University, Science and Research Branch, Tehran
2
Associate Professor, Department of Geology, Islamic Azad University, North Tehran Branch
3
Associate Professor, Department of Geology, Shahid Beheshti University
4
Associate Professor, Department of Geology, Islamic Azad University, Science and Research Branch, Tehran
Abstract
One of the potential areas for metal indices such as iron is located in the North East part of Isfahanand. There are extensive outcrops of granitoid mass in the studied area and its surroundings (karkas granite) which have been cut most stratigraphic units before Oligo-Miocene. Lithology of the area consists of fine to coarse sandstone, massive dolomite, and cream-colored limestone with fossils and massive intrusive in the region. According to its frequency, quartz monzonit, quartz monzodiorite, granodiorite and granite are the most abundant which are formed from subduction zone before collision and are the type (VAG). In terms of magmatic arc these are calc-alkaline series (CAG), which dactial tails has penetrated through these granites. Volcanic rocks include porfirodacite, andesite and quartz latite with the age of Pilocene to Miocene. Iron was originated from semi-deep magma with high heat, passing fiuids with elements to above horizons and attack limestone and dolomites creating skaran, with mineralogical composition of andradite, gersular, hesonite, epidote, lipidcrolite, zeoizite, and hedenberzite. In addition, hydrothermal fluids resulting in minerals alteration and formation of kaolinite, chlorite, montmorillonite and sericite. The supergene phenomenon has important role in enrichment of iron ore in surface, which main evidences is cap iron (gossan). Kamoo iron mine is located above it and mainly consist of iron ore minerals such as magnetite, hematite, limonite, goethite and other Parageneticmenirals.Magnetite and sulphide mineral such as pyrite and chalcopyrite and with magmatic origin are the first generation of skarn mineralization. Alteration by magmatic fluids is the second generation and supergene phenomenon are third generation of mineralization (forming hematite, limonite, covelite and goethite) in kamoo region. Thus, the main genesis of iron ore in kamoo is epigenetic hydro-thermal.
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