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23 rd Using Satellite Images (ASTER Images, TERRA Satellite) for Exploration of Orogenic Gold Deposits (Case Study: Dareh Ashki Gold Deposite, Muteh Gold Complex, Golpayegan, Iran) A. Mohammadi Department of Geology, Science and Research Branch, Islamic Azad University, Tehran, Iran A. Khakzad, Department of Geology, Science and Research Branch, Islamic Azad University, Tehran, Iran N. Rashidnejad Omran, Department of Geology, Tarbiat Modarres University, Tehran, Iran N. Kaviani Department of Soil Sciences, Khorasgan Branch, Islamic Azad University, Isfahan, Iran ABSTRACT In recent years, remote sensing technology has provided valuable information in the field of mineral exploration. Satellite data have been used widely in geology and exploration and to determine the location of mineral deposits. The remote sensing techniques, has been used significantly in the updating of geological maps, improved quality, and thematic mapping such as alteration zones maps, rock units, lineaments and fracture patterns, and has saved time and cost of in mineral potential mapping. This project was conducted in the Darehashki Gold deposit with 2.45km 2 that is located in extreme NW of Isfahan province and north of Muteh village. The deposit is one of the ninefold gold deposits formed in Muteh Complex which occurred in central of Sanandaj– Sirjan structural–metamorphic zone. Lithological investigations show that the geological units in this area include: Precambrian metamorphic (green schist facies with different mineralogy) hornfelse, silicified and mineralized veins and granitic intrusions. This series have been deformed in effect of tectonic alternating phases. Gold mineralization has occurred in relation to hydrothermal alterations in metamorphic units (schists and quartz veins in schist-granite contacts).Gold-containing minerals include pyrite and chalcopyrite. In this project, ASTER satellite images were used in different band combinations for extraction alteration zones associated with gold deposits, fractures and faults systems, intrusive units according to their possible role in the mineralization area and relationship between alteration zones and fracture systems and faults were investigated. According to the results of field survey and the availability of gold alteration zone-as an indicator- in the area, were provided an opportunity for assessing the accuracy, control and compare the results of remote sensing studies with field studies Finally, remote sensing studies for in this district can be used as a model for exploration of similar areas. 177
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