Delineation of hydrothermal alteration Zones for porphyry systems utilizing ASTER data in Jebal barez area, SE Iran

Abstract: The Urumieh-Dokhtar Magmatic Belt (UDMB) is the host of many Iranian Cu porphyry deposits. Southern part of this belt, in the range of geological Jebal barez, has been less investigated because of the mountainous and rough topography and also some security confrontation. Porphyry deposits are associated with hydrothermal alteration zones can be mapped using remote sensing data such as Advanced Space borne Thermal Emission and Reflection Radiometer (ASTER) which flying on the Terra satellite to record radiation in 14 spectral bands. The aim of this study is to identify and detect the alteration Zones which associated with porphyry systems utilizing ASTER data in Jebal barez area, SE Iran. In this reason, seven scenes of ASTER level-1B data which cover the Jebal barez area were pre-processing and then process by band ratio, false color composite and Spectral Angele Mapper (SAM) methods. Result indicates the presence of extensive phyllic and argillic alteration zones. The argillic alteration is surrounded by border zones of propylitic alteration. Also a massive granitoid intrusion in NW of the studied area is detected by SAM method and color composite of 4,6 ,8 band of aster as a completely altered area ( SF area) which strongly recommend for more detailed exploration and field inspection.