شناسايي دگرساني ها و عوارض ساختماني به وسيله تصاوير ETM+ و اطلاعات توپوگرافي براي پي جويي كانسارهاي طلاي هيدروترمال در منطقه دليجان

Targeting Structural Features and Alteration for Reconnaissance of Hydrothermal Gold Mineralization in Delijan Area Using DEM and ETM+ Data

Delijan area, which Muteh gold mines and deposits are located in, is one of the most prospective gold mineralization areas in Iran. Recent investigations on Muteh gold deposits, opposing previous studies, have proposed that a wide range of rock formations might embrace promising gold mineralization.deposits in the area. However, negative image of the fourth component of Crosta method applied on the bands 1, 3, 4 and 5 for mapping iron oxide bearing alteration minerals did not establish a mutual relation with known gold deposits in the area. Since they may provide conduits for hydrothermal fluids, structural features are important indicative features towards hydrothermal gold mineralization. In order to extract structural features, the RGB color composite image of bands 7-4-2 converted to the HSV color mode, and then the V component replaced by hill-shade images produced by illustrating DEM at eight different azimuths. Subsequently, main structural features visually interpreted from RGB and DEM synthetic images. To map hydrothermal mineralization alteration in the area, the selective PCA method of Crosta was applied on the ETM+ bands of 1, 4, 5 and 7, and imag of the fourth component of the analysis adequately derived hydrothermally altered rock bearing hydroxyl minerals which fairly correlate with known gold