Using Spectral Angle Method to Detect Alterations in Sheets of Mokhtaran and Sarchahshur
Z. Khajehmiri, M. R. Shayestehfar, H. Moeinzadeh
Remote sensing has great importance in exploring mineral deposits especially in arid and semi-arid areas. Identifying altered rocks through remote sensing has been successfully used for the exploration of mineral deposits, especially porphyry copper and gold. In this study, spectral angle method and false color composite were used for processing the ASTER and Landsat images. To detect iron oxides, Landsat 8 images were used, and to detect the minerals such as sericitic, kaolinite, chlorite and epidote. ASTER images were used. In this study, Kaolinite mineral was used for argillic alteration, chlorite and epidote minerals were used for propylitic alteration, sericitic and quartz minerals were used for phyllic alteration, and several areas were selected based on detected alterations. Previous studies in the areas 2, 3, and 4 (in northern parts) introduced this region as epithermal and porphyry systems. The areas 6, 5, 1, were selected for field studies. The area 5 and 1 has the alteration and geology similar to areas 2, 4, and 3. The results of the analysis of mineralized samples taken from areas 5 and 6 showed that these areas have anomaly for the copper, but the area 6 similar to areas 2, 3, 4, and 5 in terms of geology and alteration. Therefore, areas 5 and 6 are recommended for exploration operation.