Using remote sensing technology for the determination of mineralization in the Kal-e-Kafi porphyritic deposit, Anarak, Iran

The Kal-e-Kafi is located in the northeast of Anarak, Central Iran. The Central Iran contains several Tertiary porphyritic deposits, which are important sources for Cu, Mo and locally Au. In this research, the aim is search for exploration targets by remote sensing technology in Anarak. Landsat TM data were used to study petrology, hydrothermal alterations and tectonic structures. Different approaches were used in this project such as band ratioing, principle component and digital filtering. The structures were identified using low pass filter, edge sharping detector filter, Laplacian detector and Sobel edge detector. As a result, two limiting ring structures as well as a number of faults have been located in Kal-e-Kafi prophyry deposit. RGB TM175, RGB TM735 and RGB TM531 methods were used to determine rock unites. By this method, several rock units have been determined; such as porphyritic diorite, granodiorite, granite and monzogranite as well as dacite, andesite, trachyandesite, carbonates, marble and schist. The developed selective method on bands of TM1, TM4, TM5 and TM7 as well as TM1, TM2, TM3, TM4, TM5 and TM7, in addition TM5/TM7, TM5/TM4, TM3/TM1 ratios of Landsat-TM were used for determination of alteration haloes around this porphyritic deposits. Based on the studies mentioned above, it is suggested that five areas are favorable for further exploration.