Alteration Minerals Mapping Using MTMF and CEM Based on ASTER in Zedang Orefield of Tibet, China

Zedang copper polymetallic ore field, including several middle and large skarn-porphyry deposits for large metallogenic scale and special mineralized combination, locates in south rim of Eastern of Gangdise mountains in Tibet. Using the ASTER imagery and MTMF and CEM methods and field sample spectra, the alteration minerals of the Zedang ore field were mapped. From measuring the spectral of rock and mineral using SVC portable spectrograph, it derived consequence of exists some main alteration minerals. According to alteration minerals spectral feature, distribution map of alteration minerals is displayed using MTMF and CEM algorithm. Through compare analysis, it is considered that the CEM approach can suppress the background and extract more accuracy minerals than MTMF method in the high topographic relief area. The result is very important meaning for mineral prospecting.