Extraction of Alteration Information and Establishment of Prospecting Model for Porphyry Copper\|gold Deposits in Luzon

In order to build the remote sensing prospecting model for porphyry copper\|gold deposits and delineated prospecting target area in the porphyry copper\|gold deposits strategic area of Cordillera Central in Luzon (Philippines)，the geological background of the porphyry copper\|gold deposits and the spectral characteristics of the main altered minerals are analyzed in detail，and the mineralizing alteration information is extracted from ASTER remote sensing data using the Crosta technique.To increase the proportion of weak alteration information which is hard to extract，a principal component analysis (PCA)approach based on object’s character was proposed in this paper.The principle of this approach is that calculating the feature vector based on the specific alteration mineral and applying them in the whole study area in PCA，which can enhance the weak alteration information in a directed way and avoid the strong background information and noises.On the basis of the approach iron dye，argillization and propylitization alteration information are extracted precisely.After consider the ore\|controlling structure，rock mass and alteration information comprehensively，A remote sensing geological prospecting model of porphyry copper\|gold deposits in the study area is established and finally 6 preferable ore\|finding area are delineated.