The Application Of Remote Sensing Technology For Porphyry Copper Exploration In The Shangrila- Dege Area

The study area is located in the Shangrila- dege area,which belongs to the Hengduan Mountains,south-eastern Tibetan Plateau. The region has ragged topography,thick vegetation, ice and snow coverage.The elevation of region is more than 4000 m.Because of cold climate, economic backwardness, poor transportation condition, poor field work condition, it is difficult to implement regular mineral resources exploration. Remote sensing image has broad horizon, can truly reflect the relationship between various geological phenomena, in the interpretation of the regional geological information have irreplaceable advantage.This paper chose three regions as typical research area: changdagou、yulong and geza region in the study area based on topographical features.With OLI、ALI and ASTER data, the author studied reproducibility of remote sensing alteration information in research area zhuoma, the result is good.This paper use the ETM + data, OLI data, ASTER data to extract the yulong mineralization alteration information,including the iron-stain alteration information, hydroxyl alteration information, sericite and green rock lithification information.Adopted band group legal, principal component analysis,minimum noise fraction method to extract the sericite information, results in a variety of ways.Based on the tectonic, formation, metallogenic rockbody, regional tectonic,screening the alteration information of porphyry copper, for mineral exploration.This paper summarizes typical porphyry deposit metallogenic elements, chose the five metallogenic elements on the basis of optimization of elements.Based on the remote sensing alteration information, linear structure, circular structure, stratigraphic information to establish a quantitative prediction model, computing research area of metallogenicl favourability degree.Combination of known mining, remote sensing prospecting model of the region is summarized and predict metallogenic prospect areas.By using remote sensing technology, comprehensive analysis of GIS technology, the improvement of process technology and methods of remote sensing alteration information extraction, it improves the accuracy of mineralization alteration information extraction, which can provide references for the regional metallogenic prediction and be more efficient for mineral exploration.