Gis-based Remote Sensing Information To Identify The Mineral Exploration In Eastern Tibet

Tibetan Plateau lies in the east of Alps-Himalaya tectonic gaint mountains chain,which is between Eurasia plate and India plate.It is a geological mine indeed which yearns everybody.Especially to the east of Tibet,because of special terrain and physiognomy,and complicated geological tectonization and distribution of magmatic rock, Tibetan plateau has some geologists and investigators of mineral resource devote themselves to explore and study at there.However,it is difficult to break through the prospecting in some survey areas through using traditional method of prospecting in this bad natrural conditions.We hope to find out the resource of mine which between the earth's surface and the earth's shallow surface,which based on 1:200000 stream sediment survey,or 1:50000 geochemistry stream sediment survey,or 1:10000 soil geochemistry measurement and geological survey with some scales.We have find out some minerals between the earth's surface and the earth's shallow surface,at the sme time,investigators of minerals prospecting will face the new mission of how to use advanced technology .They will through the advanced technology to prospect and find out mineral deposits under the intricated geological physiognomy conditions.The article interprets the geological and alteration information in eastern Tibet through Zuogong-Dongda mountain-Shayi's remote sensing images.It hopes to achive some study fruits about respecting through the nestification of 1:50000 geochemistry stream sediment survey.The article uses NDVI,PCA and ratio analysis to extract the alteration information,and through the choice of optimum bands and directional filter to interpret the main linear body in research areas. At the same time,the article uses the spacial analysis function of GIS to received the spacial changing condition.The interpretting results confirmed the relations of the minerals locus and alteration anomaly,the density of linear body and spacial changing belt of linear body through the combination of 1:50000 geochemistry stream sediment survey.Under the upwards analysis,it chooses three emphases areas as the prospective areas of prospecting.Through the extraction of ETM+ image's alteration,the article interprettes some alteration information.In Dongda mountain survey aeras,the interpretted alteration information distribute the aeras of Paolao, the west of Naenlie and the around of Shalong meadow.In the three alteration in dongda mountain survey areas,Paolao's alteration is the strongest.In the Yanjing survey areas,alteration mainly concentrate the east and the west sides of LanCang river.In Shayi survey areas,alteration lie in the...