The Study And Application Of Extracting Remote Sensing Mineralized Alteration Information In Kuangguer Of XinJiang

The anomaly is the inpendent parameter ,such as bouguer gravity anomaly,regional chemical anomaly,aeromagnetic anomaly.We have a new method of discovery ore since the Lansat-4 has the two short infrarede Waves:TM5 (1.55-1.75μm) andTM7(2.08-2.35μm).We can use it to extact the usefull hydrothermal alteration information .The remote researchers have do a lot of experiment more than twenty years,and they confirm the rocky alteration information has great relativity with the metallic ore deposit..The paper comes from wall rock alteration ,which is the direct signal of mineral foundation ,then,makes use of ETM⁺ to extract the remote sensing abnormal information of mineralized alteration in the sands and desert area,and apply some clue for discovering ore.First,this article mainly analyzed the geologic and physic foundation of extracting alterative abnormal information,and sμmmarized the relation between hydrothermal solution wall rock type of alteration ,alterative type ,between alterative type and mineral products.Approved that the alterative rock information and metallic ore deposit has high relativity.Searched the spectrum characters of all kinds of alterative rocks in band of ETM⁺ image .and su- mmarized spectrμm ,which has judging sense, in visible light–near-infrared,is producted by Fe²⁺,Fe³⁺ and OH- H₂O,CO₃^2-.This article bases on the foundation and regional geologe environments ,makes use of ETM⁺ and ERDAS,ENVI,PCI software to apply three models to extract altertive information .The models are enhancing model which is basis on spectrum characters,the thresholding model and the extracting model which is basis on spectrum vectors. Those models have different effect on extracting information ,and the 2th model can not only extract the altertive information but also classify the altertive information .At last, this article do the contrast between this three models.In a word,the paper thought ETM⁺ image has the effect on extracting alterative abnormal information and has the advantages of rapid and economical.It can rapidly realize exploration and confirm metallogenic distant zoo in low work stage area It can has important sense in diacovering big ore and metallogenic district.