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Hydrothermal Alteration Mapping Using ASTER Data in Northern Dong Ujimqin,Inner Mongolia

YANG Chang-bao1,JIANG Qi-gang1,LIU Wan-song1,QIU Dian-ming21.College of GeoExploration Science and Technology,Jilin University,Changchun 130026,China2.Editorial Departmont,Journal of Jilin University,Changchun 130026,China  
The availability of spectral information in the shortwave infrared(SWIR) and thermal infrared(TIR) channels of the advanced spaceborne thermal emission and reflection radiometer(ASTER) is much better than that from Landsat ETM.It allows a detailed spectral characterization of land covers,particularly of those rocks and minerals with diagnostic spectra falling into the wavelength range of SWIR and TIR.The authors present a technical approach based on spectral angle mapper(SAM) for hydrothermal alternation information extraction from ASTER images.The method is applied to northern Dong Ujimqin in Inner Mongolia as a case study.The results shows that the ASTER images,through appropriate band combination and image enhancement,are preferable for retrieval of the follo-wing three kinds of hydrothermal alteration which contains Fe-OH(jarosite,iron dolomite),Al-OH(clay mineral,alunite,chlorite,sericite) and Fe3+(limonite,hematite).Comparatively,ASTER images indicate a greater ability of depictin.
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