| As the contradiction between supply and demand of mineral resources intensifying,resource has become the central problem of the economic development. So,Using advanced technology,accurately and effectively making metallogenic prediction of mineral resource exploration is the urgent problems.In recent years,the rapid development of aviation remote sensing technology will improve metallogenic prediction to the new stage.ASTER data have bigger superiority than the TM and ETM+data in spatial resolution and spectral resolution.There are some things that ETM+data will not be able to compare to,Especially extracting clay alteration information from ASTER image.The alteration of country rock is a very normal and regular phenomenon occurs during ore forming.It's very important information of mineralization.Many kinds of alteration is very extensive and intensive in areas.The alteration of country rock related to mineralization includes pyritization,silicification,sericitization, chloritization,epidotization,carbonatization.This paper focus on this information, objective to complete extracting alteration information in ShanHou area of JinHua with ASTER data by using Principal component analysis,Ration enhancement method,Spatial filtering.The Principal component analysis is the key technology. This paper show that band1,2,3,4 is the PC combination for extracting Fe3+ alteration information.The PC combination of band 1,3,4,6 can extractAl-OH alteration information to some extent.The PC combination of band 1,3,4,6 can extract Mg-OH,CO32- alteration information to some extent.The Ratio analysis also playing a big role in alteration information extraction,such as band4/band3 can enhance silicated alternation information;band3/band2 can enhance vegetation information.In combination with such data as geology,mineral resources and remote sensing data,prospecting criteria are proposed in this paper,six ore-forming prospect areas are tentatively delineated.
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