| 利用TM数据在多种环境因素干扰条件下填制蚀变岩方法 |
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| 引用本文： | 马建文,张齐道.利用TM数据在多种环境因素干扰条件下填制蚀变岩方法[J].地质找矿论丛,1994,9(2):84-88. |
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| 作者姓名： | 马建文 张齐道 |
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| 作者单位： | 冶金部天津地质研究院 |
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| 基金项目： | 国家人事部留学归国人员基金 |
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| 摘 要： |
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| 关 键 词： | TM数据 热液蚀变岩 环境因素 找矿 |
THE METHOD OF MAPPING HYDROTHERMALLY ALTERED ROCKS UNDER VARIOUS ENVIRONMENTAL CONDITIONS USING TM DATA |
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| Ma Jianwen and Zhang Qidao.THE METHOD OF MAPPING HYDROTHERMALLY ALTERED ROCKS UNDER VARIOUS ENVIRONMENTAL CONDITIONS USING TM DATA[J].Contributions to Geology and Mineral Resources Research,1994,9(2):84-88. |
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| Authors: | Ma Jianwen and Zhang Qidao |
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| Institution: | Tian jin Geological Academy;Tian jin Geological Academy |
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| Abstract: | Landsat 5 TM data, provides seven spectrum bands 30×30 spatial resolution information and good market price, is widely used in geological exploration and mapping. The spectrum characteristics of mineral assemblages in hydrothermally altered rocks depend on mainly the temperature, pressure chemical fluids and composition of host rocks. Altered rocks are geneticaly related to ore so that mapping hydrothermally altered rock spectrum using TM spectrum bands is an indirect approach to predict ore body. Rowan (1982), Abrams(1989)successfully identified alteration using TM 5/7 and 3/1 spectrum bands in rock exposed area. Loughlin(1991), Zhao Yanhong(1991), Xu Ruisong(1991) have confirmed that altered rocks can be distinguished by combination of 4/3, 5/7+PCA in dense forest areas.However, these methods are not effective in various environmental impact areas, The method designed for two project have got more effective results. The method consists of three steps(1) TM image masking,(2)PCA, (3)result components scatter map masking, the process is directed by characteristics of rock spectrum and by TM band loading values of PCA. |
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