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Extraction of Mineral Alteration Zone from ETM+ Data in Northwestern Yunnan,China |
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| Authors: | Zhao Zhifang Zhang Yujun Cheng Qiuming Chen Jianping |
| Institution: | 1. Beijing Key Laboratory of Research and Exploration Information of Land Resources, China University of Geosciences, Beijing 100083, China; Department of Earth and Space Science and Engineering, York University,Toronto ON M3J1P3, Canada; Yunnan Institute of Geology Survey, Kunming 650051, China 2. China Aero Geophysical Survey and Remote Sensing Center for Land and Resources, Beijing 100083, China 3. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences,Wuhan 430074, China; Department of Earth and Space Science and Engineering, York University,Toronto ON M3J1P3, Canada 4. Beijing Key Laboratory of Research and Exploration Information of Land Resources, China University of Geosciences, Beijing 100083, China |
| Abstract: | Alteration is regarded as significant information for mineral exploration. In this study, ETM remote sensing data are used for recognizing and extracting alteration zones in northwestern Yunnan (云南), China. The principal component analysis (PCA) of ETM bands 1, 4, 5, and 7 was employed for OH- alteration extractions. The PCA of ETM bands 1, 3, 4, and 5 was used for extracting Fe2 (Fe3 ) alterations. Interfering factors, such as vegetation, snow, and shadows, were masked. Alteration components were defined in the principal components (PCs) by the contributions of their diagnostic spectral bands. The zones of alteration identified from remote sensing were analyzed in detail along with geological surveys and field verification. The results show that the OH" alteration is a main indicator of K-feldspar, phyllic, and prophilized alterations. These alterations are closely related to porphyry copper deposits. The Fe2 (Fe3 ) alteration indicates pyritization, which is mainly related to hydrothermal or skarn type polymetallic deposits. |
| Keywords: | mineral alteration extraction from ETM data PCA OH- alteration Fe2 (Fe3 ) alteration northwestern Yunnan China |
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