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Extraction of hydrothermal alteration mineral groups of porphyry copper deposits using Landsat8 OLI data |
Ziyi WANG1, Tingbin ZHANG1,2,3( ), Guihua YI1, Kanghui ZHONG1, Xiaojuan BIE1, Jibin WANG1, Jiaojiao SUN1 |
1. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China 2. College of Engineering and Technical, Chengdu University of Technology, Leshan 614000, China 3. Key Laboratory of Geoscience Spatial Information Technology, Ministry of Nature Resources, Chengdu 610059, China |
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Abstract The enhancing of NIR band and SWIR2 band of OLI data makes the spectra become the diagnostic spectra of ferric iron minerals, Al-OH and Mg-OH alteration minerals. The authors used the mixture tuned matched filtering (MTMF) mapping method to extract ferric iron, Al-OH and Mg-OH alteration minerals in Tiegelong prospective block of the Duolong porphyry Cu-Au ore concentration area. Compared with the results of mineral mapping from Hyperion data, the three mineral mapping types extracted from Landsat8 OLI are reliable. At the same time, the spatial distribution pattern of alteration minerals agrees with the hydrothermal alteration zone of typical porphyry copper deposits. The remote sensing alteration zones from interior to exterior of the Tiegelong porphyry Cu ore block are phyllic+argillic zone (Al-OH minerals) and propylitic zone (Mg-OH minerals), and the ferric iron minerals are between the arephyllic+argillic and propylitic zones.
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Keywords
OLI
porphyry copper deposit
hydrothermal alteration mineral zones
MTMF
remote sensing
Tiegelong
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Corresponding Authors:
Tingbin ZHANG
E-mail: zhangtb@cdut.edu.cn
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Issue Date: 10 September 2018
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