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Remote Sens. 2015, 7(10), 13878-13894; doi:10.3390/rs71013878

Integration of Concentration-Area Fractal Modeling and Spectral Angle Mapper for Ferric Iron Alteration Mapping and Uranium Exploration in the Xiemisitan Area, NW China

1
National Key Laboratory of Science and Technology on Remote Sensing Information and Image Analysis, Beijing Research Institute of Uranium Geology, Beijing 100029, China
2
Chengdu Center of Hydrogeology and Engineering Geology, Chengdu 610081, China
*
Author to whom correspondence should be addressed.
Academic Editors: James Jin-King Liu, Yu-Chang Chan, Ioannis Gitas and Prasad S. Thenkabail
Received: 3 July 2015 / Revised: 4 October 2015 / Accepted: 7 October 2015 / Published: 22 October 2015
(This article belongs to the Special Issue Remote Sensing in Geology)
View Full-Text   |   Download PDF [2252 KB, uploaded 22 October 2015]   |  

Abstract

The high-grade uranium deposits in the Xiemisitan area, northwestern China, are genetically associated with the faulting of felsic volcanic or sub-volcanic rocks. Ferric iron alteration indicates that oxidizing hydrothermal fluids percolated through the rocks. In this study, we measured the gamma-ray intensities of rocks in the Xiemisitan area and we propose a hybrid method for the mapping of ferric iron alteration using concentration-area fractal modeling and spectral angle mapper. The method enables ferric iron alteration to be distinguished from potash-feldspar granitic rocks. The mapping results were integrated with structural data to assist with exploration for uranium in the study area. Using this approach, six prospective areas of mineralization were proposed. Of these areas, two anomalies with high gamma-ray intensities of 104 and 650 Uγ were identified and verified by field inspection. These observations suggest that Enhanced Thematic Mapper Plus images are a valuable tool that can improve the efficiency of uranium exploration. View Full-Text
Keywords: enhanced thematic mapper plus; concentration-area fractal modeling; spectral angle mapper; uranium exploration; Xiemisitan area; Northwest China enhanced thematic mapper plus; concentration-area fractal modeling; spectral angle mapper; uranium exploration; Xiemisitan area; Northwest China
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Qiu, J.-T.; Zhang, C.; Hu, X. Integration of Concentration-Area Fractal Modeling and Spectral Angle Mapper for Ferric Iron Alteration Mapping and Uranium Exploration in the Xiemisitan Area, NW China. Remote Sens. 2015, 7, 13878-13894.

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