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《Geoscience》 2007-04
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Study on Abnormal Extracting of Altered Rocks Using ETM~+ Data in Zhulazhaga Gold Deposit,Alashan Region,Inner Mongolia

CONG Li-juan1,2,HU Feng-xiang2,YANG Jun-cai3,SU Xin-xu2,ZHANG Li-li2,GAO Xiu-hua4(1.School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China;2.Inner Mongolia Geological Survey Institute,Huhhot,Inner Mongolia 010020,China;3.Shanxi Geological Survey Institute,Yuci,Shanxi 030600,China;4.Inner Mongolia Institute of Land Resources Exploration and Development,Huhhot,Inner Mongolia 010020,China)  
Most part of northwestern China belongs to arid/semi-arid.The natural conditions are very hard.Exploring mineral resources are very difficulty using traditional geology,geophysical and geochemical methods.Now it is very urgent for geologist to explore mineral resources using new technique such as remote sensing in this area.We chose Zhulazaga gold deposit as a testing district,and studied on abnormal data extracting of altered rocks using Enhanced Thematic Mapper plus(ETM+)images.The study began from the characteristics of minerals wave spectrum,and made some corrections to Crosta.The principal component analysis(PCA) method has been used on selected 4 bands.A new model of abnormal extracting on altered rocks using ETM+ images created.Alterations with iron oxide have been enhanced by using Band 2,Band 3,Band 4,Band 5/Band 1 of ETM+ data;Band 2,Band 4,Band 5,and Band 7 will be key analysis data for abnormal extracting for argillic and carbonation alteration.Extracting abnormal data of altered rocks in the deposit and beyond areas show that there are iron,argillic and carbonation alteration.Geology and geochemical analysis showed a good correlation with hydrothermal alteration information extracted from ETM+.This study provides a new method for prospecting in the arid/semi-arid area by remote sensing techniques in the deposit and beyond areas.This paper made some contributions for ore-prospecting in the arid/semi-arid area by remote sensing techniques.
【Fund】: 中国地质调查局“内蒙古自治区1∶25万补力太幅、四子王幅区域地质调查”项目(1212010510506)
【CateGory Index】: P575
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