基于ASTER的康古尔塔格金矿带热液矿化蚀变信息提取  

Extraction of hydrothermal mineralization-alteration information based on the ASTER in Kangguertag gold ore belt

作　　者：吴梦娟[1,2,3] 周可法[1,2] 王金林[1,2] 王珊珊[1,2] 张楠楠[1,2] 周曙光[1,2,3] 

机构地区：[1]中国科学院新疆生态与地理研究所新疆矿产资源研究中心,乌鲁木齐830011 [2]新疆矿产资源与数字地质重点实验室,乌鲁木齐830011 [3]中国科学院大学,北京100080

出　　处：《地质找矿论丛》2016年第4期555-563,共9页Contributions to Geology and Mineral Resources Research

基　　金：国家自然科学基金项目(编号:U1129302);国家973计划(编号:2014CB440803);新疆自治区重大专项(编号:2013301212;201330121-3);西部博士基金项目(编号:XBBS201107;XBBS201203)联合资助

摘　　要：新疆东天山的康格尔塔格金矿带矿产资源丰富,其重要控矿要素之一是韧性剪切带。文章使用ASTER数据提取该地区遥感矿化蚀变信息,并选择康古尔塔格金矿带的部分区域(因受数据获取限制,选择N41°38′—N42°20′、E91°20′—E92°20′范围)作为研究区。研究表明,区内矿化围岩蚀变特征明显,可通过分析研究区岩矿光谱特征以及ASTER数据光谱特征,分别选择假彩色合成、波段比值、特征向量主成分分析法(Crosta Technique)等图像处理技术来识别并提取研究区的矿化与蚀变矿物信息。结合ArcGIS将提取的矿化和蚀变信息与该地区的矿点与构造图层叠加,并对叠加成果图进行分析与对比,从叠加图中发现研究区中的金矿床沿韧性剪切带南侧的韧性剪切过渡带分布。通过阅读该地区的相关地质资料、成果文献等,对提取的矿化和蚀变信息进行验证;结果证明ASTER数据在相似干旱地区进行遥感蚀变信息提取具有可行性,此法用于相似地域找矿具有很好的应用前景。Kangguertag gold ore belt is abundant with mineral resources. Ductlie shear zone is one of the ore-control factors. In this paper ASTER is used to extract remote sensing mineralization-alteration information and areas of N41°38＇-N42°20＇、E91°20＇-E92°20＇ in Kangguertag region are picked up to be study area. Analysis of the rock and ore spectral features, and spectral characteristics of ASTER data shows that false color composite, band ratio, principal component analysis, eigenvector （Crosta Technique） etc., image processing techniques were proper to identify mineralization-alteration and extract the information about the study area. Together with ArcGIS data the extracted mineralization-alteration information overprint the ore occurrence and tectonic layers of the study area and the layer overprint shows that the gold deposits （occurrences） are distributed along a transition zone on the southern side of the ductile shear zone. Referring to data and results of the study area the extracted information are coincided with the known deposit and occurrence thus ASTER data are feasible to make mineralization-alteration information extraction in the similar arid area.

关 键 词：康古尔塔格金矿带 ASTER 遥感图像处理技术 蚀变信息提取 东天山 新疆 

分 类 号：P627[天文地球—地质矿产勘探] P618.51[天文地球—地质学]