岩性与构造控矿特征遥感信息提取与分析——以东天山铜矿区为例

Remote Sensing Information Extraction and Analysis of Lithology and Structural Ore-controlling Characteristics:A Case Study ofEastern Tianshan Copper Mining Area

利用卫星数据快速提取矿化岩性信息,是目前矿产资源勘查的重要技术手段之一。文章以新疆东天山土屋斑岩型铜矿区为研究区,基于该地区出露岩体相关矿物的可见光近红外波段(VNIR)至短波红外波段(SWIR)的光谱特征分析,对ASTER多光谱包括以热红外(TIR)波段在内的全谱域数据进行处理,分别采用主成分分析(PCA)、波段比值(BR)、矿物指数算法识别和提取了研究区地表侵入体的岩性信息。同时,对ASTER 15 m DEM数据进行E-W方向滤波处理,提取和解译出土屋矿区控矿断裂构造信息,结合岩性信息分析控矿条件。最后,对遥感信息提取结果分别进行了矿物镜下与野外验证。

Using satellite data to quickly extract mineralized lithology information is one of the important technical means for mineral resources exploration.In this paper,the Tuwu porphyry copper mine in the eastern Tianshan Mountains of Xinjiang is taken as the research area.Based on the spectral characteristics of the visible near-infrared band(VNIR)to the short-wave infrared band(SWIR)of the exposed rock-related minerals in this area,the ASTER multi-spectral data including the thermal infrared(TIR)band are processed.Principal Component Analysis(PCA),Band Ratio(BR),and Mineral Index Algorithms are used to identify and extract the lithology information of surface intrusions in the study area.At the same time,the data of ASTER 15 m DEM are processed by E-W direction filtering,and the ore-controlling fault structure information of Tuwu mining area is extracted and interpreted.Finally,the results of remote sensing information extraction are verified by mineral microscope and field.