广西龙胜里市地区多源遥感数据地质构造信息提取研究

摘要

龙胜里市地区位于华南板块二级构造单元扬子陆块南缘与华南褶皱带的交接部位,地质条件复杂,构造变形强烈,形成以紧密的线性褶皱和推覆构造为主要背景的构造环境,具有良好的成矿地质条件,是目前广西地质找矿的热点地区.但由于该地区处于广西北部与湖南接壤的高山区,山势陡峻,植被茂盛,且覆盖面积广,以往地质工作程度较低,采用传统地质勘查方法在该区找矿难度很大,而且成本高、效果不明显.通过对不同的空间分辨率的多源卫星遥感影像ETM+、SPOT 4、SPOT-5数据进行图像处理,并进行线性构造解译,提取线性构造信息,为该地区开展找矿预测提供重要依据.%Lishi area of Longsheng is located at the junction between south rim of Yangtze block of the subtectonic unit in South China Plate and South China fold belt.In this area with complicated geologic conditions and strong structural deformation,tight linear folds and nappe structures form the structural environment of main settings.With the favorable metallogenic conditions,the area become a hot-spot area of geological prospecting in Guangxi.But because the area is located in northern Guangxi and the high mountainous area near Hunan Province,the steep mountains,extensive and lush vegetation and inadequate geological works make it difficult for applying traditional geological exploration in this area while the cost will be high and the effect will be poor.Through processing images with different spatial resolution provided by multi-source satellite remote sensing imagery like ETM+,SPOT-4 and SPOT-5,and with the help of linear tectonic interpretation,the authors extracted the linear structure information and provided important basis for prospecting prediction in this area.