遥感找矿信息提取及靶区预测——以青海祁连县红土沟-川刺沟地区为例

Extraction of Remote Sensing Prospecting Information and Target Prediction:A Case Study of Hongtugou-Chuancigou District in Qilian,Qinghai

为了寻找新的找矿靶区,拓展遥感找矿技术的应用潜力,该研究以ETM和GeoEye-1遥感影像为基础,计算了彩色合成的最佳指数并对图像进行滤波处理以增强构造信息、解译线环构造;采用"SAM去干扰异常主分量阈值门限技术"对图像进行铁染、羟基蚀变信息提取;结合多元数据综合分析及成矿预测,圈定了3处靶区。通过实地地质工作,在圈定的第一靶区内发现了矿化较好的蚀变带,验证了通过构造增强、蚀变提取、多元数据综合分析,运用遥感技术找矿方法的准确、有效,为该区找矿工作提供了新的有利依据。

In order to find new mineral prospecting targets and expand the potential application of remote sensing prospecting technology,this investigation calculated the optimum index factor of color composite based on ETM and GeoEye-1 remote sensing image,then it made the filtering process to enhance the tectonic information and interpret the linear and circular geological structure.Furthermore,extraction to the information of iron and hydroxyl alteration using “de-interfered anomalous principal component thresholding technique based on spectral angle mapping(SAM)”.Finally,three favorable target areas were delineated by analyzing the multi-data composite and the metallogenic prediction.Through field geological work,the authors discovered a better mineralized alteration zone in the delineated target area and this verified the effectiveness of the proposed method.This method provides a new advantageous basis for prospecting in study area.