多源数据在甘肃山羊坝地区找矿勘查中的应用

Mineral Resources Prospecting by Synthetic Application of Multi-Source Data in the Shanyangba Area,Gansu,China

针对单一遥感数据已难以满足地质找矿工作需求的问题,本次研究综合使用雷达数据、光学数据及其他非遥感数据共同服务于地质找矿。以甘肃山羊坝地区为研究区,选择ASTER多光谱遥感数据,采用植被抑制法+特征向量主成分分析法,提取研究区的蚀变信息;选择PALSAR雷达数据,采用聚焦、多视、滤波、辐射定标、地理编码和增强处理等一系列处理方法制作雷达强度图,提取研究区构造信息。最后利用GIS平台进行遥感、地质及化探等信息的集成与综合分析,最终圈定了具有找矿前景的矿产资源靶区,野外查证发现一处金矿点。此次研究获得了良好的找矿效果,表明同时使用雷达数据、光学数据及其他非遥感数据的综合找矿方法,对本地区金矿找矿勘查具有重要的指导作用。

In view of the problem that single remote sensing data can t meet the demand of geological prospecting,this study combines radar data,optical data and other non-remote sensing data to serve geological prospecting in the Shanyangba area,Gansu.Firstly,we utilize ASTER multispectral remote sensing data with vegetation suppression method and feature vector principal component analysis to extract alteration information in the study area.Then,PALSAR radar data is applied to extract tectonic information and produce radar intensity maps from a series of processing methods including focusing,multi-viewing,filtering,radiometric calibration,geo-coding and enhancement processing.Finally,remote sensing,geological and geochemical information are integrated in the GIS platform and help to delineate the prospecting target area of exploration,which is consis-tent with a gold ore spot found in field work.The prospecting results show that the comprehensive prospecting method using radar data,optical data and other non-remote sensing data are effective and can be important guidance for gold prospecting in this area.