青海智益-苦海地区遥感找矿预测

摘要

Zhiyi-Kuhai area in Qinghai province is located in the east Kunlun metallogenic belt.The metallogenic conditions of Zhiyi-Kuhai area is good.In order to solve the problem of shortage of reserve exploration base,based on remote sensing technology and integrated multivariate information,prediction of the prospecting target areas of Zhi-Kuhai area is conducted.Firstly,the ETMand SPOT5 data are taken as the basic images,the alteration information is extracted from the ETMimage by adopting principal com-ponent analysis method,the lithology strata and tectonic information are interpreted based on SPOT5 data;secondary,combing with multivariate information,the comparison and analysis of the above interpreted in-formation of Zhiyi-Kuhai area and Kangdenongshe Au-polymetallic deposit are conducted,the two favora-ble target areas are delineated.Based on the filed exploration working results,the two chemical anomalies are found in one of the above two favorable target areas,the effective of the remote sensing prospecting ap-proach based on tectonic information enhancement,extraction of alteration information and multivariate in-formation is verified preliminary.The above research results can provide the basis for the further prospec-ting work in Zhiyi-Kuhai area in Qinghai province.%青海智益—苦海地区位于东昆仑成矿带，区内成矿条件优越。为解决该区后备找矿勘查基地紧缺的问题，对区内综合多元信息进行了遥感找矿靶区预测。首先选择 ETM、SPOT5数据作为基础影像，采用主成分分析法对 ETM影像进行蚀变信息提取，基于 SPOT5影像对区内岩性地层、构造信息进行了详细解译；然后结合多元数据，与抗得弄舍金多金属矿床进行对比分析，圈定了2处找矿有利靶区。经实地工作，在一靶区内确定了两处化探综合异常，通过构造增强、蚀变信息提取及多元数据综合分析，初步验证了遥感找矿预测思路的有效性，为该区进一步开展找矿工作提供了准确依据。