西藏尼雄铜铁多金属成矿带遥感找矿模式与找矿方向

西藏尼雄铜铁多金属成矿带作为冈底斯铜铁多金属成矿带的重要组成部分显示出良好的找矿前景,但该区生态环境恶劣、地质条件复杂,给常规地质找矿工作带来巨大难度。应用矿产资源潜力评价推广的遥感"线、环、色、带、块"五要素找矿理论及去干扰异常主分量门限化技术在ETM+数据的基础上进行遥感地质解译和信息提取,以区域成矿规律和典型矿床研究为基础,论述了适合该矿带的遥感找矿模式。结合数理统计和地质异常理论对获取的综合找矿信息进行合理量化,最后利用GIS技术对地质、物探、化探、遥感多元找矿信息进行空间分析以确定找矿远景区,并指出主要矿种的找矿方向。研究结果表明,以遥感技术为切入点,结合基础地质、物探、化探资料进行地质找矿的模式具有高效、准确的优点。

Remote Sensing Prospecting Model and Orientation of Cu-Fe-Polymetallic Metallogenic Belt in Nixiong, Tibet

The Cu-Fe-polymetallic metallogenic belt in Nixiong of Tibet,which is an important part of Gangdise Cu-Fe-polymetallic metallogenic belt,dispalys a good prospecting future,but the bad ecological environment makes great trouble for conventional geological prospecting in this area.Based on the metallogenic regularity of typical deposits,this paper applied five features of remote sensing technique method for mineral-prospecting and deinterfered anomalous principal component thresholding technique to obtain geological information by ETM+ data,and discussed remote sensing prospecting models suitable for Nixiong metallogenic belt.Through the theory of mathematical statistics,theory of geological anomaly and GIS technique,this study quantitativly analyzed the data from geophysical,remote sensing and delineated prospecting areas.The results reveal that it is efficient and accurate for minieral-prospecting by means of remote sensing combined with basic geological,geophysical and geochemical information,and the method of multi-features remote sensing minieral-prospecting is reliability.