高精度磁测在青海都兰县希望沟铜矿找矿中的应用

An Application of High-precision Magnetic Survey in Prospecting of Xiwanggou Copper Deposit,Dulan County,Qinghai Province

选取青海都兰县希望沟一带铜矿找矿靶区为研究对象,通过1∶10000高精度磁法面积测量以及大比例尺的磁法剖面测量,结合研究区的地质背景、地球化学特征、地表地下工程验证等资料,解译了该地区的隐伏断裂带,并且大比例尺磁法的找矿标志有二:磁法正异常幅值达到329 nT以上并与激电异常幅值达到2.5%以上的地段是成矿的有利部位,与超基性岩套合较好的地段为深部成矿的有利区段;磁法异常具有锯齿状特别是跳跃的部位,并且结合激电异常幅值在2.0%以上的地段与地表黄铁矿化硅化构造角砾岩套合较好的地段是成矿的有利区段。

The application of surface high-precision magnetic survey in geological prospecting is always the direction of the geologists,especially in the early stage of prospecting.In this paper,the prospecting target area of Xiwanggou copper deposit in Dulan County is selected as the research object.We applied to the rate of 1∶10,000 high-precision magnetic survey and large-scale magnetic survey based on the geological background,including the geochemistry features and the verification of surface and underground engineering.The hidden fault zone in the study area has been interpreted.The area,where the amplitude of positive anomaly of magnetic method is over 329 nt and the amplitude of induced polarization anomaly is over 2.5%,is the favorable area for mineralization.The area,where the amplitude of positive anomaly of magnetic method is well integrated with ultrabasic suite,is the favorable area for deep mineralization.The magnetic method anomaly has serrated position,especially jump position.It is combined with the IP anomaly with the amplitude of more than 2.0%.The pyrite silicified structure Breccia is the favorable area for mineralization.