高精度磁测技术在甘肃西成铅锌矿勘探中的应用  

Application of the High-Precision Magnetic Technique to Exploration in the Xicheng Lead-Zinc Deposit,Gansu Province

作　　者：陈靖[1,2] 王万银 李增涛[2] 谈应范 王国栋[3] 

机构地区：[1]长安大学重磁方法技术研究所,长安大学地质工程与测绘学院,长安大学西部矿产资源与地质工程教育部重点实验室,陕西西安710054 [2]西北有色地质勘查局物化探总队,陕西西安710068 [3]甘肃省有色地质勘查局106队,甘肃兰州730046 [4]中国地质大学,北京100083

出　　处：《地质与勘探》2014年第5期976-983,共8页Geology and Exploration

基　　金：中国地质调查局"秦岭成矿带矿产远景调查"项目;中央高校基本科研业务费专项资金(项目编号:2014G3262010);长安大学基础研究支持计划专项基金联合资助

摘　　要：甘肃西成铅锌矿是我国乃至世界上都非常著名的铅锌矿田。近年来,西成矿田迎来了新一轮找矿热潮,陆续在原矿区周边和外延地区有了很多突破。利用高精度磁法测量在西成矿带外延某处获取磁法资料,利用化极磁异常垂向一阶导数和归一化总水平导数垂向导数推断出区内5处地质体边界和4条断裂。根据该区地质和矿产分布特征,推测矿体主要分布于黑云母石英片岩向大理岩的接触或过渡地带,对应中泥盆统安家岔组厂坝层D2a1条带状大理岩。根据地质化极磁异常和该区构造情况,结合化探、地质成果圈定出与成矿有关的4个靶区,该靶区与Pb、Zn化探异常对应,可见若干矿化点。选取靶区内一磁测剖面进行反演,反演结果说明矿体向北西倾斜。经钻孔验证,已在不同深度见矿,证明了靶区的有效性。In recent years,exploration of the Xicheng lead-zinc ore field has been expanded toward surrounding areas,in which the high-precision magnetic survey played a certain role. Using vertical first-order derivates and normalized total horizontal derivates from reduced to the pole(RTP) magnetic anomalies,we delineated five geological boundaries and four faults. Then we inferred that ore bodies are mainly distributed in the contact or transition zones between quartz biotite schist and marble in the light of geological conditions and mineral distribution characteristics,corresponding to middle Devonian Anjiacha Group Changba Bed D2a1. According to the RTP magnetic anomalies and geological structure conditions,four target regions were forecasted combining with geochemical data. These target areas are consistent with Pb-Zn geochemical anomalies,bearing several mineralized spots seen.We chose a magnetic profile in the target regions to implement magnetic data inversion. The results show that the ore body inclines to NW. The borehole drilling verified the existence of ore at different depths,and proved the ore-search potential of the target regions.

关 键 词：高精度磁法 靶区 西成铅锌矿 甘肃 

分 类 号：P631.2[天文地球—地质矿产勘探] P618.4[天文地球—地质学]