高精度重磁测量在覆盖区找矿中的应用——以无为县蔚山铁铜矿预查为例  

The application of high precision gravity and magnetic survey to prospecting in coverage area:A case study of the reconnaissance of Weishan iron and copper deposit in Wuwei County

作　　者：赵敏 盛勇[1] 戚良刚 ZHAO Min;SHENG Yong;QI Liang-Gang(Anhui Institute of Geophysical and Geochemical Prospecting Techniques,Hefei 230022,China)

机构地区：[1]安徽省地球物理地球化学勘查技术院，安徽合肥230022

出　　处：《物探与化探》2019年第6期1211-1216,共6页Geophysical and Geochemical Exploration

基　　金：安徽省地勘基金“安徽省无为县蔚山地区铁铜矿预查”项目(2011-2-9)

摘　　要：在覆盖区,常规的地质工作开展难度较大,而高精度重力、磁法测量方法能有效地进行隐伏断裂划分和岩体圈定,为覆盖区找矿提供重要帮助。笔者以安徽省无为县蔚山铁铜矿预查为例,通过对重磁异常的处理和分析,对预查区的断裂和岩体进行了划分和圈定;同时结合地质特征筛选了两处找矿潜力较大的重磁局部异常,经钻孔验证,在孔深260~50 m段累计见视厚度近40 m,TFe品位52%、mFe品位38%的富铁矿体。勘查成果对预查区所在的庐枞火山岩盆地东缘覆盖区的找矿工作具有一定的指导意义。In the coverage area,it is very difficult to carry out the conventional geological work,whereas the high?precision gravity and magnetic survey methods can quickly and effectively divide the buried faults and determine the rock boundary,which provides important assistance for prospecting in the coverage area.With the Weishan iron?copper deposit reconnaissance in Wuwei County of Anhui Prov?ince as an example,the authors divided the faults and determined rock boundary in the pre?investigation area through the processing and analysis of gravity and magnetic anomalies.Combined with geological features,two gravity and magnetic anomalies with large poten?tial for prospecting were screened where a 40 m rich iron orebody with a TFe grade of about 52%and a mFe grade of about 38%was found by drilling.Therefore,the effectiveness of the method is confirmed,and this result also has certain guiding significance for the prospecting work in the eastern marginal coverage area of the Luzong volcanic basin where the investigation area is located.

关 键 词：覆盖区找矿 高精度重磁测量 2.5D重磁反演 庐枞火山岩盆地 

分 类 号：P631[天文地球—地质矿产勘探]