甚低频电磁法在隐伏金属矿床定位预测中的应用--以大兴安岭西南段铜多金属矿点为例  

Application of Very Low Frequency Electromagnetic Method to Positioning of Concealed Metal Deposits:An Example of Copper Polymetallic Ore Occurrences in the Southwest Greater Hinggan Mountains

作　　者：陈伟军[1] 郝情情 褚少雄[2] 刘建明[2] 刘红涛[2] 蒋鑫[3] 

机构地区：[1]中国冶金地质总局矿产资源研究院,北京101300 [2]中国科学院地质与地球物理研究所,北京100029 [3]中国地质大学(北京)地球科学与资源学院,北京100083

出　　处：《地质与勘探》2017年第3期528-532,共5页Geology and Exploration

摘　　要：甚低频电磁法是一种基于电磁原理的地球物理手段,该方法对寻找受断裂构造控制的脉状矿床效果显著。在矿床勘查中,一般利用目标矿区(及外围)地质体对电磁波作用反映的物性特征进行扫面工作,用以快速发现覆盖层之下的矿化构造系统。本文通过对大兴安岭西南段某铜多金属矿点的实际应用,发现矿区内存在明显的甚低频异常,该异常为矿致异常,展示了良好的成矿前景。实践表明,在具备甚低频电磁法应用的地质、地球物理条件的前提下,通过对观测数据进行技术处理,并结合矿区针对性的地质研究,能够有效地揭示覆盖区断裂构造体系的产状及空间展布规律,达到对隐伏-半隐伏金属矿床快速评价的目的。The very low frequency electromagnetic （VLF -EM） technique, which belongs to a geophysical method based on electromagnetic princi- ple, is very effectively to find out vein - type ore bodies controlled by faults. In the exploration of ore deposits, it is generally employed to screen the work surface to reveal geophysical properties reflected by electromagnetic waves in the target area （and periphery）, so that to quickly find and determine miner- alization structure systems below the cover. This method was applied to a copper muhi - metal mineral occurrence in the southwest segment of the Greater Hingan Mountains. The results of VLF - EM measurement show that there are two clear VLF - EM anomalies inside the study area, which implies that this mineral occurrence has a good metal]ogenic prospect. By means of exploration data processing, combined with pertinence geology study, it is confirmed that the VLF - EM method can disclose the occurrence of anomaly bodies and determine the place and distribution of ore bodies in the regions with appro- priate geology and geophysics conditions. The VLF - EM method is an effective technique for the exploration of hidden and semi - hidden mineral deposits.

关 键 词：甚低频电磁法 隐伏矿床 成矿预测 地球物理勘探 大兴安岭 

分 类 号：P631.2[天文地球—地质矿产勘探]