大功率激电测深方法在豫西董家埝银矿床勘查中的应用  

Application of high-power IP sounding on silver deposit in Dongjianian,western Henan Province

作　　者：张爱玲[1] 孙进[1] 李水平[1] ZHANG Ailing;SUN Jin;LI Shuiping(No.2 Institute of Geological&Mineral Resources Survey of Henan,Zhengzhou 450001,Henan,China)

机构地区：[1]河南省地质矿产勘查开发局第二地质矿产调查院,河南郑州450001

出　　处：《矿产勘查》2021年第3期650-654,共5页Mineral Exploration

基　　金：河南省两权价款项目(编号:2015-17)资助。

摘　　要：豫西董家埝银矿属于构造蚀变岩型银矿床,银矿体赋存于F1构造蚀变带中;为了解F1构造蚀变带在深部延伸情况和矿(化)体特征,依据岩(矿)石物理性质、矿床地质特征,采用大功率激电测深方法,激电测深断面反映了地下半空间内深部构造蚀变带和银矿(化)体引起的"中高阻、弱极化"异常特征,后经钻探工程验证,在F1构造蚀变带深部发现了品位较均匀、厚度较稳定的银矿体,银矿体Ag平均品位164.0×10^(-6),平均总厚度7.06 m,预期可提交(333)+(334)?银资源量1200 t。该矿床是豫西中元古界小河岩体南缘首次发现的银矿床,它的发现为矿区周边或类似成矿条件地区寻找银矿床提供了范例。The Dongjianian silver deposit in western Henan belongs to the structural altered rock type silver deposit,and the silver ore body is hosted in the F1 structural altered zone. In order to comprehend F1 structural altered zone with deep extension situation and characteristics of ore( mineralization),on the basis of rock( ore) physical properties and deposit geological characteristics,input the high power induced polarization( IP) sounding method. The IP sounding profile reflects the abnormal characteristic of "mid-high resistance,weak polarization"caused by the deep structural altered zone and in underground half-space silver( mineralization). Then it has been verified by drilling engineering,the silver body with uniform grade and stable thickness is found in deep F1 structural altered zone,which the average grade of silver body is 164.0×10^(-6),the average total thickness is 7.06 m. The deposit is the first deposit discovered on the south edge of mesoproterozoic Xiaohe rock mass silver in the western Henan. Its discovery provides an example for the searching for silver deposits in the vicinity of mining areas or areas with similar metallogenic conditions.

关 键 词：银矿 大功率激电测深 构造蚀变带 小河岩体 豫西 

分 类 号：P631.3[天文地球—地质矿产勘探]