CSAMT勘查对铜多金属矿控矿地质因素的分析

Analysis of Geological Factors Controlling Copper Polymetallic Ore by CSAMT Exploration

后山里铜多金属矿经过多年的地质勘查研究,对矿体的地质特征、控矿因素有了一定的认识,普遍认为主要是断裂带控矿,但矿区内断裂带极为发育且错综复杂,对控矿的主要断裂带的认识还不清晰。为进一步查明区内的控矿断裂带的空间展布特征,利用可控源音频大地电磁法(CSAMT)以及地表的地质调查,基本查明了控矿地质构造在深部的空间展布特征,同时对矿体在深部的形态特征进行了圈定。结果表明,在控矿的诸因素中NWW向断裂构造是最主要的主导因素,而岩性及其他控矿因素在形成构造的前提下才能起到相应的控制作用。在NWW向断裂构造的高极化率异常与低电阻率异常结合部位为矿体赋存富集的有利地段。

After years of geological exploration and research in the Houshan copper polymetallic mine,we have a certain understanding of the geological characteristics and ore-controlling factors of the orebody.It is generally believed that the main ore-controlling zone is fault zone,but the fault zone in the mine is extremely developed and complicated,and the understanding of the main orecontrolling fault zone is not clear.In order to further identify the spatial distribution characteristics of ore-controlling fault zones in the area,the controlled source audio magnetotelluria(CSAMT)method and surface geological survey are used to basically identify the spatial distribution characteristics of ore-controlling geological structures in the deep,and at the same time,the morphological characteristics of ore bodies in the deep are delineated.The result show that the NWW-trending fault structure is the most dominant factor in the ore-controlling factors,and the lithology and other orecontrolling factors can play the corresponding controlling role in the premise of the formation of the structure.The combination of high polarizability anomaly and low resistivity anomaly in the NWW trending fault structure is a favorable area for the occurrence and enrichment of ore bodies.