物探方法CSAMT在桂北某金矿区深边部找矿预测应用  

Application of geophysical method CSAMT in deep edge prospecting and prediction for one gold deposit in North Guangxi

作　　者：蒋卉 黄理善 卢见昆 赵毅 王邦民 JIANG Hui;HUANG Lishan;LU Jiankun;ZHAO Yi;WANG Bangmin(China Nonferrous Metals(Guilin)and Mining Co.,Ltd.,Guilin 541004,Guangxi,China)

机构地区：[1]中国有色桂林矿产地质研究院有限公司,广西桂林541004

出　　处：《矿产与地质》2023年第5期1057-1062,共6页Mineral Resources and Geology

基　　金：中国有色集团有限公司科技计划项目“中非铜钴成矿带典型矿床钴成矿富集规律与成因类型”(编号:2022KJJH01);“金属矿山强干扰条件下有效探测及异常识别新技术研究与示范”(编号:2021KJJH08);研发平台“有色金属矿产勘查工程技术研究中心条件建设”(编号:2021YFPT04)项目共同资助。

摘　　要：桂北某金矿为少硫化物构造破碎带蚀变岩型矿床,赋存于含砾杂砂岩层,受NNE向断裂构造带控制,与金矿化有关的围岩蚀变类型主要为硅化、黄铁矿化、毒砂化。基于对金矿区内断层的含矿性及断层与成矿关系的研究结果,选择可控源音频大地电磁测深法(CSAMT)为主要的物探勘查技术,力求在矿区深边部取得金矿找矿突破。CSAMT方法探测结果表明,其电阻率异常基本能够准确地反映断裂构造的位置及向深部延伸的展布特征,推测断裂构造带可延深至高程500 m以下,在深部及走向方向上大大拓展了金矿找矿空间。在桂北地区某金矿区经一系列钻孔验证,发现了工业矿体。从而说明物探CSAMT方法在桂北金矿勘查效果良好,值得进一步推广应用。A certain gold deposit in North Guangxi is the structural fracture zone altered rock type deposit with less sulfide,wuich is hosted in gravel-mixed sandstone layer and controlled by NNE striking fault structural zone.The main types of wall rock alteration related to gold mineralization are silicification,pyritization,and arsenopyritization.Based on the research result on the ore-bearing properties of fault structure in the gold mining area and the relationship between fault structure and gold mineralization,the controllable source audio magnetotelluric sounding(CSAMT)method is chosen as the main geophysical exploration technology,aiming to achieve a breakthrough of gold exploration in the deep and periphery of the mining area.The detection result of CSAMT method indicates that its resistivity anomaly can accurately reflect the location of fault structures and the distribution characteristics of deep extension.It is speculated that the fault structural zone can extend to an elevation below 500 meters,greatly expanding the gold exploration space in both deep and strike direction.An industrial ore body has been discovered through a series of drilling holes and engineering verification at the gold mining area in North Guangxi.This indicates that the geophysical exploration method CSAMT has a good effect on the exploration of gold deposit in North Guangxi and it is worth promoting and applying in the future.

关 键 词：桂北金矿 CSAMT 矿区深边部 找矿预测 

分 类 号：P631.3[天文地球—地质矿产勘探] P618.51[天文地球—地质学]