综合地球物理探测在金矿预测中的应用--以胶东郑家金矿为例  

Application of integrated geophysical methods in gold deposit prediction:A case study of Zhengjia gold deposit in Jiaodong area

作　　者：宋立伟 王会军 王铁强 李文宇 SONG Liwei;WANG Huijun;WANG Tieqiang;LI Wenyu(Key Laboratory of Geological Safety of Coastal Urban Underground Space,Ministry of Natural Resources,Shandong Qingdao 266100,China;Qingdao Geo-Engineering Surveying Institute(Qingdao Geological Exploration Development Bureau),Shandong Qingdao 266100,China;School of Resource and Earth Science,China University of Mining&Technology,Jiangsu Xuzhou 221116,China)

机构地区：[1]自然资源部滨海城市地下空间地质安全重点实验室,山东青岛266100 [2]青岛地质工程勘察院(青岛地质勘查开发局),山东青岛266100 [3]中国矿业大学资源与地球科学学院,江苏徐州221116

出　　处：《中国地质调查》2024年第2期43-50,共8页Geological Survey of China

基　　金：国家自然科学基金“圆锥型场源矿井瞬变电磁法理论基础研究(编号:41974086)”项目资助。

摘　　要：山东省胶东地区金矿资源丰富,成矿潜力巨大,但主要控矿构造焦家断裂向南延伸区域的地质露头较差,且深部断裂延伸情况不明,制约了该区下一步金矿找矿进展。在山东省莱州市郑家地区采用高精度磁法勘探、纵向中间梯度激电剖面法和激电测深法开展了联合探测应用研究,建立了三维地球物理模型,结合钻孔和地质资料进行了异常区综合解译和成矿预测。初步厘定了深部电性结构为NE走向、略向东倾伏的焦家断裂南段,查明了中浅部构造破碎带和断裂产状变化部位是成矿有利位置。因金矿物主要赋存于黄铁矿、黄铜矿和石英中,故地球物理找矿方向为高视极化率异常的构造破碎带。研究结果验证了综合地球物理探测在金矿预测中具有可实施性,同时为类似地质条件下找矿手段的选择提供参考。Jiaodong area of Shandong Province is rich in gold resources and has great ore-forming potential.However,the geological outcrop condition is poor in the southward extension area of Jiaojia fault,which is the main ore-controlling structure,and the deep fault extension is unknown,seriously restricting the progress of ore prospecting.A joint exploration and application study was carried out using high-precision magnetic prospecting,longitudinal intermediate gradient IP profiling and IP sounding in Zhengjia area of Laizhou City in Shandong Province.A three-dimensional geophysical model was established,and a comprehensive interpretation of anomaly areas and metallogenic prediction were carried out,combined with borehole and geological data.The deep electrical structure of the southern section of Jiaojia fault was preliminarily determined to be NE trend,with a slight dip to the east,and the favorable locations for mineralization were middle-shallow tectonic fracture zone and the change site of the fault occurrence.Because gold minerals mainly occur in pyrite,chalcopyrite and quartz,the geophysical prospecting direction should be a tectonic fracture zone with high apparent polarizability anomaly.The feasibility of integrated geophysical prospecting in gold deposit prediction was verified in this paper,and it also could provide some references for the selection of prospecting means under similar geological conditions.

关 键 词：磁法勘探 激发极化法 三维地球物理模型 成矿预测 视电阻率 

分 类 号：P361.3[天文地球—地球物理学]