胶东招平断裂南段山后金矿区深部地球物理特征及找矿效果  

Geophysical characteristics and prospecting effect deep in Shanhou Gold District, south part of Zhaoping Fault, Jiaodong Peninsula

作　　者：牛兴国 许志河 孙丰月[4] 顾观文 Niu Xingguo;Xu Zhihe;Sun Fengyue;Gu Guanwen(Geophysical Prospecting Co.,Ltd.,Inner Mongolia Non-ferrous Geological Mining Industry(Group);College of Earth Sciences,Institute of Disaster Prevention;Hebei Key Laboratory of Earthquake Dynamics;College of Earth Sciences,Jilin University)

机构地区：[1]内蒙古有色地质矿业(集团)物探勘查有限责任公司,010010 [2]防灾科技学院地球科学学院 [3]河北省地震动力学重点实验室 [4]吉林大学地球科学学院

出　　处：《黄金》2022年第6期12-16,共5页Gold

基　　金：河北省高等学校科学技术研究项目(ZC2022106);中央高校创新团队项目(ZY20215108)。

摘　　要：胶东是中国乃至全球重要金矿资源储备基地,其内金矿床主要受三山岛、焦家及招平3条超大型断裂控制。其中,招平断裂被第四系覆盖严重,深部断裂、岩体及矿体的空间展布很难通过地表地质工作进行预测。通过高精度重力测量、可控源音频大地电磁测深等方法,对招平断裂南段山后金矿区开展地球物理研究。高精度重力测量结果显示,异常曲线整体呈快速上升趋势;岩石密度参数结果显示,新太古界岩石密度为2.77 g/cm^(3),古元古界岩石密度为2.82 g/cm^(3),石英脉及蚀变岩密度为2.92 g/cm^(3),均高于燕山期玲珑二长花岗岩密度(2.57 g/cm^(3));可控源音频大地电磁测深法电阻率剖面显示,玲珑二长花岗岩与古元古界地层接触带存在条带状低阻体,其向东倾斜且呈舒缓波状,低阻体上部存在团块状高阻体。因此,认为该低阻体由招平断裂向南延伸引起。结合钻探验证,-432~-423 m标高发现了矿(化)体,认为矿区深部具有良好的找矿潜力。Jiaodong Peninsula is an important base of gold reserves for China and even the whole world.The gold deposits within are mainly controlled by 3 super large-scale faults namely Sanshandao, Jiaojia and Zhaoping.Among them, Zhaoping Fault is covered severely by Quaternary system, making it difficult to predict the spatial distribution of deep factures, rock mass and ore bodies by surface geological work.High-precision gravity measurement and CSAMT are used to carry out geophysical research on Shanhou Gold District, south part of Zhaoping Fault.The high-precision gravity measurement results show that the anomaly curve on the whole rises rapidly;the rock density parameter results show that the density of rock is 2.77 g/cm^(3),the density of Palaeoproterozoic rock is 2.82 g/cm^(3),the density of quartz vein and altered rock is 2.92 g/cm^(3),all above the density of Yanshanian Linglong monzonitic granite(2.57 g/cm^(3));CSAMT resistivity profile shows that on the contact zone of Linglong monzonitic granite and palaeoproterozoic strata exists stripped low resistance body which inclines eastward and takes the form of stretched wave.Above the low resis-tance body, there is a high resistance lump.Therefore, it is inferred that the low resistance body is caused by the southward stretch of Zhaoping Fault.Verified by drilling, at elevation of-432--423 m discovered ore(mineralized) body.So it is concluded that deep in the district, there are good prospecting potentials.

关 键 词：招平断裂 地球物理 找矿方向 山后金矿区 胶东 

分 类 号：TD15[矿业工程—矿山地质测量]