太行山中段寺沟岩体电性结构分析及深部成矿预测  

The geoelectric structure characteristics and mineral prospecting of the Sigou rock mass in Middle Taihang Mountain

作　　者：孔志召[1] KONG Zhi-Zhao(Airborne Survey and Remote Sensing Center of Nuclear Industry,Shijiazhuang 050002,China)

机构地区：[1]核工业航测遥感中心,河北石家庄050002

出　　处：《物探与化探》2018年第5期882-888,共7页Geophysical and Geochemical Exploration

基　　金：河北省地勘专项资金项目(冀地(2014)12号)

摘　　要：寺沟岩体是太行山中段与麻棚岩体同期次的燕山期中酸性岩体。多年来在该地区开展了大量的地质、物探工作,并发现了斑岩-隐爆角砾岩型银及多金属硫化物矿床。但由于对岩体空间展布特征不明确,其深部找矿远景一直以来存有疑义。此次通过开展音频大地电磁测量(简称AMT,下同),利用岩体与围岩之间明显的电性差异,较好地划分了岩体与围岩的界线,并绘制了岩体的空间展布形态,认为寺沟岩体电性结构主要表现为"Y"字型低阻体,其上部出露为岩脉,下部为隐伏岩体,在分叉复合部位"凹"字型低阻带附近形成隐爆角砾岩筒,易形成隐爆角砾岩型多金属硫化物矿床;在高低阻梯度带部位(内带),为岩体与围岩接触部位,有利于形成蚀变带型多金属硫化物矿床。The Sigou rock mass is a Yanshanian acid rock mass in the middle of the Taihang Mountain and has the same formation period with the Mapeng rock mass. Lots of geological and geophysical work has been carried out in the past years,and porphyry crytptoexplosive breccia type silver and polymetallic sulfide deposits have been found. However,due to the uncertainty of the spatial distribution of the rock mass,the deep exploration prospect has been doubtful. In this paper,the author employed Audio Magnetotelluric（ AMT） to divide the boundary of the rock mass based on obvious electrical differences from the surrounding rock,and drew the spatial distribution characteristics. It is believed that the electrical structure of the Sigou rock mass is mainly characterized by ＂ Y＂ type low resistivity,with the upper part being exposed veins,and the lower part being hidden rock mass. The bifurcation compounding part of the ＂ concave＂ low-resistance zone is favorable for the formation of cryptoexplosive breccia polymetallic sulfide deposits,whereas the high and low resistance gradient zone（ inner zone） is the contact part between the rock mass and the surrounding rock,which is conducive to the formation of alteration belt type polymetallicl sulfide deposits.

关 键 词：寺沟岩体 隐爆角砾岩 音频大地电磁测量 电性结构 成矿预测 

分 类 号：P618[天文地球—矿床学]