内蒙古昌图锡力地区重磁场特征与深部找矿指示  

Characteristics of gravity and magnetic fields and deep prospecting implications in Changtuxili area,Inner Mongolia

作　　者：马一行[1,2] 吕志成 颜廷杰[1,2] 张世晖 赵金忠[4] 何鹏 刘祖鉴[6] 秦熠[3] MA Yixing;L Zhicheng;YAN Tingjie;ZHANG Shihui;ZHAO Jinzhong;HE Peng;LIU Zujian;QIN Yi(Development and Research Center of China Geological Survey,Beijing 100037,China;Technical Guidance Center for Mineral Resources,Ministry of Natural Resources,Beijing 100083,China;China University of Geosciences,Wuhan 430074,Hubei,China;Inner Mongolia Institute of Geological Survey,Hohhot 010020,Inner Mongolia,China;Tianjin Center,China Geological Survey,Tianjin 300170,China;China Aero Geophysical Survey and Remote Sensing Center for Natural and Resources,Beijing 100083,China)

机构地区：[1]中国地质调查局发展研究中心,北京100037 [2]自然资源部矿产勘查技术指导中心,北京100083 [3]中国地质大学(武汉),湖北武汉430074 [4]内蒙古自治区地质调查院,内蒙古呼和浩特010020 [5]中国地质调查局天津地质调查中心,天津300170 [6]中国自然资源航空物探遥感中心,北京100083

出　　处：《地质通报》2020年第8期1258-1266,共9页Geological Bulletin of China

基　　金：国家重点研发计划项目课题《深部矿产资源三维找矿预测评价示范》(编号:2017YFC0601506)。

摘　　要：内蒙古昌图锡力地区位于大兴安岭成矿带南段西坡,成矿条件优越。前期研究发现,区内的银铅锌多金属矿产与中生代火山机构和中酸性岩浆的侵入有关,由于覆盖较厚,勘查程度不高,只依靠地表地质工作难以确定火山机构分布和侵入岩体的空间位置,不利于区内实现深部找矿突破。通过对磁测数据进行构造分析,揭示其可能为火山机构的放射状构造特征,推测构造18条,通过开展1∶20000重力测量,并对重力场进行剩余异常提取、功率谱分析等处理,发现1处可能为隐伏侵入岩体引起的局部低重力异常,经计算其场源近似深度约1002.5 m。研究结果指示了区内可能的隐伏火山机构分布和侵入岩体空间位置,为该地区下一步开展深部找矿和钻探验证工作提供了重要参考。The Changtuxili area in Inner Mongolia is located on the west slope of the southern section of the Da Hinggan Mountains metallogenic belt.Its metallogenic conditions are superior.It is found that the Ag-Pb-Zn polymetallic deposits in this area are related to the invasion of Mesozoic volcanic apparatus and intermediate acid magma.However,due to the thick coverage and low exploration level,it is difficult to determine the distribution of volcanic apparatus and the spatial location of intrusive rock mass only relying on the surface geological work,which is not conducive to the deep exploration breakthrough in the area.Through the fracture analysis of the magnetic survey data,the authors revealed the radial structure characteristics that may be volcanic apparatus,and inferred 18 structures.Through the 1∶20000 gravity survey, residual anomaly extraction and power spectrum analysis of the gravity field, a low gravityanomaly that may be caused by the concealed intrusive rock mass was found, and the approximate depth of the field source was calculated to be about 1002.5 m.The results indicate the distribution of the potential hidden volcanic apparatus and the spatial location of the intrusive rock mass,which provides an important reference for the further exploration and drilling verification work in this area.

关 键 词：昌图锡力 重磁场特征 火山机构 侵入岩体 深部找矿 

分 类 号：P631.2[天文地球—地质矿产勘探]