内蒙古阿拉善左旗塔尔岭铅锌矿地质特征及找矿标志  

Geological characteristics and prospecting criteria of the Taerling lead zinc deposit in the left banner of Alxa,Inner Mongolia

作　　者：王鲲鹏 安兴 陈国辉 高景民 WANG Kunpeng;AN Xing;CHEN Guohui;GAO Jingmin(Sino Shaanxi Nuclear Industry Group Geological Survey Co.,Ltd.,Xi'an 710100;Shaanxi Geological Exploration Institute of Sinochem Geology and Mine Bureau,Xi'an 710065)

机构地区：[1]中陕核工业集团地质调查院有限公司,西安710100 [2]中化地质矿山总局陕西地质勘查院,西安710065

出　　处：《矿产勘查》2020年第6期1138-1145,共8页Mineral Exploration

基　　金：内蒙古地质勘查基金项目(编号:NMKD2013-42)资助。

摘　　要：塔尔岭铅锌矿位于内蒙古阿拉善左旗北部,大地构造位于贺兰山被动陆缘盆地与阿拉善陆块结合部位,成矿带属于华北地台北缘成矿区香池子—沙拉苏沟成矿带,是Pb、Zn、Ag、Au、石墨等重要成矿区。矿体赋存于中-下奥陶统马家沟组构造蚀变带中,蚀变带宽约200 m,呈北东—南西向延伸,与赋矿地层产状基本一致。矿体呈透镜状、脉状产出,地表出露长度50~150 m,厚0.2~7.0 m。刻槽样分析结果显示,Pb品位为3.20%~21.27%,Zn品位为1.79%~15.25%,主要矿石矿物为方铅矿、闪锌矿、铅矾、锌华,伴有黄铁矿、黄铜矿、孔雀石等;脉石矿物主要为白云石、石英等。地球化学异常主要以Cu、Pb、Zn、Ag等中温元素异常为主,伴有W、Mo、Bi异常。激电异常表现为低阻高极化特征。通过对该区地质、地球化学及地球物理特征等综合分析,初步认为塔尔岭铅锌矿为构造热液型铅锌矿。Taerling lead zinc deposi is located in the north of Alxa Left Banner,Inner Mongolia.The geotectonics is located in the junction of Helan mountain passive continental margin basin and Alxa continental block.The metallogenic belt belongs to Xiangchizi-Salasugou metallogenic belt in the north margin of north china platform,which is an important metallogenic area of Pb,Zn,Ag,Au,graphite,etc.The ore body occurs in the structural alteration zone of Majiagou formation of middle lower ordovician,with the alteration bandwidth of about 200 m,extending from northeast to southwest,basically consistent with the occurrence of ore bearing strata.The ore body is lenticular and vein like,with a surface exposed length of 50-150 m and a thickness of 0.2-7.0 m.The results of groove sample analysis show that the grade of Pb is 3.20%-21.27%,and the grade of Zn is 1.79%-15.25%.The main ore minerals are galena,sphalerite,lead alum,zinc oxide,accompanied by pyrite,chalcopyrite,malachite,etc.;the gangue minerals are mainly dolomite,quartz,etc.Geochemical anomalies are mainly Cu,Pb,Zn,Ag and other medium temperature element anomalies,accompanied by W,Mo,Bi anomalies.IP anomalies are characterized by low resistance and high polarization.Based on the comprehensive analysis of the geological,geochemical and geophysical characteristics of the area,it is preliminarily considered that the Taerling lead zinc deposi is of structural hydrothermal type.

关 键 词：塔尔岭铅锌矿 构造蚀变带 矿床地质特征 找矿标志 阿拉善左旗 内蒙古 

分 类 号：P618.42[天文地球—矿床学] P618.43[天文地球—地质学]