黔西北铅锌成矿带成矿地质条件与找矿标志  

Metallogenic geology condition and prospecting symbol of lead-zinc ore belt in northwest Guizhou Province

作　　者：宋振涛[1,2] 管少斌[1] 牛禹[1] 王均 李霄 山亚[1] 孙栋华 SONG Zhentao GUAN Shaobin NIU Yu WANG Jun LI Xiao SHAN Ya SUN Donghua(Airborne Survey and Remote Sensing Center of Nuclear Industry ,Shijiazhuang 050002, Hebei, China Uranium Resource Key Laboratory of Geophysical Exploration Technology Center of CNNC ,Shijiazkuang 050002,Hebei ,China The Geological Team No. 113, Guizhou Provincial Burean of Geology and Mineral Resources ,Liupanshui 553001 ,Guizhou ,China Hebei University of Geosciences , Shij iazhuang 050031, Hebei ,China)

机构地区：[1]核工业航测遥感中心,河北石家庄050002 [2]中核集团铀资源地球物理勘查技术中心重点实验室,河北石家庄050002 [3]贵州省地矿局一一三地质大队,贵州六盘水553001 [4]河北地质大学,河北石家庄050031

出　　处：《矿产与地质》2017年第3期460-471,共12页Mineral Resources and Geology

基　　金：<贵州省威宁县盐仓镇凉水沟地区激电中梯测量>项目资助

摘　　要：黔西北铅锌成矿区处于川-滇-黔铅锌银成矿域东侧,成矿地质条件优越,已发现多处大中型铅锌矿床,是我国一条重要的多金属成矿带。通过对区内典型矿床凉水沟铅锌矿的地层、岩性、构造、岩浆活动、围岩蚀变和物化探特征的分析,认为该铅锌矿床主要是以岩性为主导因素的中低温热液矿床,同时受到构造活动的控制;矿化产于下石炭统大埔组白云岩中,具有顺层展布特征;构造部位位于背斜轴部及两翼的NWW向次级断裂,矿体呈透镜状、似板状、囊状,金属矿物主要为铅锌硫化物。通过分析总结区域上影响成矿的主要条件,认为地层岩性和构造活动对成矿意义重大,晚二叠世峨眉山玄武岩大量喷发促使了矿床的形成。结合黔西北成矿条件和潜力提出了找矿标志:石炭系蚀变碳酸盐岩为地层、岩性标志;NE向与NW断裂交汇部位,以及NW向断裂内的次级断层、层间破碎带、褶皱发育地段是构造标志;铁帽可作为地表找矿标志;区域低电阻率、高极化率和地球化学异常是找矿的地球物理和地球化学标志。Northwest Guizhou Pb-Zn metallogenic area is located on the east side of Sichuan-Yunnan-Guizhou Pb-Zn-Ag metallogenic domain.With the superior metallogenic geology condition,it is an important polymetallic mineralization belt in China,and there have been found out for many middle-large scale Pb-Zn deposits.Through the analysis of strata,lithology,structure,magmatic activity,wall-rock alteration and geophysical and geochemical characteristics of the typical Pb-Zn deposit in Liangshuigou,it is proposed that the Pb-Zn deposit is a low-middle temperature hydrothermal deposit mainly controlled by the strata and the structural activity.The mineralization occurs in the dolomite of Dapu Formation in Lower Carboniferous system,with the characteristics of bedding distribution.The structural parts are located on the NWW secondary faults in the anticlinal axis and two wings.The ore bodies are in lenticular,similar plate and bladder shape,and the metallic minerals are mainly Pb-Zn sulfide.On the basis of analysis and summary of the main influence conditions in the mineralization area,it is concluded that strata lithology and tectonic activity are of great significance to mineralization,and the eruption of late Permian Emeishan basalt leaded to the deposit formation.Besides,the prospecting symbols are pointed out with combination of the metallogenic conditions and exploration potential of northwest Guizhou.The altered carbonate rock of Carboniferous system is the stratum and lithology mark,the secondary fault,interlayered fracture zone and fold-developed section insides NW fracture are structural sign,gossan can be used as a surface prospecting indicator,while geophysical anomalies of regional low resistivity,high polarizability and geochemical anomalies are also prospecting marks as well.

关 键 词：凉水沟铅锌矿 成矿带 成矿条件 找矿标志 黔西北 

分 类 号：P618.4[天文地球—矿床学]