内蒙古满洲里地区哈拉胜大型银铅锌矿床地质特征及成矿时代  

GEOLOGICAL CHARACTERISTICS AND METALLOGENIC AGE OF THE LARGE SILVER-LEAD-ZINC DEPOSIT IN HALASHENG OF MANZHOULI AREA,INNER MONGOLIA

作　　者：王景昕 胥嘉[2] 余何 舒广龙[2] 冯德胜 时建民[2] 孙振江 WANG Jing-xin;XU Jia;YU He;SHU Guang-long;FENG De-sheng;SHI Jian-min;SUN Zhen-jiang(College of Earth Sciences,Guilin University of Technology,Guilin 541004,Guangxi Autonomous Region,China;Shenyang Center of Geological Survey,CGS,Shenyang 110034,China;Hezhou College,Hezhou 542899,Guangxi Autonomous Region,China;No.706 Team of Heilongjiang Geological Survey for Nonferrous Metals,Qiqihar 161031,Heilongjiang Province,China)

机构地区：[1]桂林理工大学地球科学学院,广西桂林541004 [2]中国地质调查局沈阳地质调查中心,辽宁沈阳110034 [3]贺州学院,广西贺州542899 [4]黑龙江省有色金属地质勘查706队,黑龙江齐齐哈尔161031

出　　处：《地质与资源》2019年第1期18-24,97,共8页Geology and Resources

基　　金：中国地质调查局项目"大兴安岭成矿带漠河-扎兰屯地区地质矿产调查"(DD20160047)

摘　　要：矿床产于哈拉胜火山穹隆中,成矿与火山-岩浆作用关系密切.钻探和高磁资料显示,火山基底为额尔古纳河组,穹隆核部为次火山岩体,盖层塔木兰沟组和满克头鄂博组火山-沉积岩为容矿围岩.共圈定的11条矿体分布于穹隆东北部,受近南北向张性断裂-裂隙控制,产状较陡. 4条主矿体长500～1400 m,平均厚度1～3 m,延深一般500～900 m.自岩体至围岩化探异常元素组合依次为Bi(-Pb-Ag-As-Mo)→Ag-Pb-Mo-Cu→Pb-Zn-As→Ag-Pb-Zn-Sb→Ag-Pb-Zn-Sb;矿化元素组合依次为Cu(-Mo-PbZn)→Pb-Zn-Ag→Pb-Ag;围岩蚀变由岩体内部向外依次为硅化-钾化-石英绢云母化→夕卡岩化→玉髓化-绿帘石化-绿泥石化-碳酸盐化. 3件岩浆岩锆石U-Pb年龄为161～142 Ma,结合区域典型矿床研究成果,认为矿床成岩成矿于晚侏罗世—早白垩世,成矿年龄为142 Ma.This Ag-Pb-Zn deposit is occurred in the Halasheng volcanic dome,with mineralization closely related to volcano-magmatism.The drilling and high-precision magnetic data show that the volcanic basement is the Ergunahe Formation,with subvolcanic body as the core of the dome and the volcanic-sedimentary cap rocks of Tamulangou and Manketouebo formations as ore-host rocks.The delineated 11 orebodies in the northeast of the dome are controlled by the N-S-trending extensional fault/fracture with steep occurrence.The four main orebodies are 500-1400 m long with an average thickness of 1-3 m and general depths of 500-900 m.The geochemical anomaly element assemblages from the rock body to surrounding rocks are in the order of Bi(-Pb-Ag-As-Mo)→Ag-Pb-Mo-Cu→Pb-Zn-As→Ag-Pb-Zn-Sb→Ag-Pb-Zn-Sb.The mineralized element associations are Cu(-Mo-Pb-Zn)→Pb-Zn-Ag→Pb-Ag in sequence.The wallrock alterations from inside to outside of the rock body are silicification→potash feldspathization→quartz sericitization→skarnization→chalcedonization→epidotization→chloritization→carbonation successively.The zircon U-Pb isotopic age of 3 magmatic rock samples is 161-142 Ma.Combined with the research of regional typical deposits,it is believed that the diagenesis and mineralization occurred in Late Jurassic to Early Cretaceous with a metallogenic age of 142 Ma.

关 键 词：银铅锌矿床 浅成低温热液型 哈拉胜 新巴尔虎右旗 内蒙古 

分 类 号：P618.4[天文地球—矿床学]