内蒙古下护林铅锌银矿床地质特征、控矿因素及找矿标志  

Geological characteristics,ore-controlling factor and prospecting indicator of Xiahulin Pb-Zn-Ag deposit in Inner Mongolia

作　　者：刘忠诚 孙晶 LIU Zhongcheng;SUN Jing(Inner Mongolia sixth geological and Mineral Exploration and Development Co,Ltd.,Hulunbuir,021000,Neimenggu,China;Inner Mongolia Coal Geological Exploration(Group)No.109 Co.,Ltd.,Hulunbuir 021000,Inner Mongolia,China)

机构地区：[1]内蒙古第六地质矿产勘查开发有限责任公司,内蒙古呼伦贝尔021000 [2]内蒙古煤炭地质勘查(集团)一零九有限公司,内蒙古呼伦贝尔021000

出　　处：《矿产与地质》2023年第4期718-727,共10页Mineral Resources and Geology

摘　　要：内蒙古下护林铅锌银矿床位于额尔古纳地块吉尔布干断裂带南段,系额尔古纳晚元古代变质地体内的铅锌矿区之一。为总结额尔古纳地块铅锌银多金属成矿作用和产出规律,对下护林铅锌银矿床开展详细研究。在总结该矿床地质特征的基础上,对控矿因素及矿化富集规律进行分析总结,进而推断矿床成因,最后还归纳了找矿标志。研究表明,矿体赋存于侏罗纪花岗岩与震旦系额尔古纳河组侵入接触断裂复合构造带中的大理岩一侧,呈脉状断续分布,围岩蚀变发育,主要为矽卡岩化和中低温热液蚀变的硅化、碳酸盐化、黄铁矿化和萤石化,并且硅化越强,铅锌矿体品位越高。花岗岩边部的石英斑岩与额尔古纳河组大理岩断裂接触带构成了成矿结构面,其发育程度控制了矿体规模,是最主要的矿化富集规律,而地层岩性、构造、岩浆岩则是影响成矿结构面发育程度的主要控矿因素。矿床成因类型为中低温热液充填交代型脉状矿床。研究成果可为后续该矿床的勘查及额尔古纳地块同类型矿区的铅锌银多金属矿研究提供参考。Xiahulin Pb-Zn-Ag deposit,located in the south part of Jierbugan Fault Zone of Erguna Block,Inner Mongolia,is one of the Pb-Zn deposits in the Late Proterozoic metamorphic terrane of Erguna block.In order to summarize the lead-zinc-silver polymetallic mineralization and its occurrence regularity in Erguna block,the Xiahulin lead-zinc-silver deposit is studied in detail.On the basis of summary of the geological characteristics of the deposit,the ore-controlling factors and the regularity of mineralization enrichment are analyzed and summarized.The study result shows that the ore bodies occur on the marble side of the complex structural belt of Jurassic granite and Eergunahe formation intrusive contact fault of Sinian system.The development of wall rock alteration mainly involves skarnization and medium to low temperature hydrothermal alteration,including silicification,carbonation,pyritization,and fluoritization.The stronger the silicification,the higher the grade of the lead zinc ore body.The contact zone between quartz porphyry and marble fracture of Ergunahe Formation on the edge of granite constitutes a metallogenic structural plane,whose development degree controls the ore body size and is the main regularity of mineralization enrichment.The formation lithology,structure and magmatic rock are the main ore-controlling factors that affect the development of metallogenic structural plane.The genetic type of the deposit is a medium to low temperature hydrothermal filling metasomatic vein type deposit.The research result can provide a reference for the subsequent exploration of the deposit and the study of Pb-Zn-Ag polymetallic deposit at the same type of mining area in Erguna block.

关 键 词：铅锌银矿 地质特征 控矿因素 找矿标志 内蒙古下护林 

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