内蒙古高尔旗铅锌银矿床地质特征及成因初探

发布时间：2018-08-20 08:35

【摘要】：阿巴嘎北部区是二连-东乌珠穆沁旗成矿带的重要组成部分,区内的高尔旗矿床是该区具有代表性的铅锌银多金属矿床。本文在野外地表调查的基础上,并辅以槽探、钻探工程,通过岩石学、矿物学、硫铅同位素等研究工作,分析探讨了高尔旗矿床的地质特征及成矿过程。高尔旗铅锌银矿床矿体大多呈脉状、透镜状沿中下泥盆统泥鳅河组变质砂岩与石炭世斑状中细粒正长花岗岩接触带分布。铅锌银矿体主要由5种类型矿石所构成,即脉状-网脉状矿石、块状-致密块状矿石、角砾状矿石、条带状矿石、浸染状矿石。矿物组分有闪锌矿、方铅矿、黄铁矿、白铁矿、软锰矿,个别样品中可见少量黄铜矿、辉银矿。围岩蚀变自矿体中心向外分别为硅化、碳酸盐化、绿泥石化、绿帘石化及高岭石化。经野外勘查并辅以硫、铅同位素分析结果,发现高尔旗铅锌银矿床是多期次和多阶段热液活动的产物,包括有2期4个成矿阶段,即热液成矿作用期(多金属硫化物阶段、石英-富银硫化物阶段及萤石-碳酸盐阶段)和表生成矿作用期。成矿物质主要来源于变质砂岩及二长花岗岩,推断该矿床为岩浆期后热液脉状铅锌矿床,成矿时代为晚古生代。
[Abstract]:The northern part of Abaga is an important part of Erlian-Dongwuzhumqin Banner metallogenic belt, and the Golqi deposit is a typical Pb-Zn-Ag polymetallic deposit in this area. Based on the field surface investigation, supplemented by trench exploration and drilling engineering, the paper analyses and discusses the high content of Pb-Pb isotope and mineralogy. Geological characteristics and metallogenic process of the Erqi deposit.Most of the ore bodies of the Golqi Pb-Zn-Ag deposit are vein-like and lenticular along the contact zone between the metamorphic sandstone of the Middle-Lower Devonian Dehouhe Formation and the Carboniferous porphyry medium-fine-grained syenite.The Pb-Zn-Ag ore bodies are mainly composed of five types of ores,i.e.vein-reticulate ore,massive-compact massive ore. The mineral components are sphalerite, galena, pyrite, leucite, pyrolusite, and a small amount of chalcopyrite and argentite can be seen in individual samples. The wall rock alteration from the ore body center outward is silicification, carbonation, chloritization, epidote and KAOLINIZATION respectively. The results show that the Gaoerqi Pb-Zn-Ag deposit is the product of multi-stage and multi-stage hydrothermal activities, including two metallogenic stages, namely, HYDROTHERMAL METALLOGENIC stage (polymetallic sulfide stage, quartz-silver-rich sulfide stage and fluorite-carbonate stage) and supermineralization stage. The granite is inferred that the deposit is a post magmatic hydrothermal vein lead zinc deposit, and its metallogenic epoch is late Paleozoic.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.4;P618.52

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