内蒙古长汉卜罗铅锌银矿床地质特征与成因探讨

发布时间：2018-03-21 19:25

  本文选题：内蒙古长汉卜罗　切入点：铅锌银矿床　出处：《中国地质大学(北京)》2015年硕士论文　论文类型：学位论文

【摘要】：长汉卜罗铅锌银矿床产于华北克拉通北缘。研究区自太古代以来经历了漫长的演化历史,地质活动频繁从而伴随形成多种类型多金属矿床。但是对该矿床的研究工作还处于初级阶段,认识上还存在许多问题,所以需要做进一步的研究。矿床属于少郎河铅锌银成矿带,研究区断裂构造发育,区域断裂构造以东西向、北东向和北西向为主,构成格子状断裂系统。区域岩浆活动强烈,具多期次、多旋回活动的特点。研究区以铅锌矿化为主,伴有金、银、铜、钼等矿化,矿床类型以浅成低温热液型、矽卡岩型为主。浅成低温热液型矿床有长汉卜罗、硐子、西水泉、东水泉、炮手营子等,多为中、小型,除铅锌外,还伴生有银、铜,这些矿床主要分布在燕山期花岗岩类侵入体外接触带的晚古生代火山-沉积地层中,少数矿体分布在燕山期侵入体或火山岩中,呈脉状,构造严格控制其规模和产状。长汉卜罗铅锌银矿床处在少郎河铅锌银成矿带西部。矿区内出露于矿区东北部,出露地层简单,岩性主要为二叠系于家北沟组玄武安山岩、安山岩等,是本文的主要研究对象,进行矿床地质研究,查明矿区成矿成岩时代,以及矿床的成矿物质来源、成矿流体等,探讨矿床形成的地球动力学背景,揭示其成矿机制,以指导矿区找矿工作。本文通过岩石学、矿床学、地球化学等手段,在野外观察和室内鉴定的基础上,采用多种测试方法进行研究。得出围岩蚀变主要在矿脉两侧发育,包括黄铁矿化、绢云母化、硅化、绿泥石化、绿帘石化、碳酸盐化等。主要金属矿物有方铅矿、闪锌矿、黄铁矿,其次有黄铜矿、毒砂、白铁矿、深红银矿、黝铜矿、砷黝铜矿、辉砷钴矿等,其中深红银矿为主要的独立银矿物。非金属矿物主要有石英、绢云母、绿泥石、绿帘石、方解石等。成矿过程可划分为三个阶段:(Ⅰ阶段)石英-黄铁矿阶段、(Ⅱ阶段)多金属硫化物阶段和(Ⅲ阶段)石英-碳酸盐阶段。矿床形成可能与近同期的火山-次火山岩浆作用相关,属浅成低温热液型矿床。本文的研究不仅有助于理解浅成低温热液型铅锌银矿床的成矿机制,建立成矿模型,还可以为区域上铅锌银矿床的勘查和开发提供有力的理论支持。
[Abstract]:The Changhamblo lead-zinc-silver deposit occurs in the northern margin of the North China Craton. The study area has undergone a long history of evolution since the Archean. The frequent geological activities and the formation of many types of polymetallic deposits are accompanied by the formation of many types of polymetallic deposits. However, the study of the deposit is still in its infancy, and there are still many problems in understanding it. Therefore, further research is needed. The deposit belongs to the Shaolanghe lead-zinc-silver metallogenic belt, and the fault structures in the study area are developed, and the regional fault structures are mainly east-west, NE and NW, forming a latticed fault system. The regional magmatic activity is strong. The study area is characterized by lead-zinc mineralization with mineralization of gold, silver, copper, molybdenum, etc. The types of deposit are epithermal hydrothermal type and skarn type. Xishuiquan, Dongshuiquan and Batouyingzi are mostly medium and small. In addition to lead and zinc, they are accompanied by silver and copper. These deposits are mainly distributed in the late Paleozoic volcanic-sedimentary strata where granitoids intruded into the external contact zone during the Yanshanian period. A few orebodies are distributed in Yanshanian intrusions or volcanic rocks, and their size and occurrence are strictly controlled by tectonics. The Changhamblo Pb-Zn-Ag deposit is located in the west of the Shaolanghe Pb-Zn-Ag metallogenic belt. The exposed strata are simple, the lithology is mainly composed of Black Tortoise andesite, andesite and so on of the Permian Yujiabigou formation, which is the main research object of this paper. The ore deposit geology is studied to find out the metallogenic age of the ore area and the source of the ore-forming material. In this paper, the geodynamic background of ore deposit formation is discussed, and its metallogenic mechanism is revealed in order to guide the prospecting work in the mining area. Based on field observation and laboratory identification, this paper, by means of petrology, ore deposit science, geochemistry, etc. It is concluded that the wall rock alteration is mainly developed on both sides of the vein, including pyrite, sericite, silicification, green mud petrifaction, green curtain, carbonation, etc. The main metal minerals are galena, sphalerite, etc. Pyrite, followed by chalcopyrite, arsenopyrite, bauxite, crimson silver, tetrahedrite, tetrahedrite, arsenopyrite, cobalt arsenite, etc. Among them, crimson silver is the main independent silver mineral. Non-metallic minerals are mainly quartz, sericite, chlorite, green curtain, etc. Calcite and so on. The metallogenic process can be divided into three stages: (I) quartz-pyrite stage (鈪，

本文编号：1645213