發(fā)布時間：2018-03-21 19:25

  本文選題：內(nèi)蒙古長漢卜羅　切入點：鉛鋅銀礦床　出處：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：長漢卜羅鉛鋅銀礦床產(chǎn)于華北克拉通北緣。研究區(qū)自太古代以來經(jīng)歷了漫長的演化歷史,地質(zhì)活動頻繁從而伴隨形成多種類型多金屬礦床。但是對該礦床的研究工作還處于初級階段,認(rèn)識上還存在許多問題,所以需要做進(jìn)一步的研究。礦床屬于少郎河鉛鋅銀成礦帶,研究區(qū)斷裂構(gòu)造發(fā)育,區(qū)域斷裂構(gòu)造以東西向、北東向和北西向為主,構(gòu)成格子狀斷裂系統(tǒng)。區(qū)域巖漿活動強(qiáng)烈,具多期次、多旋回活動的特點。研究區(qū)以鉛鋅礦化為主,伴有金、銀、銅、鉬等礦化,礦床類型以淺成低溫?zé)嵋盒汀⑽◣r型為主。淺成低溫?zé)嵋盒偷V床有長漢卜羅、硐子、西水泉、東水泉、炮手營子等,多為中、小型,除鉛鋅外,還伴生有銀、銅,這些礦床主要分布在燕山期花崗巖類侵入體外接觸帶的晚古生代火山-沉積地層中,少數(shù)礦體分布在燕山期侵入體或火山巖中,呈脈狀,構(gòu)造嚴(yán)格控制其規(guī)模和產(chǎn)狀。長漢卜羅鉛鋅銀礦床處在少郎河鉛鋅銀成礦帶西部。礦區(qū)內(nèi)出露于礦區(qū)東北部,出露地層簡單,巖性主要為二疊系于家北溝組玄武安山巖、安山巖等,是本文的主要研究對象,進(jìn)行礦床地質(zhì)研究,查明礦區(qū)成礦成巖時代,以及礦床的成礦物質(zhì)來源、成礦流體等,探討礦床形成的地球動力學(xué)背景,揭示其成礦機(jī)制,以指導(dǎo)礦區(qū)找礦工作。本文通過巖石學(xué)、礦床學(xué)、地球化學(xué)等手段,在野外觀察和室內(nèi)鑒定的基礎(chǔ)上,采用多種測試方法進(jìn)行研究。得出圍巖蝕變主要在礦脈兩側(cè)發(fā)育,包括黃鐵礦化、絹云母化、硅化、綠泥石化、綠簾石化、碳酸鹽化等。主要金屬礦物有方鉛礦、閃鋅礦、黃鐵礦,其次有黃銅礦、毒砂、白鐵礦、深紅銀礦、黝銅礦、砷黝銅礦、輝砷鈷礦等,其中深紅銀礦為主要的獨立銀礦物。非金屬礦物主要有石英、絹云母、綠泥石、綠簾石、方解石等。成礦過程可劃分為三個階段:(Ⅰ階段)石英-黃鐵礦階段、(Ⅱ階段)多金屬硫化物階段和(Ⅲ階段)石英-碳酸鹽階段。礦床形成可能與近同期的火山-次火山巖漿作用相關(guān),屬淺成低溫?zé)嵋盒偷V床。本文的研究不僅有助于理解淺成低溫?zé)嵋盒豌U鋅銀礦床的成礦機(jī)制,建立成礦模型,還可以為區(qū)域上鉛鋅銀礦床的勘查和開發(fā)提供有力的理論支持。
[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，

本文編號：1645213