西藏甲玛铜多金属矿厚大富铜矿体赋存规律研究

发布时间：2018-05-16 11:06

本文选题：西藏 + 冈底斯成矿带　；参考：《成都理工大学》2017年硕士论文

【摘要】：西藏冈底斯成矿带是我国三大重要斑岩成矿带之一,甲玛铜多金属矿床是西藏冈底斯中段东部的超大型斑岩-矽卡岩矿床,探明矽卡岩型矿体铜钼铅锌金银均达大型以上规模,具有重要的经济意义和研究意义。前人对矿床的研究已取得大量成果,现已查明区域地质背景、矿床地质特征、成矿元素分带特征、矽卡岩矿物蚀变与分带、成岩成矿年代学、流体演化等,并提出了“四位一体”矿床成矿模式与勘查模型。然而甲玛矿床还有一些问题尚未得到解决,例如铜山-南坑地区由于构造复杂,历来少有此区域研究资料,前人尚未对铜山南坑地区铜富矿体及其与侵入岩体的关系进行深入系统地研究。故本文在充分收集矿区资料的基础上系统总结甲玛斑岩成矿系统特征,全面、系统地研究和分析铜山南坑铜富矿体特征及其与侵入岩体的关系,以期查明铜富矿体控矿机制。冈底斯成矿带目前已发现并评价包括甲玛-驱龙-邦浦矿集区的5个重要矿集区。前人建立的甲玛“四位一体”成矿模式产于斑岩中的铜钼矿体、角岩中的铜钼(金银)矿体、矽卡岩中的铜多金属矿体以及外围的独立金矿体。矿区地层主要出露形成于中生代的上侏罗统多底沟组(J3d)、下白垩统林布宗组(K1l)与第四系沉积物。区内主要构造线为北西西向,发育复式褶皱体系,其中尤以铜山滑覆构造和甲玛-卡军果推覆构造系最为重要。岩浆岩主要由6期基-中酸性侵入岩体构成。基于矿床最新的勘查资料和研究成果,根据矿区工业推荐指标Cu1%圈定铜富矿体,系统地统计分析了富铜矿体在平面和剖面上的分布特征和产出状态。探矿工程研究表明矿区存在3个铜富矿体浓集中心:由19-23-27线剖面控制的北西部牛马塘地区、由主要由0-4-8-12-16线剖面控制的中部隐伏斑岩体接触带附近与由38-52-54-58线剖面控制的铜山南坑地区。富矿体矿石矿物主要为组合斑铜矿+黄铜矿+黝铜矿±方铅矿+闪锌矿,脉石矿物以矽卡岩矿物为主。与富铜矿石有关的蚀变主要为硅化、碳酸盐化以及矽卡岩的退化蚀变。电子探针分析表明斑岩接触带附近铜富矿体与铜山南坑铜富矿体相比,含铜矿物Fe、Ag含量更高,Cu、Co值较低。经充分分析研究表明甲玛矿区铜富矿体控矿因素主要分为:斑岩接触带控矿、背斜控矿和滑覆体控矿。与世界上其他manto型矿床(体)对比研究,认为铜山滑覆体内的富矿体为斑岩成矿系统外围的manto型矿体。深部隐伏斑岩体接触带、铜山南坑Manto型矿体南西向外围、碳酸盐地层中褶皱核是甲玛矿床富矿体下一步找矿的关键部位。
[Abstract]:The Gangdis metallogenic belt in Tibet is one of the three important porphyry metallogenic belts in China. The Jiama copper polymetallic deposit is a very large porphyry skarn deposit in the eastern part of Gangdis, Tibet. The copper, molybdenum, lead, zinc, gold and silver ore bodies of the skarn type have all reached a large scale. Has the important economic significance and the research significance. A great deal of achievements have been made in the study of ore deposits by predecessors. The regional geological background, the geological characteristics of ore deposits, the zoning characteristics of metallogenic elements, the alteration and zoning of skarn minerals, the diagenesis and metallogenic chronology, the fluid evolution, etc., have been identified. The metallogenic model and exploration model of the "four-in-one" deposit are put forward. However, there are still some unsolved problems in the Jiama deposit. For example, the Tongshan-Nankeng area, because of its complicated structure, has always been a rare regional research material. The relationship between copper rich orebody and intrusive rock mass in Nankeng area of Tongshan has not been studied systematically. Therefore, this paper systematically summarizes the ore-forming system characteristics of Jiama porphyry on the basis of fully collecting the data of mining area, studies and analyzes systematically the ore-rich orebody characteristics of Tongshan Nankeng copper orebody and its relation with intrusive rock mass, in order to find out the ore-controlling mechanism of copper ore-rich ore body. The Gangdis metallogenic belt has found and evaluated five important ore accumulation areas including the Jiama-Dulong-Bangpu ore accumulation area. The "four-in-one" metallogenic model of Jiama was established in the copper-molybdenum ore body in porphyry, the copper-molybdenum (gold-silver) orebody in hornstone, the copper-polymetallic ore body in skarn and the independent gold ore body in the periphery. The strata of the mining area are mainly exposed from the upper Jurassic Dodegou formation of the Upper Jurassic and the Lower Cretaceous Linbuzong formation K1l) and the Quaternary sediments. The main tectonic lines in the area are NW trending, and the complex fold system is developed, especially the Tongshan slip structure and the Jiarma-Kagunguo nappe system. Magmatic rock is mainly composed of 6-stage-intermediate-acid intrusive rock mass. Based on the latest exploration data and research results, the distribution characteristics and occurrence state of copper rich ore bodies in plane and profile are analyzed systematically according to the industrial recommendation index Cu 1% for delineating copper rich ore bodies. Prospecting engineering research shows that there are three concentration centers of copper rich ore bodies in the mining area: Niumatang area in the north and west, controlled by the section of the 19-23-27 line. Near the contact zone of the central occult rock mass controlled by the section of line 0-4-8-8-12-16 and the Nankeng area of Tongshan by the section of line 38-52-54-58. The ore-rich ore minerals are mainly composed of chalcopyrite, chalcopyrite and sphalerite, and skarn minerals are the main gangue minerals. The alteration related to copper-rich ore is mainly silicification, carbonization and degenerative alteration of skarn. The electron probe analysis shows that the copper-rich ore body near the porphyry contact zone is lower than the copper rich orebody in Tongshan Nankeng. The results show that the ore-controlling factors of copper rich ore body in Jiama mine are mainly divided into porphyry contact zone ore-controlling anticline ore-controlling and sliding ore-controlling. Compared with other manto type deposits in the world, it is considered that the ore-rich body in Tongshan slip body is manto type orebody outside porphyry metallogenic system. The deep concealed porphyry contact zone, the south west periphery of the Manto type orebody in Tongshan Nankeng, and the fold core in carbonate formation are the key points for the next prospecting of the ore-rich body in Jiama deposit.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.2

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