湘西李梅MVT铅锌矿区层状角砾岩地质特征和找矿意义

发布时间：2018-01-30 15:35

本文关键词： 湘西李梅层状角砾岩蚀变型角砾岩　出处：《中国地质大学(北京)》2017年硕士论文　论文类型：学位论文

【摘要】：湘西北李梅层状铅锌矿为MVT铅锌矿,其主要特征为品位较低、规模巨大、矿种相对单一、易于采选,是湘西张家界花园整装勘查区的主要找矿类型,具有极高的经济效益和研究价值。该类矿床与层状角砾岩相伴生。角砾的形成时间和空间分布,角砾的大小、形态及其破碎程度影响着矿石的交结形式和空间产出状态,进而影响矿体展布和矿石的贫富产出。层状角砾岩对于成矿规律和找矿分布都是重要标志。可以说李梅矿区角砾岩的形成与演化史就是该区的地质矿产衍化史。但是对于层状角砾岩的空间分布和蚀变特征缺乏系统的研究。对李梅矿区角砾岩的分布、蚀变分类等研究对于了解成矿的控制因素和矿化的富集部位,揭开李梅矿区矿床的成矿标志及其找矿突破有着非常深远的意义。研究工作受到项目“湘西张家界花园整装勘查区矿田地质研究和找矿”的支持,在导师的指导下,选择《湘西李梅MVT铅锌矿层状角砾岩分布、成矿标志分类和找矿意义》作为学位论文题目,在2年野外地质工作的基础上,结合室内分析,镜下观察和综合研究。根据角砾岩空间产出层位区分、破碎程度差异、矿化蚀变特征以及形成机制等对研究区内的角砾岩进行详细的研究。完成论文的编写,本论文研究取得以下进展:1、编制李梅矿区清虚洞组层状角砾岩三维分布图,该图根据80多个钻孔结合10条实测剖面将李梅矿区层状角砾岩分为上、中、下三段。其中,中段的含矿性最好。2、根据蚀变矿物种类和蚀变复杂程度划分了层状角砾岩的类型,将角砾岩分为简单蚀变矿物型角砾岩、复杂蚀变矿物型角砾岩,分析表明复杂蚀变矿物型角砾岩的含矿性更好。3、提出寻找含矿层位和富矿层位的角砾岩找矿标志,将简单蚀变矿物型角砾岩作为地质找矿的角砾岩找矿标志,复杂蚀变矿物型角砾岩作为寻找富矿体的找矿标志。
[Abstract]:The stratified lead-zinc deposit of Li Mei in northwest Hunan is a MVT lead-zinc deposit, which is characterized by its low grade, large scale, relatively single ore species and easy to be mined. It is the main prospecting type in the integrated exploration area of Zhangjiajie Garden, western Hunan. This kind of deposit is associated with layered breccia, the formation time and space distribution of breccia, the size of breccia. The morphology and the degree of fragmentation affect the intersecting form and spatial state of ore. The stratified breccia is an important symbol for metallogenic law and ore prospecting distribution. It can be said that the formation and evolution of breccia in Li Mei mining area is the history of geological and mineral evolution in this area. However, the spatial distribution and alteration characteristics of stratified breccia are not systematically studied, and the distribution of breccia in Li Mei mining area is also studied. The study of alteration classification is helpful to understand the controlling factors of mineralization and the location of mineralization enrichment. It is of great significance to uncover the ore-forming mark of Li Mei ore deposit and its breakthrough in prospecting. The research work is supported by the project "Mineral Field Geological Research and Prospecting in Zhangjiajie Garden, Western Hunan Province". Under the guidance of tutor, "stratified breccia distribution, metallogenic marker classification and prospecting significance" of Li Mei MVT lead-zinc deposit in western Hunan Province was selected as the subject of the dissertation, on the basis of 2 years' field geological work. Combined with indoor analysis, microscopic observation and comprehensive study. According to breccia spatial production horizon differentiation, fragmentation degree difference. The mineralized alteration characteristics and formation mechanism of breccia in the study area were studied in detail. The three-dimensional distribution map of stratified breccia in Qingxudong formation of Li Mei mining area is compiled. According to more than 80 boreholes and 10 measured sections, the stratiform breccia in the coal mine area of Li Mei is divided into three sections: upper, middle and lower. According to the types of altered minerals and the complexity of alteration, the breccia is divided into simple altered mineral breccia and complex altered mineral breccia. The analysis shows that the ore-bearing properties of complex altered mineral breccia are better than that of metamorphic breccia, and the prospecting criteria of ore-bearing and ore-rich breccia are put forward. The simple altered mineral breccia is used as the prospecting mark of geological prospecting, and the complex altered mineral breccia is used as the prospecting mark of rich orebody.
【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】：2017
【分类号】：P618.4

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