西藏拿若铜矿床矿体地质特征解析

发布时间：2018-05-23 17:43

本文选题：西藏 + 拿若铜矿床　；参考：《成都理工大学》2015年硕士论文

【摘要】：西藏拿若铜矿床位于羌塘-三江复合地体板片南缘,班公湖-怒江缝合带的北侧,是班怒成矿带多龙矿集区的重要矿床。拿若铜矿床前人研究多集中在成矿年代学、流体包裹体、矿石、矿化蚀变、成矿元素、物化探异常等方面,地质特征研究极少。而矿体地质特征又是地质特征的核心部分,是成矿作用、控矿构造、成矿结构面、矿床类型、找矿方向等判定的最基本约束,是进一步解决勘察方向、增加储量的重要依据。笔者在全面收集拿若铜矿床相关研究与勘查成果资料的基础上,根据野外考察获得的矿区构造格架、变形样式组合,控矿构造、结构面系统的认识;相关地质体的形成规律,充分考虑相邻探矿工程对地质体圈连的约束,运用平面几何学、立体几何原理,对矿(化)体等地质特征进行立体解析、统计分析,取得如下认识:(1)拿若矿体位于铁格隆山推覆构造扇北扇体的前部带,变形组合样式为系列“Z”型从属褶皱构成的同斜-斜歪褶皱冲断系;(2)拿若铜矿床成岩、成矿均受推覆构造前部带褶皱系控制;成矿结构面为南倾的轴面节理、层面及层间剪切节理;(3)岩浆、成矿流体均有自南部深处向北部浅处运移的趋势,在浅部均具指状突进特点;(4)成岩、成矿均发生于变形后,成矿晚于岩浆侵位,岩体及围岩均可容矿,岩体并非全岩矿化。综合以上认识,推断拿若矿区的矿床成因类型大致属于与浅成-超浅成中酸性斑岩体有关的热液矿床。结合工程控制情况,在矿区深部仍有找矿潜力,西南部隐爆角砾岩边部未得到工程控制,在该区继续寻找与隐爆相关的矿体具有较大潜力。
[Abstract]:The Nauro copper deposit in Tibet is located in the southern margin of the Qiangtang-Sanjiang composite terrane and the northern side of the Bangong Lake-Nujiang suture zone. It is an important deposit in the Dulong ore concentration area of the Banwucheng belt. Previous studies of Naoruo copper deposit mainly focus on metallogenic chronology, fluid inclusions, ores, mineralization alteration, ore-forming elements, geophysical and geochemical anomalies and so on. The geological characteristics of orebodies are the core of geological features, which are the most basic constraints for the determination of ore-forming processes, ore-controlling structures, ore-forming structural planes, ore deposit types and ore-prospecting directions, which are the important basis for further solving the prospecting direction and increasing reserves. On the basis of collecting the related research and exploration results of Nauro copper deposit in an all-round way, the author based on the structural framework, deformation pattern combination, ore-controlling structure and structural plane system of the mining area obtained from field investigation, and the formation law of related geological bodies, Taking fully into account the constraints of adjacent prospecting projects on the contiguity of geological bodies, using the theory of plane geometry and solid geometry, the geological characteristics of ore (chemical) bodies are analyzed in three-dimensional and statistical analysis. The results are as follows: (1) the Naoro orebody is located in the front zone of the northern fan of the Tiegelong mountain nappe, and the deformation and combination style is a series of "Z" type subordinate folds, the synclinal-oblique fold thrust system Jianguo 2) of the Naoluo copper deposit, The ore-forming is controlled by the fold system in the front zone of nappe structure, the ore-forming structure plane is axial joint of southward inclination, the layer and interlaminar shear joint is 3) magma, and the ore-forming fluid is moving from the southern depth to the northern shallow place, and the ore-forming fluid has the tendency of moving from the deep in the south to the shallow place in the north. In the shallow part, there are finger protrusions. The ore-forming occurs after deformation, the mineralization is later than the magma emplacement, the rock mass and the surrounding rock can hold the ore, and the rock mass is not the whole rock mineralization. Based on the above understanding, it is inferred that the genetic types of the Naolo ore deposit are mainly hydrothermal deposits related to the epigenetic and ultra-superficial intermediate-acid porphyry bodies. Combined with the engineering control situation, there is still prospecting potential in the deep part of the mining area, while the edge of the crypto-explosive breccia in the southwest is not controlled by engineering, and it has great potential to continue to search for the orebody related to the hidden explosion in this area.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.41

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