甘孜理塘构造带北段金矿成矿构造地质特征及其成矿规律

发布时间：2018-03-19 00:26

本文选题：金矿　切入点：甘孜-理塘构造带　出处：《成都理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：中国经济的发展在进入八十年代后突飞猛进,随着我国人口的增长的速度加剧化,使得国内对各类资源、能源的需求也进入到了白热化的阶段,因此如何满足人类对资源和能源的需求,保障人类经济的持续长期的发展,成为了现今社会发展的核心问题。目前我国的矿产开采过度情况加剧,对于金矿等直接影响经济市场的矿山的开采过度情况更为严重,现如今我国金矿的开发已达到探明储量的2/3,黄金资源短缺,金矿储量的亏空,使得金矿的下一步开发和开采对国家经济变得至关重要,对于金矿成矿规律的研究对国家经济发展,缓解金矿资源压力,有着重大的研究意义及社会意义。甘孜-理塘构造带是一个规模巨大的金多金属成矿构造带。该构造带北起青海玉树,向南东经马尼干戈、甘孜、理塘、木拉到木里。甘孜-理塘构造带金矿虽经过数十年的地质勘查工作,发现了大量的金矿床及矿点,但总体研究程度较低,大部分金矿(化)点仅开展初步地质工作。为了争取今后在该区取得找矿突破,本论文根据甘孜-理塘构造带地区区域地质调查工作情况以及前人在这一地区对金矿研究的前期工作成果,对甘孜-理塘构造带北段金矿成矿构造地质特征及其成矿规律进行总结。在系统的野外地质调查基础上,就该构造带上的典型金矿床成矿地质构造特征进行了分述和对比。总结出区内金矿床(点)的空间分布明显地受韧性剪切带控制,韧性剪切带主要表现为早期北东向南西的逆冲和后期沿近北西-北北西-西北向平移剪切构造改造叠加,属于义敦岛弧与扬子板块之间俯冲碰撞后期反向逆冲构造环境的产物。研究区内金矿成矿作用与早期北东向南西和南西向北东的双向对冲推覆构造作用密切有关。矿体围岩可见铁白云石化、绢云母化、铬云母化、碳酸盐化和石墨化等围岩蚀变,矿体形态、产状均受构造控制,层间破碎带及层间裂隙是矿液运移的通道及容矿场所,控制着矿体的分布及规模。区内次级构造十分发育,断裂和裂隙发育,利于矿液的运移、富集、充填和交代,形成南北和北东-南西走向的含矿带,为后期成矿提供了有利场所。
[Abstract]:With the rapid development of China's economy since 80s, with the rapid growth of the population in China, the domestic demand for all kinds of resources and energy has also entered the stage of white-hot. Therefore, how to meet the needs of human resources and energy resources and ensure the sustained and long-term development of human economy has become the core problem of social development. For mines that directly affect the economic market, such as gold mines, the excessive mining situation is even more serious. Nowadays, the development of gold deposits in China has reached 2 / 3 of the proven reserves, the shortage of gold resources and the deficit of gold reserves. It makes the next development and mining of gold ore become very important to the national economy, and the study of the metallogenic law of gold ore is of great importance to the national economic development and relieve the pressure of gold resources. It is of great significance in research and society. The Ganzi-Litang structural belt is a large gold-polymetallic metallogenic tectonic belt. The tectonic belt starts from Yushu in Qinghai Province to the north, longes Manigango, Ganzi, and Litang to the south. Although the gold deposits in Mula to Muli. Ganzi-Litang structural belt have been discovered after decades of geological exploration work, a large number of gold deposits and ore sites have been discovered, but the overall level of research is relatively low. Most gold (chemical) sites only carry out preliminary geological work. In order to achieve a breakthrough in prospecting in the area in the future, This paper is based on the regional geological survey in the Ganzi-Litang structural zone and the previous work on gold deposits in this area. The geological characteristics and metallogenic regularity of gold deposits in the northern section of the Ganzi-Litang structural belt are summarized. The metallogenic geological characteristics of typical gold deposits in this tectonic belt are described and compared. It is concluded that the spatial distribution of gold deposits (points) in this area is obviously controlled by ductile shear zones. The ductile shear zone is mainly characterized by the early thrust from NNE to NW and the superposition of shearing tectonics along the NNW-NW-NW direction in the late stage. It is the product of reverse thrust tectonic environment in the late period of subduction collision between Yidun island arc and Yangtze plate. Gold mineralization in the study area is closely related to the early north-east-west and south-west two-way counter-nappe tectonics. Iron dolomitization can be seen in the surrounding rock of the orebody, The alteration of surrounding rock, such as sericite, chromium mica, carbonization and graphitization, the shape and occurrence of orebody are controlled by structure. The interlayer fracture zone and interlayer fissure are the passageway and place of ore liquid migration. The distribution and scale of orebodies are controlled. The secondary structures, faults and fissures are well developed in the area, which is conducive to the migration, enrichment, filling and metasomatism of ore fluids, and the formation of ore-bearing belts along the north-south and north-east-west strike. It provides a favorable place for late mineralization.
【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】：P618.51

【参考文献】