贵州晴隆大厂锑矿流体包裹体特征研究及意义

发布时间：2018-06-06 17:48

  本文选题：流体包裹体 + 大厂锑矿　； 参考：《成都理工大学》2017年硕士论文

【摘要】：晴隆大厂锑矿位于贵州省晴隆县大厂镇,贵州是我国重要的锑矿产地之一。大地构造位置位于华南-东南亚板块,靠近特提斯—喜马拉雅与濒太平洋两大全球构造域的结合部位东侧,大地构造位置很特殊,属大陆板块内部范畴。前人对晴隆大厂锑矿床有过矿床地质特征、锑的赋存形式、矿床地球化学特征和矿床成因等方面的研究,积累了一定的研究资料,矿床成因类型也只通过宏观地质特征进行分类的,总体来说,研究程度相对薄弱。尤其是在成矿流体方面,前人对此没有完善的流体包裹体研究成果,而成矿热液特征与矿床成因息息相关,运用矿床地球化学特征分析可以获取最直观有效的信息。通过包裹体特征分析可以为矿床成因类型提供最有价值的证据。本文从大厂锑矿流体包裹体显微岩相学入手,着重对流体包裹体进行分析测试和相关计算(均一温度、冰点、盐度、压力、成矿深度、流体包裹体成分等),判断其成矿热液类型并进一步确立其矿床成因类型。通过对晴隆大厂锑矿的详细野外地质调查和样品详细分类分析,基本了解了该矿床的地质特征和矿体的产状、规模及数量,对矿床有了整体的认识。微观上进行了薄片、光片和包裹体片的研究。利用偏光显微镜对薄片和光片进行显微岩相学、矿相学研究,了解矿床的矿物共生组合、矿物生成顺序等信息。利用冷热台对包裹体片进行流体包裹体测温实验,获取流体包裹体的均一温度和冰点数据,进而推算出盐度、压力、深度、密度等信息,对矿床的成矿环境、成矿流体性质、成矿流体来源、成矿物质运移和沉淀方式进行讨论。最后结合前人对于稳定同位素、包裹体气液相成分等研究成果,建立晴隆大厂锑矿成矿模式。本次论文研究主要得到了以下认识和成果:晴隆大厂锑矿矿床流体包裹体类型包括:气液两相包裹体、纯液相包裹体,其中以纯液相包裹体为主,气液两相包裹体次之,主要测定了气液两相液体型包裹体的完全均一温度和冰点,并通过公式计算出了石英流体包裹体盐度、密度、压力,大致推算了成矿深度。得出大厂锑矿成矿流体属于低温(132.3~243.0℃)、低盐度(0.35~15.86wt%)、中等密度(0.8562~1.004g/cm3)。成矿深度为浅成(1.57km);成矿流体主要是大气降水接触地壳深部上升的岩浆形成的热液。通过流体包裹体获取的信息可以确定晴隆大厂锑矿属浅成低温热液矿床。
[Abstract]:Qinglong Dachang Antimony Mine is located in Dachang Town, Qinglong County, Guizhou Province. The tectonic position is located in the South China Southeast Asia plate, near the eastern side of the two major global tectonic domains of Tethys Himalaya and the Pacific Ocean. The geotectonic position is very special and belongs to the inner category of the continental plate. Previous studies on the geological characteristics, occurrence forms, geochemical characteristics and genesis of antimony deposits in the Dachang antimony deposit in Qinglong have accumulated a certain amount of research data. The genetic types of ore deposits are classified only by macroscopic geological characteristics, generally speaking, the degree of study is relatively weak. Especially in the aspect of ore-forming fluids, there is no perfect research on fluid inclusions, but the ore-forming hydrothermal characteristics are closely related to the genesis of the deposits, and the most direct and effective information can be obtained by using the geochemical characteristics of the deposits. The analysis of inclusion characteristics can provide the most valuable evidence for the genetic types of ore deposits. Starting with the microlithology of fluid inclusions in Dachang antimony deposit, this paper focuses on the analysis, testing and calculation of fluid inclusions (homogenization temperature, freezing point, salinity, pressure, ore-forming depth). The composition of fluid inclusions determines the ore-forming hydrothermal types and further establishes the genetic types of the deposits. Based on the detailed field geological investigation and sample classification analysis of Dachang antimony deposit in Qinglong, the geological characteristics and occurrence, scale and quantity of ore bodies are basically understood, and the overall understanding of the deposit is obtained. Microscopically, thin sheet, light sheet and inclusion sheet were studied. The microlithology and mineralogy of thin and light plates were studied by polarizing microscope to understand the mineral symbiotic assemblage and the sequence of mineral formation of the deposit. In this paper, the fluid inclusion temperature and freezing point data of fluid inclusions are obtained by using the cold and hot table to measure the temperature of fluid inclusions, and the information of salinity, pressure, depth, density and so on are calculated, and the ore-forming environment and ore-forming fluid properties of the deposits are obtained. The source of ore-forming fluid, the migration and precipitation of ore-forming materials are discussed. Finally, based on the previous studies on stable isotopes and gas-liquid composition of inclusions, a metallogenic model of Dachang antimony deposit in Qinglong is established. The main results of this paper are as follows: fluid inclusions in the Dachang antimony deposit in Qinglong include gas-liquid two-phase inclusions, pure liquid-phase inclusions, and gas-liquid two-phase inclusions, followed by gas-liquid two-phase inclusions. The complete homogenization temperature and freezing point of gas-liquid two-phase liquid inclusions were measured and the salinity density and pressure of quartz fluid inclusions were calculated by formula and the metallogenic depth was roughly calculated. The ore-forming fluid of Dachang antimony deposit belongs to low temperature (132.3 ~ 243.0 鈩，

本文编号：1987587