东秦岭石窑沟斑岩型钼矿成矿流体研究及成矿深度估算
发布时间：2018-10-05 20:49
【摘要】：河南省栾川县石窑沟钼矿床位于东秦岭钼矿带内,是区内新发现的又一典型斑岩型钼矿床。本文在翔实矿床地质特征的基础上,运用矿物岩相学、流体包裹体岩相学,结合激光拉曼扫描光谱分析及稳定同位素等研究,探讨成矿流体成分、温度、盐度、压力等物理化学条件和成矿流体的类型,从成矿流体的“源、运、沉”三个方面研究流体成矿作用并利用流体包裹体压力计法估算成矿深度。石窑沟钼矿床的钼矿化主要呈浸染状、细脉状或网脉状。热液成矿过程分为3个阶段:I)石英+钾长石阶段,II)石英+多金属硫化物阶段,III)石英+方解石阶段。围岩蚀变主要发育有钾化、硅化、绢英岩化、青磐岩化、碳酸盐化等。石窑沟钼矿初始成矿流体为中高温、中低盐度的H2O-Na Cl-CO2体系岩浆热液,热液成矿晚阶段为H2O-Na Cl体系热液。整个成矿流体演化过程中流体包裹体的均一温度、盐度由191.6~437.2℃→191~484℃→132~423℃→117~247℃、2.07~16.45%Na Cleqv→3.55~57.62%Na Cleqv→3.23~50.03%Na Cleqv→2.74~8.95%Na Cleqv,表现出逐步降低的趋势。其中,流体成矿过程中出现不混溶作用造成局部流体盐度升高。H、O同位素组成特征表明,石窑沟钼矿的成矿流体成矿早阶段以岩浆水为主,成矿作用过程中有大气降水的参与。区域稳定同位素及石窑沟钼矿Re同位素特征研究表明,成矿物质来源具有壳幔混源的特征,但主要来自下地壳。成矿元素Mo在成矿流体以中-高温、中-低盐度为特征的石窑沟钼矿中可能主要以离子对(KHMo O4)或钼酸的形式运移;辉钼矿的沉淀主要与流体不混溶、混合作用、物理化学性质的转变有关。利用沸腾包裹法和含子矿物法估算其成矿深度分别为3.7~5.2km、2.81~4.8km。综合本次研究成果及本区其他钼矿床成矿深度的研究,作者认为石窑沟钼矿的成矿深度为3~5km。
[Abstract]:Shiyaogou molybdenum deposit in Luanchuan County Henan Province is located in the East Qinling molybdenum ore belt and is another typical porphyry type molybdenum deposit. On the basis of the geological characteristics of the mineralized ore deposits, this paper discusses the composition, temperature and salinity of ore-forming fluids by means of mineralogical petrography, fluid inclusion petrography, laser Raman scanning spectroscopy and stable isotopic analysis. The physical and chemical conditions such as pressure and the types of ore-forming fluids are studied from the source, transport and sedimentation of the ore-forming fluids, and the depth of ore-forming is estimated by the fluid inclusion pressure gauge method. The molybdenum mineralization of Shiyaogou molybdenum deposit is mainly disseminated, veined or reticulated. The hydrothermal metallogenic process is divided into three stages: I) quartz potassium feldspar stage II) quartz polymetallic sulphide stage III) quartz calcite stage. The main changes of surrounding rock are potassium, silicification, sericolith, Qingiranite, carbonization and so on. The initial ore-forming fluid of Shiyaogou molybdenum deposit is H2O-Na Cl-CO2 system with medium high temperature and low salinity, and the late stage of hydrothermal mineralization is H2O-Na Cl system hydrothermal solution. The homogenization temperature of fluid inclusions and the salinity of fluid inclusions gradually decreased from 191.6 ~ 437.2 鈩，
本文编号：2254827
[Abstract]:Shiyaogou molybdenum deposit in Luanchuan County Henan Province is located in the East Qinling molybdenum ore belt and is another typical porphyry type molybdenum deposit. On the basis of the geological characteristics of the mineralized ore deposits, this paper discusses the composition, temperature and salinity of ore-forming fluids by means of mineralogical petrography, fluid inclusion petrography, laser Raman scanning spectroscopy and stable isotopic analysis. The physical and chemical conditions such as pressure and the types of ore-forming fluids are studied from the source, transport and sedimentation of the ore-forming fluids, and the depth of ore-forming is estimated by the fluid inclusion pressure gauge method. The molybdenum mineralization of Shiyaogou molybdenum deposit is mainly disseminated, veined or reticulated. The hydrothermal metallogenic process is divided into three stages: I) quartz potassium feldspar stage II) quartz polymetallic sulphide stage III) quartz calcite stage. The main changes of surrounding rock are potassium, silicification, sericolith, Qingiranite, carbonization and so on. The initial ore-forming fluid of Shiyaogou molybdenum deposit is H2O-Na Cl-CO2 system with medium high temperature and low salinity, and the late stage of hydrothermal mineralization is H2O-Na Cl system hydrothermal solution. The homogenization temperature of fluid inclusions and the salinity of fluid inclusions gradually decreased from 191.6 ~ 437.2 鈩，
本文编号：2254827
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