豫西熊耳山地区上道回钼矿床地质及流体包裹体研究

发布时间：2018-01-15 19:05

  本文关键词：豫西熊耳山地区上道回钼矿床地质及流体包裹体研究　出处：《现代地质》2016年02期 　论文类型：期刊论文

  更多相关文章： 上道回钼矿 钾长石-石英脉型 地质特征 流体包裹体 熊耳山地区 豫西

【摘要】：上道回钼矿床位于华北克拉通南缘豫西熊耳山—外方山地区,受控于马超营断裂的次级断裂,赋矿地层为中元古界熊耳群中酸性火山岩,矿体呈多组脉状产出。金属矿物以辉钼矿、黄铁矿为主,热液蚀变为硅化、钾长石化、碳酸盐化。热液成矿过程从早到晚为石英-黄铁矿阶段、石英-辉钼矿-多金属硫化物阶段、石英-方解石阶段。包裹体类型为C型(CO2型)、W型(Na Cl-H2O型)、S型(子晶型)。早阶段发育W型、C型和少量S型包裹体,中阶段发育C型、W型、S型包裹体,晚阶段发育W型包裹体。包裹体均一温度为210~390℃、180~300℃、120~220℃,盐度由早阶段1.0%~13.4%和27.2%~33.2%,经中阶段0.3%~14.1%和27.3%~28.5%,到晚阶段0.1%~14.2%。成矿流体由富CO2向贫CO2演化,流体沸腾使CO2等挥发分逃逸,造成流体p H值升高、氧化性降低,从而导致辉钼矿等硫化物沉淀。早、中阶段C型包裹体的捕获压力为148~371 MPa、108~383 MPa,对应的成矿深度为5~14 km。
[Abstract]:The Shangdaohui molybdenum deposit is located in Xiong 'ershan-Waifangshan area of western Henan on the southern margin of North China Craton, controlled by the secondary faults of Machaoying fault and hosted by intermediate-acid volcanic rocks of Xionger Group of the Middle Proterozoic. The orebodies are formed in multiple veins. Molybdenum and pyrite are the main metal minerals, hydrothermal erosion becomes silicification, kalitization and carbonization. The hydrothermal metallogenic process is quartz pyrite stage from early to late. Quartz-molybdenum polymetallic sulfide stage, quartz-calcite stage. The inclusion type is C-type CO _ 2 _ 2 _ (W) _ (Na _ (Cl-H2O)). Type S (subcrystalline type). W type C type and a few S type inclusions are developed in the early stage and C type W type / S type inclusions are developed in the middle stage. W type inclusions are developed in the late stage. The homogenization temperature of inclusions is 210 ~ 390 鈩，

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