南秦岭银洞沟银金矿床矿相学与成矿时代
发布时间：2019-06-10 20:26
【摘要】：湖北银洞沟银金矿床是南秦岭重要的大型银矿床,矿体产于武当群变质火山岩中,受剪切构造控制,矿石类型主要为石英脉型。矿相学研究表明,含银矿物与方铅矿常同脉产出,从早到晚产出的含银矿物分别为银金矿、自然银、辉银矿、辉铜银矿,有从银矿化向铜矿化转变的趋势,反映了成矿流体从早到晚由氧化变为还原。测得与银金矿密切共生的白云母氩-氩坪年龄为231.0±2.0 Ma(MSWD=0.96),反等时线年龄为229.5±1.4 Ma(MSWD=0.73),与前人测得的本区剪切带多硅白云母氩-氩年龄一致,表明成矿作用与区域剪切构造变形有关。
[Abstract]:Yindonggou silver gold deposit in Hubei Province is an important large silver deposit in the South Qinling Mountains. The orebody occurs in the volcanic rocks of Wudang Group and is controlled by shear structure. The ore type is mainly quartz vein type. The metallographic study shows that the silver-bearing minerals are often produced in the same vein as galena, and the silver-bearing minerals produced from morning to evening are silver gold deposits, natural silver, pyroxene and copper-silver deposits, which tend to change from silver mineralization to copper mineralization. It reflects that the ore-forming fluid changes from oxidation to reduction from morning to night. The argon-argon plateau age of Muscovite closely associated with silver gold deposit is 231.0 卤2.0 Ma (MSWD=0.96), and the inverse isochron age is 229.5 卤1.4 Ma (MSWD=0.73), which is consistent with the argon-argon age of polysilicon Muscovite in the shear zone. It is shown that mineralization is related to regional shear structural deformation.
【作者单位】： 北京大学造山带与地壳演化教育部重点实验室;
【基金】：国家自然科学基金项目(批准号:41373043) 全国危机矿山接替资源找矿项目(编号:20089934)
【分类号】：P618.5
[Abstract]:Yindonggou silver gold deposit in Hubei Province is an important large silver deposit in the South Qinling Mountains. The orebody occurs in the volcanic rocks of Wudang Group and is controlled by shear structure. The ore type is mainly quartz vein type. The metallographic study shows that the silver-bearing minerals are often produced in the same vein as galena, and the silver-bearing minerals produced from morning to evening are silver gold deposits, natural silver, pyroxene and copper-silver deposits, which tend to change from silver mineralization to copper mineralization. It reflects that the ore-forming fluid changes from oxidation to reduction from morning to night. The argon-argon plateau age of Muscovite closely associated with silver gold deposit is 231.0 卤2.0 Ma (MSWD=0.96), and the inverse isochron age is 229.5 卤1.4 Ma (MSWD=0.73), which is consistent with the argon-argon age of polysilicon Muscovite in the shear zone. It is shown that mineralization is related to regional shear structural deformation.
【作者单位】： 北京大学造山带与地壳演化教育部重点实验室;
【基金】：国家自然科学基金项目(批准号:41373043) 全国危机矿山接替资源找矿项目(编号:20089934)
【分类号】：P618.5
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