贵州铜仁塘边铅锌矿床成矿时代和成矿物质来源——来自Rb-Sr同位素测年和S-Pb同位素的证据

发布时间：2018-03-08 13:36

  本文选题：Rb-Sr定年　切入点：S-Pb同位素　出处：《地质通报》2017年05期 　论文类型：期刊论文

【摘要】：对贵州铜仁塘边铅锌矿床开展闪锌矿Rb-Sr测年和黄铁矿、方铅矿、闪锌矿S、Pb同位素分析,以获得矿区的成矿年龄,探讨其成矿物质来源。塘边铅锌矿床闪锌矿Rb-Sr等时线年龄为477±5Ma(MSWD=1.2),与前人获得的卜口场矿区闪锌矿Rb-Sr等时线年龄486±6Ma在误差范围内一致,表明矿床形成于加里东早期。黄铁矿、方铅矿、闪锌矿S同位素变化于+25.2‰~+36.1‰之间,与湘西—黔东主要铅锌矿床相似,明显富集重硫,认为S可能来源于寒武系海水碳酸盐和/或下伏地层。方铅矿、闪锌矿Pb同位素~(208)Pb/~(204)Pb值为38.389~38.584,~(207)Pb/~(204)Pb值为15.737~15.790,206Pb/~(204)Pb值为18.181~18.217,μ值为9.75~9.86,显示铅主要来源于上地壳。
[Abstract]:Rb-Sr dating of sphalerite and isotopic analysis of pyrite galena sphalerite and sphalerite in Tongren Tangbian lead-zinc deposit Guizhou Province were carried out in order to obtain the metallogenic age of the deposit. The Rb-Sr isochron age of sphalerite in Tangbian lead-zinc deposit is 477 卤5 Ma, which is consistent with the Rb-Sr isochron age of sphalerite obtained by predecessors at 486 卤6 Ma, indicating that the deposit was formed in early Caledonian pyrite. The S isotopic variation of galena and sphalerite ranges from 25.2 鈥，

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