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矿床地质  2008 

湖北徐家山锑矿床流体包裹体特征及其意义

Keywords: 地球化学,流体包裹体,成矿流体,徐家山锑矿床,湖北

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Abstract:

文章利用激光拉曼光谱和显微测温学方法,对湖北徐家山锑矿床成矿期的石英、重晶石和方解石中的流体包裹体进行了研究。研究表明,这些矿物中的流体包裹体主要有纯液体包裹体和液体包裹体(气相+液相)2类,其液体包裹体的气相成分为H2O±CO2±N2;石英、重晶石和方解石的均一温度分别为134~258℃、154~259℃和145~230℃,主要集中于150~200℃;流体的盐度w(NaCleq)和密度分别集中于3%~6%和0.90~0.96g/cm3。流体包裹体资料揭示出该矿床为典型的中低温热液锑矿床,其成矿流体为中低温、低盐度、中等密度热液。结合H、O、Sr、Pb同位素等研究结果,进一步推断该成矿热液主要是经深部循环演化的大气降水。

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