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矿床地质  2011 

矿物流体包裹体中稀有气体的保存能力初探

Keywords: 地球化学,流体包裹体,矿物,稀有气体,保存能力

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Abstract:

查明流体包裹体中稀有气体的保存能力,对于判断其初始组分特征是否因后生作用而发生改变具有重要意义。文章以Ar为例,从扩散动力学角度对稀有气体地球化学研究中常用的矿物中流体包裹体稀有气体的保存能力进行了定量分析和系统比较,计算了Ar在这些矿物中的封闭温度以及不同温度条件下的保存时间,得出相同条件下各矿物对Ar、He等保存能力的大小顺序为:重晶石(天青石)>黄铜矿>黄铁矿>方铅矿>钾盐>闪锌矿>萤石>黑钨矿>白钨矿>绿柱石>方解石>石英,其中石英中Ar的封闭温度对矿物颗粒大小变化十分敏感,它会随着晶体颗粒半径的增大而迅速提高,但其扩散速率受温度变化的影响相对较小。这为准确评估不同矿物的流体包裹体中稀有气体信息受后生地质作用的影响程度提供了理论依据,有望促进稀有气体同位素地球化学的发展。

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