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海南二甲金矿的动力变形成矿作用及构造地球化学模拟实验研究

, PP. 320-329

Keywords: 韧性剪切带,构造岩流体,构造地球化学模拟试验,压溶作用

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Abstract:

海南二甲金矿是一个与戈枕韧性剪切带活动明显相关的金矿床。利用构造地球化学方法和构造地球化学模拟试验,研究了戈枕韧性剪切活动与金成矿的关系,结果显示:动力变形作用不仅导致混合岩发生明显的糜棱岩化,而且使矿物成分、化学成分发生明显变化,同时伴随着一定的构造岩流体活动。动力变形中岩石的变形机制可发现有多种,其中以恢复作用比较有利于糜棱岩中金的富集;由动态重结晶石英颗粒统计的差异古应力显示变形强度与Au富集有显著的正相关性,相关系数达+0.5928。动力变形不同阶段形成的石英矿物其微量元素含量明显不同,石英中流体包裹体的成分也有明显的差异,反映出不同动力变形阶段流体活动的差异性与金富集密切相关。构造地球化学模拟试验表明,变形作用不仅导致岩石组构的变化,形成微型剪切带、碎粒流带等流动构造,而且伴随有明显的流体活动。这些过程与压溶作用密切相关;另外,动力作用中伴随着金的沉淀、富集,这其中Si、Fe组分起了重要的作用。

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