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矿床地质  2005 

甘肃省阳山金矿床石英脉中锆石SHRIMPU-Pb年代学研究

Keywords: 地球化学,微细浸染型,金矿床,锆石,SHRIMP年龄,阴极发光,甘肃

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Abstract:

为研究阳山特大微细浸染型金矿床的成矿时代,文章结合阴极发光对矿区不同类型石英(细)脉中锆石进行了SHRIMPU_Pb年龄的精确测定。结果表明,微细浸染型矿石中锆石呈自形柱状,韵律性环带结构发育,Th/U比值集中于0.5~1.5之间,具岩浆岩锆石特征,锆石206Pb/238U年龄有3组,分别为(197.6±1.7)Ma、(126.9±3.2)Ma和(51.2±1.3)Ma,其中前一组年龄与矿区斜长花岗斑岩脉的形成时代一致,而后两组年龄指示矿区存在白垩纪及第三纪隐伏岩浆岩体,表明阳山微细浸染型金矿床的形成与中、新生代3次岩浆热液活动有关。矿区含明金石英脉型矿石中所测得的锆石年龄均老于围岩时代。不同时代多期次热液活动在空间上的耦合是形成阳山金矿床的重要因素。

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