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中文摘要：
对西大别红安地区超高压榴辉岩中石英脉的锆石进行了U-Pb年代学和Hf同位素组成的研究.结果提供了超高压变质岩石折返阶段流体活动的时间、条件和流体来源等方面的信息.石英脉中的锆石具有非常完好的晶型,振荡环带或弱分带结构,表明它们是从石英脉形成过程中的流体中结晶出来的.它们的206Pb/238U加权平均年龄为（224.7±1.3）Ma,是石英脉形成时间的最佳估计值,记录了超高压岩石早期榴辉岩相折返阶段流体的活动.热液锆石具有非常低的Lu/Hf同位素比值,与它们形成于榴辉岩相变质作用阶段相一致.这些锆石的Hf同位素组成与寄主榴辉岩中的锆石一致,指示石英脉形成过程中只有小规模的流体活动,流体为内部来源.因此,热液锆石的Lu-Hf同位素体系可以为流体的形成条件、性质以及来源提供有效的制约.
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