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地质学报  2007 

金红石Zr温度计在苏鲁-大别榴辉岩研究中的应用:问题讨论

, PP. 1369-1377

Keywords: 金红石Zr温度计,苏鲁-大别榴辉岩,退变质流体,扩散丢失,再平衡

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Abstract:

金红石Zr含量温度计在苏鲁-大别超高压榴辉岩中的应用普遍得出了比峰期变质温度明显偏低的温度值。通过对比国内外的研究,并结合岩相学的分析,认为除了超高压可能使金红石对Zr的容纳度降低外,较强的退变质和流体作用下的扩散丢失是造成金红石Zr含量降低的主要原因。同一样品不同金红石颗粒之间Zr含量和温度的显著差别说明金红石与共存锆石和石英之间的Zr配分平衡已受到退变质作用的破坏且未能达到再平衡,金红石Zr含量温度代表的是每个颗粒受不同程度退变质和扩散影响后的某个缓冲状态,其平均温度的地质意义很难界定。只有将金红石的赋存状态、岩相学分析等研究与数据本身的均匀性分析结合起来进行综合判断,才有可能对金红石Zr温度计给出合理解释。

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