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地质论评  2004 

山东沂水太古宙蔡峪和大山岩体SHRIMP锆石年代学

Keywords: 锆石太古宙SHRIMP年代学

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Abstract:

本文首次报道了山东沂水蔡峪岩体和大山岩体锆石SHRIMP测年结果。结果显示,蔡峪岩体的侵位(或结晶)年龄为2562±14Ma(12个点的~(207)Pb/~(206)Pb年龄平均值,95%置信度误差,下同),MSWD=4.5;大山岩体的侵位(或结晶)年龄为2545±10Ma(10个点),MSWD=6.1。两个岩体的岩相学、岩石化学和地球化学有所差别,但都属于该区同一岩体群,时代为新太古代。蔡峪岩体和大山岩体变质年龄分别为2518±13Ma和2508±5Ma,它们曾分别遭受过麻粒岩相和角闪岩相变质作用,对应的是太古宙末期一次重要的变质构造事件。两个岩体中均含有数量不等、时代不同的古老残余锆石,其中在蔡峪岩体中获得2.64~2.69Ga、2.70Ga、2.82Ga、2.93Ga和3.07Ga5组年龄,在大山岩体的残留锆石中获得2.63~2.67Ga和2.82Ga两组年龄。2.93Ga和3.07Ga古老残余锆石的发现,进一步证明本区确有中太古亩地体的存在,这对探讨本区太古宙地壳演化具有重要意义。

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