中条山涑水杂岩中TTG片麻岩的锆石Hf同位素特征及其形成环境
Zircon Hf isotopic features of TTG gneisses and formation environment of Precambrian Sushui complex in Zhongtiao mountains
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摘要: 中条山前寒武纪涑水杂岩主要由西姚和寨子英云闪长质-奥长花岗质-花岗闪长质(TTG)片麻岩、横岭关和北峪钙碱性花岗质岩石组成.SHRIMP锆石U-Pb年代学研究表明,西姚石英闪长质片麻岩207Pb/206Pb加权平均年龄为2536±8Ma,是新太古代的产物;西姚和寨子TTG片麻岩及横岭关和北峪钙碱性花岗质岩石岩浆锆石Hf同位素组成εHf(t)全为正值,且在t-εHf(t)图解上,落在2.6～3.1Ga地壳演化线范围内.北峪钙碱性花岗质岩石中三个继承锆石核的207Pb/206Pb加权平均年龄为2633±84Ma,其锆石εHf(t)值为-2.0～ 5.6.前寒武纪涞水杂岩中花岗质岩石的SHRIMP锆石U-Pb年代学和锆石Hf同位素特征揭示它们最可能形成于新太古代到古元古代,岩浆主要来源于约2650Ma初生地壳的部分熔融,并有更古老的地壳物质的加入.
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