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

被引:46
作者
郭丽爽
刘树文
刘玉琳
田伟
余盛强
李秋根
吕勇军
机构
[1] 北京大学造山带与地壳演化教育部重点实验室
关键词
涑水杂岩; 花岗质片麻岩; SHRIMP锆石年代学; 锆石Hf同位素; 岩石成因; 形成环境;
D O I
暂无
中图分类号
P597.3 [];
学科分类号
070902 ;
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。前寒武纪涑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。
引用
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页码:139 / 148
页数:10
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