龙泉关剪切带眼球状花岗质片麻岩锆石U-Pb年代学和Lu-Hf同位素特征及其地质意义
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  • 英文篇名:Zircon U-Pb age and Lu-Hf isotope characteristics of the granitic augen gneiss from the Longquanguan shear zone,and their geological significance
  • 作者:王盟 ; 钱加慧 ; 张进江 ; 张波
  • 英文作者:WANG Meng;QIAN Jiahui;ZHANG Jinjiang;ZHANG Bo;School of Earth Science and Resources,Chang'an University;School of Earth and Space Sciences,Peking University;School of Earth Sciences and Engineering,Sun Yat-sen University;
  • 关键词:锆石U-Pb年龄 ; Hf同位素 ; 龙泉关剪切带 ; 华北克拉通
  • 英文关键词:zircon U-Pb age;;Hf isotope;;Longquanguan shear zone;;North China Craton
  • 中文刊名:DXQY
  • 英文刊名:Earth Science Frontiers
  • 机构:长安大学地球科学与资源学院;北京大学地球与空间科学学院;中山大学地球科学与工程学院;
  • 出版日期:2019-02-26 08:57
  • 出版单位:地学前缘
  • 年:2019
  • 期:v.26;No.137
  • 基金:国家自然科学基金项目(41602048,41430207);; 中国博士后基金项目(2016M592726,2016M592566,2017T100650)
  • 语种:中文;
  • 页:DXQY201903025
  • 页数:12
  • CN:03
  • ISSN:11-3370/P
  • 分类号:179-190
摘要
恒山五台阜平地区地处华北克拉通中部造山带的中段,早前寒武纪地体出露较好,是解析华北克拉通早前寒武纪演化过程的最佳地段。龙泉关剪切带位于五台杂岩和阜平杂岩的交接部位,其主要岩石类型为眼球状花岗质片麻岩、变粒岩和斜长角闪岩。本文利用LA-ICP-MS方法对龙泉关剪切带中的眼球状花岗质片麻岩进行了锆石U-Pb年龄和Lu-Hf同位素的测试。结果显示,龙泉关眼球状花岗质片麻岩原岩结晶年龄为(2 547±7)Ma,其εHf(t)值介于+2.7~+9.2,表明其源区主要为相对年轻的地壳物质,与五台地区新太古代花岗岩非常相似。龙泉关花岗质眼球状片麻岩中锆石两阶段Hf模式年龄(TDM2)为2 477~2 872 Ma,具有2.58Ga、2.71Ga和2.81Ga三个峰值,记录了华北克拉通新太古代初始地壳生长事件。
        The Hengshan-Wutai-Fuping area,located in the middle part of the Trans-North China Orogen with large outcrop of Precambrian rocks,is becoming an ideal place to reveal the early-phase evolutionary history of the North China Craton.The Longquanguan shear zone situated in the junction area of the Wutai and Fuping Complex,and the main rock types are granitic augen gneiss and amphibolite.We conducted LAICP-MS zircon U-Pb dating and Lu-Hf isotope analysis for the granitic aguen gneiss from the Longquanguan shear zone.The protolith of the Longquanguan granitic aguen gneiss was crystallized at 2547±7 Ma,withεHf(t)values from +2.7 to+9.2,indicating that the rocks were derived from relatively juvenile continental crust with similar features of the late Archean granitic rocks from the Wutai complex.According to the twostage Hf model,the zircon ages from the Longquanguan granitic augen gneiss varied from 2872 to 2477 Ma and peaked at 2.58 Ga,2.71 Ga and 2.81 Ga,coinciding with the Neoarchean continental crustal growth events of the North China Craton.
引文
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