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首页> 外文期刊>Journal of Asian earth sciences >Paleo- to Eoarchean crustal evolution in eastern Hebei, North China Craton: New evidence from SHRIMP U-Pb dating and in-situ Hf isotopic study of detrital zircons from paragneisses
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Paleo- to Eoarchean crustal evolution in eastern Hebei, North China Craton: New evidence from SHRIMP U-Pb dating and in-situ Hf isotopic study of detrital zircons from paragneisses

机译：华北克拉通东部河北东部古近纪至E古代的地壳演化：石RIM属碎屑锆石的SHRIMP U-Pb定年和原位Hf同位素研究的新证据

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摘要

In the Caozhuang complex in eastern Hebei, North China Craton, the Paleo- to Eoarchean crustal evolution was earlier revealed by the preservation of detrital zircon grains older than (or as old as) 3.8 Ga in fuchsite-quartzite. In order to test if the Eoarchean antiquity is also preserved in rocks other than the fuchsite quartzite, we collected two paragneisses, a hornblende gneiss and a garnet-biotite gneiss, from Huangbaiyu village and dated their detrital zircon grains. The zircon dating of the hornblende gneiss yielded concordant ~(207)Pb/~(205)Pb ages ranging from 3684 to 3354 Ma. However, an older date of 3782 Ma with 18% discordancy was also obtained. Detrital zircon grains from the garnet-biotite gneiss gave a similar ~(207)Pb/~(205)Pb age range, from 3838 to 3342 Ma. The metamorphic domains of the zircon grains from both samples, including the strongly recrystallized cores and rims, recorded an overprinting metamorphism at ca. 2.5 Ga, which correlates with the most widespread tectono-thermal event in the North China Craton. In situ zircon Hf-isotope analyses on the dated zircon grains yielded a wide range of model ages (T_(DMI)) from 4.0 to 3.3 Ga with corresponding ε_(Hf(T)) from -36.0 to +4.8. This suggests that the evolution of the crustal segment in this area has involved multiple phases of juvenile crustal addition as well as recycling of older crustal rocks. The new geochronological results imply the presence of a significant amount of Eoarchean crustal fragments in the eastern Hebei area. The sedimentary protoliths of the paragneisses and other high-grade metamorphic rocks in the Caozhuang complex were probably deposited between 3.4 and 2.5 Ga.
机译：在华北克拉通河北东部的曹庄综合体中，古到地壳的地壳演化最早是通过在铁橄榄石-石英岩中保存了年龄大于（或等于3.8 Ga）的碎屑锆石颗粒而揭示的。为了测试是否在远古石英岩以外的岩石中也保存了古代欧陶统，我们从黄柏yu村收集了两个石agne，一个角闪石片麻岩和一个石榴石-黑云母片麻岩，并标出了其碎锆石的年代。角闪片麻岩的锆石测年产生的〜（207）Pb /〜（205）Pb年龄从3684至3354 Ma不等。但是，还获得了3782 Ma的较早日期，其中18％的不一致。石榴石-黑云母片麻岩中的碎屑锆石晶粒年龄相似，约为（207）Pb /〜（205）Pb，年龄范围为3838-3334 Ma。两种样品中锆石晶粒的变质域，包括强烈重结晶的核和边缘，都记录了一个约40℃的叠印变质作用。 2.5 Ga，与华北克拉通最普遍的构造热事件有关。对过时的锆石进行原位锆石Hf同位素分析得到了4.0到3.3 Ga的较宽模型年龄（T_（DMI）），相应的ε_（Hf（T））则从-36.0到+4.8。这表明该地区地壳部分的演化涉及到幼年地壳添加的多个阶段以及旧地壳岩石的回收。新的年代学结果表明，河北东部地区存在大量的欧陶纪地壳碎片。草庄岩体中的连石和其他高级变质岩的沉积原岩可能沉积在3.4和2.5 Ga之间。

著录项

  • 来源
    《Journal of Asian earth sciences》 |2013年第15期|4-17|共14页
  • 作者

    Shoujie Liu; Yusheng Wan; Huiyi Sun; Allen P. Nutman; Hangqiang Xie; Chunyan Dong; Mingzhu Ma; Dunyi Liu; Bor-ming Jahn;

  • 作者单位

    Institute of Geology, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, China,Department of Geosciences, National Taiwan University, Taipei, Taiwan;

    Institute of Geology, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, China;

    Institute of Geology, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, China;

    School of Earth & Environmental Sciences, University of Wollongong, Wollongong, NSW 2522, Australia;

    Institute of Geology, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, China;

    Institute of Geology, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, China;

    Institute of Geology, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, China;

    Institute of Geology, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, China;

    Department of Geosciences, National Taiwan University, Taipei, Taiwan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Detrital zircon; Eoarchean; SHRIMP dating; Hf-isotopes; Eastern Hebei; North China Craton;

    机译：碎屑锆石;骨虾约会;同位素河北东部;华北克拉通;

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