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首页> 外文期刊>Journal of Asian earth sciences >The formation and rejuvenation of continental crust in the central North China Craton: Evidence from zircon U-Pb geochronology and Hf isotope
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The formation and rejuvenation of continental crust in the central North China Craton: Evidence from zircon U-Pb geochronology and Hf isotope

机译：华北克拉通中部大陆壳的形成与活化：锆石U-Pb年代学和H同位素的证据

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摘要

The Trans-North China Orogen (TNCO) along the central part of the North China Craton (NCC) is considered as a Paleoproterozoic suture along which the Eastern and Western Blocks of the NCC were amalgamated. Here we investigate the Precambrian crustal evolution history in the Fuping segment of the TNCO and the subsequent reactivation associated with extensive craton destruction during Mesozoic. We present zircon LA-ICP-MS U-Pb and Lu-Hf data on TTG (tonalite-trondhjemite-granodiorite) gneiss, felsic orthogneiss, amphibolite and granite from the Paleoproterozoic suite which show magmatic ages in the range of 2450-1900 Ma suggesting a long-lived convergent margin. The ε_(Hf)(t) values of these zircons range from -11.9 to 12 and their model ages suggest magma derivation from both juvenile components and reworked Archean crust. The Mesozoic magmatic units in the Fuping area includes granite, diorite and mafic microgranular enclaves, the zircons from which define a tight range of 120-130 Ma ages suggesting a prominent Early Cretaceous magmatic event. However, the ε_(Hf)(t) values of these zircons show wide a range from -30.3 to 0.2, indicating that the magmatic activity involved extensive rejuvenation of the older continental crust.
机译：华北克拉通（NCC）中部的跨华北造山带（TNCO）被认为是古元古代缝线，NCC的东西两段都被合并在一起。在这里，我们调查了TNCO富平段的前寒武纪地壳演化历史，以及随后的与中生代克拉通破坏相关的再活化。我们提供了古元古代套件中TTG（tonalite-trondhjemite-granodiorite）片麻岩，长生斜长片岩，闪石和花岗岩上的锆石LA-ICP-MS U-Pb和Lu-Hf数据，表明岩浆年龄在2450-1900 Ma之间长期的会聚利润率。这些锆石的ε_（Hf）（t）值范围在-11.9至12之间，并且它们的模型年龄表明，岩浆来源于幼年成分和重做的太古宙壳。富平地区的中生代岩浆单元包括花岗岩，闪长岩和镁铁质微粒飞地，锆石从中限定了120-130 Ma的小范围，这表明白垩纪是一次重要的岩浆事件。但是，这些锆石的ε_（Hf）（t）值显示出从-30.3到0.2的宽范围，这表明岩浆活动涉及到较旧大陆壳的广泛复兴。

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  • 来源
    《Journal of Asian earth sciences》 |2014年第1期|17-32|共16页
  • 作者

    Qing Li; M. Santosh; Sheng-Rong Li; Pu Guo;

  • 作者单位

    State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, 29 Xueyuan Road, Beijing 100083, China,School of Earth Science and Resources, China University of Geosciences, 29 Xueyuan Road, Beijing 100083, China;

    School of Earth Science and Resources, China University of Geosciences, 29 Xueyuan Road, Beijing 100083, China,Department of Geology, Northwest University, Xi'an 710069, China;

    State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, 29 Xueyuan Road, Beijing 100083, China,School of Earth Science and Resources, China University of Geosciences, 29 Xueyuan Road, Beijing 100083, China;

    State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, 29 Xueyuan Road, Beijing 100083, China,School of Earth Science and Resources, China University of Geosciences, 29 Xueyuan Road, Beijing 100083, China;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    Zircon U-Pb geochronology; Lu-Hf isotopes; Trans-North China Orogen; Mesozoic magmatism; Crustal reworking;

    机译：锆石U-Pb年代学;--f同位素跨华北造山带;中生代岩浆作用;地壳返工;

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