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首页> 外文期刊>Journal of Asian earth sciences >Evolution of the Yunkai Terrane, South China: Evidence from SHRIMP zircon U-Pb dating, geochemistry and Nd isotope
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Evolution of the Yunkai Terrane, South China: Evidence from SHRIMP zircon U-Pb dating, geochemistry and Nd isotope

机译：中国南方云海地带的演化：来自SHRIMP锆石U-Pb定年，地球化学和Nd同位素的证据

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摘要

The Yunkai Terrane is one of the most important pre-Devonian areas of metamorphosed supracrustal and granitic basement rocks in the Cathaysia Block of South China. The supracrustal rocks are mainly schist, slate and phyllite, with local paragneiss, granulite, amphibolite and marble, with metamorphic grades ranging from greenschist to granulite facies. Largely on the basis of metamorphic grade, they were previously divided into the Palaeo- to Mesoproterozoic Gaozhou Complex, the early Neoproterozoic Yunkai 'Group' and early Palaeozoic sediments. Granitic rocks were considered to be Meso- and Neoproterozoic, or early Palaeozoic in age. In this study, four meta-sedimentary rock samples, two each from the Yunkai 'Group' and Gaozhou Complex, together with three granite samples, record metamorphic and magmatic zircon ages of 443-430 Ma (Silurian), with many inherited and detrital zircons with the ages mainly ranging from 1.1 to 0.8 Ga, although zircons with Archaean and Palaeoproterozoic ages have also been identified in several of the samples. A high-grade sillimanite-garnet-cordierite gneiss contains ～242 Ma metamorphic zircons, as well as ～440 Ma ones. Three of the meta-sedimentary rocks show large variations in major element compositions, but have similar REE patterns, and have t_(DM) model ages of 2.17-1.91 Ga and ε_(Nd) (440 Ma) values of -13.4 to -10.0. Granites range in composition from monzogranite to syenogranite and record t_(DM) model ages of 2.13-1.42 Ga and E_(Nd) (440 Ma) values of - 8.4 to -1.2. It is concluded that the Yunkai 'Group' and Gaozhou Complex formed coevally in the late Neoproterozoic to early Palaeozoic, probably at the same time as weakly to un-metamorphosed early Palaeozoic sediments in the area. Based on the detrital zircon population, the source area contained Meso- to Neoproterozoic rocks, with some Archaean material. Palaeozoic tectonothermal events and zircon growth in the Yunkai Terrane can be correlated with events of similar age and character known throughout the Cathaysia Block. The lack of evidence for Palaeo- and Mesoproterozoic rocks at Yunkai, as stated in earlier publications, means that revision of the basement geology of Cathaysia is necessary.
机译：Yunkai Terrane是华南地区华夏地块中变质的上地壳和花岗岩基底岩石中最重要的前泥盆纪地区之一。上地壳岩石主要是片岩，板岩和千枚岩，局部有石阶，花岗石，角闪石和大理石，其变质级别从绿片岩到花岗石相。在很大程度上根据变质等级，它们以前被划分为古至中元古代高州复合体，新元古代早期的云开“群”和早古生代沉积物。花岗质岩石被认为是中元古代和新元古代，或早古生代。在这项研究中，四个云系沉积岩样品（分别来自云开“群”和高州综合体中的两个）以及三个花岗岩样品，记录了变质和岩浆锆石的年龄为443-430 Ma（Silurian），并且有许多继承的和碎屑的锆石。年龄主要在1.1至0.8 Ga之间，尽管在一些样本中也发现了具有古生代和古元古代的锆石。高级硅线石-石榴石-堇青石片麻岩中含有〜242 Ma的变质锆石，还有〜440 Ma的锆石。三个准沉积岩的主要元素组成变化很大，但具有相似的REE模式，t_（DM）模型年龄为2.17-1.91 Ga，ε_（Nd）（440 Ma）值为-13.4至-10.0 。花岗岩的组成范围从辉长花岗岩到正长花岗岩，记录的t_（DM）模型年龄为2.13-1.42 Ga，E_（Nd）（440 Ma）值介于-8.4至-1.2。结论是，云开“群”和高州复合体在新元古代晚期至古生代早期形成，可能与该地区的弱，未变质的早古生代沉积物同时形成。根据碎屑锆石的数量，震源区包含中元至新元古代的岩石，并含一些古生的物质。 Yunkai Terrane中的古生代构造热事件和锆石的生长可能与整个华夏地块已知的类似年龄和特征的事件有关。如早先的出版物所述，缺乏云凯古生代和中元古代岩石的证据，这意味着有必要对华夏的地下地质进行修订。

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  • 来源
    《Journal of Asian earth sciences》 |2010年第2期|140-153|共14页
  • 作者

    Yusheng Wan; Dunyi Liu; Simon A. Wilde; Jianjin Cao; Bin Chen; Chunyan Dong; Biao Song; Lilin Du;

  • 作者单位

    Institute of Geology, Chinese Academy of Geological Sciences, 26 Baiwanzhuang, Beijing 100037, China Beijing SHRIMP Center, Beijing 100037, China Department of Applied Geology, Curtin University of Technology, Perth, Western Australia 6845, Australia;

    Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China Beijing SHRIMP Center, Beijing 100037, China;

    Department of Applied Geology, Curtin University of Technology, Perth, Western Australia 6845, Australia;

    Department of Earth Sciences, Sun Vat-sen University, Guangzhou 510275, China;

    Peking University, Beijing 100871, China;

    Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China Beijing SHRIMP Center, Beijing 100037, China;

    Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China Beijing SHRIMP Center, Beijing 100037, China;

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

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  • 正文语种 eng
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  • 关键词

    yunkai area; South China; SHRIMP U-Pb zircon dating; Nd isotopes; palaeozoic (caledonian) orogen; basement granitoids;

    机译：云开地区华南SHRIMP U-Pb锆石约会;钕同位素;古生代（古苏格兰）造山带;地下花岗岩;

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