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首页> 外文期刊>Journal of Asian earth sciences >Geochronology and isotope analysis of the Late Paleozoic to Mesozoic granitoids from northeastern Vietnam and implications for the evolution of the South China block
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Geochronology and isotope analysis of the Late Paleozoic to Mesozoic granitoids from northeastern Vietnam and implications for the evolution of the South China block

机译：越南东北部晚古生代至中生代花岗岩的年代学和同位素分析及其对华南地块演化的启示

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摘要

In northeastern Vietnam, Late Paleozoic and Permo-Triassic granitic plutons are widespread, but their tectonic significance is controversial. In order to understand the regional magmatism and crustal evolution processes of the South China block (SCB), this study reports integrated in situ U-Pb, Hf-O and Sr-Nd isotope analyses of granitic rocks from five plutons in northeastern Vietnam. Zircon SIMS U-Pb ages of six granitic samples cluster around in two groups 255-228 Ma and 90 Ma. Bulk-rock ε_(Nd) (t) ranges from -11 to -9.7, suggesting that continental crust materials were involved in their granitic genesis. In situ zircon Hf-O isotopic measurements for the granitic samples yield a mixing trend between the mantle- and supracrustal-derived melts. It is suggested that the granitic rocks were formed by re-melting of the continental crust. These new data are compared with the Paleozoic and Mesozoic granitic rocks of South China. We argue that northeastern Vietnam belongs to the South China block. Though still speculated, an ophiolitic suture between NE Vietnam and South China, so-called Babu ophiolite, appears unlikely. The Late Paleozoic to Mesozoic magmatism in the research area provides new insights for the magmatic evolution of the South China block.
机译：在越南东北部，晚古生代和二叠纪-三叠纪花岗岩体广泛存在，但其构造意义尚存争议。为了了解华南地块（SCB）的区域岩浆作用和地壳演化过程，本研究报告了越南东北部五个俯冲体花岗岩岩石的原位U-Pb，Hf-O和Sr-Nd同位素综合分析。六个花岗岩样品的Zircon SIMS U-Pb年龄聚集在255-228 Ma和90 Ma的两组中。块岩的ε_（Nd）（t）范围为-11至-9.7，表明大陆地壳物质参与了其花岗岩的成因。花岗岩样品的原位锆石Hf-O同位素测量在地幔和上壳壳熔体之间产生混合趋势。建议花岗质岩石是通过大陆壳的再熔融形成的。将这些新数据与中国南方的古生代和中生代花岗岩进行了比较。我们认为越南东北部属于华南地块。尽管仍被推测，但越南东北部和华南之间的卵石缝合线（所谓的巴布蛇绿岩）似乎不太可能。研究区的晚古生代至中生代岩浆作用为华南地块的岩浆演化提供了新的见解。

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  • 来源
    《Journal of Asian earth sciences》 |2014年第1期|131-150|共20页
  • 作者

    Zechao Chen; Wei Lin; Michel Faure; Claude Lepvrier; Nguyen Van Vuong; Vu Van Tich;

  • 作者单位

    State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China,Graduate University of Chinese Academy of Sciences, Beijing 100049, China;

    State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China,Institute of Geology and Geophysics, Chinese Academy of Sciences, 19 Beitucheng Western Road, Chaoyang District 100029, China;

    Institut des Sciences de la Terre d'Orlieans (ISTO), UMR CNRS 6113, Universite d'Orleans, 45067 Orleans Cedex 2, France;

    Institut des Sciences de la Terre de Paris (ISTeP), UMR CNRS 7193, Case 129, Universite Pierre & Marie Curie, 4 Place Jussieu, 75252 Paris Cedex 05, France;

    Faculty of Geology, Hanoi University of Science, 334 Nguyen Trai, Thanh Xuan, Hanoi, Viet Nam;

    Faculty of Geology, Hanoi University of Science, 334 Nguyen Trai, Thanh Xuan, Hanoi, Viet Nam;

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  • 正文语种 eng
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  • 关键词

    Northeastern Vietnam; South China block; Triassic orogen; Zircon SIMS dating; Hf-O isotopes; Eastern Paleotethys;

    机译：越南东北部;华南地块;三叠纪造山带;锆石SIMS约会;Hf-O同位素;东方古生物;

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