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首页> 外文期刊>Journal of Asian earth sciences >Provenance and tectonic setting of the supra-crustal succession of the Qinling Complex: Implications for the tectonic affinity of the North Qinling Belt, Central China
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Provenance and tectonic setting of the supra-crustal succession of the Qinling Complex: Implications for the tectonic affinity of the North Qinling Belt, Central China

机译：秦岭复杂地壳演替的物源和构造环境：对华北秦岭带构造亲和力的启示

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摘要

The Qinling Complex lies in the Qinling orogenic belt of Central China and holds the key to understanding the evolution of this feature. The Qinling Complex comprises a basement complex composed of amphibolite and ecologite, overlain by a supra-crustal succession that has been metamorphosed to the upper greenschist facies at approximately 516-509 Ma. The protoliths of the meta-sedimentary rocks are graywackes, which are divided into lower, middle and upper units. Detrital zircons from nine samples of the supra-crustal succession have ages ranging from 1182 to 1158 Ma for the lower unit, 957 to 955 Ma for the middle unit and 917 to 840 Ma for the upper unit. The lower unit is intruded by a ca. 960 Ma pluton. The bulk compositions of these mew-sedimentary rocks and their detrital zircon ages clearly indicate derivation from Meso- and Neo-proterozoic granites. Thus, we suggest that the sedimentary succession was derived from an arc-related tectonic setting and that none of the detritus was sourced from the southern margin of the North China Block or from the northern and western margins of the South China Block. We conclude that the North Qinling Belt was an independent micro-continental block during the Meso- to Neo-proterozoic.
机译：秦岭综合体位于中国中部的秦岭造山带，是理解这一特征演变的关键。秦岭综合体包括由闪石和榴辉岩组成的地下复合体，上面覆盖着超地壳演替，并已在大约516-509 Ma变质为上部绿片岩相。准沉积岩的原石为灰泥岩，分为下部，中部和上部。来自上地壳演替的九个样品的碎屑锆石的年龄范围在下部单元为1182至1158 Ma，中部单元为957至955 Ma，上部单元为917至840 Ma。下部单元由ca插入。 960毫安这些近泥质沉积岩的大块成分及其碎屑锆石年龄清楚地表明其来源于中元古代和新元古代的花岗岩。因此，我们认为沉积演替是从与弧有关的构造环境中衍生出来的，而碎屑均没有来自华北地块的南部边缘或华南地块的北部和西部边缘。我们得出的结论是，北秦岭带是中元至新元古代的一个独立的微大陆块。

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  • 来源
    《Journal of Asian earth sciences》 |2018年第1期|112-139|共28页
  • 作者

    Shi Yu; Huang Qianwen; Liu Xijun; Krapez Bryan; Yu Jinhai; Bai Zhian;

  • 作者单位

    Guilin Univ Technol, Collaborat Innovat Ctr Explorat Hidden Nonferrous, Guilin 541004, Guangxi, Peoples R China;

    Guilin Univ Technol, Collaborat Innovat Ctr Explorat Hidden Nonferrous, Guilin 541004, Guangxi, Peoples R China;

    Guilin Univ Technol, Collaborat Innovat Ctr Explorat Hidden Nonferrous, Guilin 541004, Guangxi, Peoples R China;

    Guilin Univ Technol, Sch Earth Sci, Guilin 541004, Guangxi, Peoples R China;

    Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing 210093, Jiangsu, Peoples R China;

    Guilin Univ Technol, Collaborat Innovat Ctr Explorat Hidden Nonferrous, Guilin 541004, Guangxi, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Meta-sedimentary rocks; Qinling Complex; Grenvillian; Arc-related tectonic setting; Micro-continental block;

    机译：准沉积岩秦岭群格里维利安弧相关构造环境微洲块体;

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