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Origin and tectonic significance of the Huangling massif within the Yangtze craton, South China

机译：中国南方扬子克拉通内黄陵地块的成因及构造意义

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摘要

As the oldest exposed basement and the typical sedimentary cover of the Yangtze craton, the Huangling massif is a suitable place to decipher the tectonics of South China block. Structural analysis shows that the Huangling massif has an elliptic domal shape with N-S striking long axis, an asymmetric antiform with a steep western flank and a gentle eastern flank. There, three litho-tectonic units are recognized, from inner to outer parts: (1) Archean-Paleoproterozoic metamorphic rocks intruded by Neoproterozoic granitoids; (2) Neoproterozoic to Jurassic sedimentary envelope around the dome core; (3) Cretaceous terrigeneous alluvial-fluvial deposits, unconformably overlying the dome flanks. Coeval with the uplifting of the massif, the pre-Cretaceous strata on the western and eastern flanks of the Huangling massif were involved in a series of folds with nearly N-S axes and layer-parallel slip structures with top-to-the-W and top-to-the-E motion, respectively. The subsequent brittle normal faulting controlled the deposition of the graben or half-graben basins on both flanks. Cooling history reveals that the Huangling massif underwent uplifting between 160 Ma and 110 Ma with an average cooling rate of 2-3 ℃/Ma. Moreover, the Huangling area was not significantly affected by the Early Paleozoic and Trias-sic orogenies of South China. Comparable with the contemporaneous extensional structures, such as metamorphic core complexs, syntectonic plutons bounded by ductile normal faults, and rift-related basins in eastern China, it is proposed that the Huangling massif, might be an extensional structure controlled by a weak crustal extension. In this case, it will represent the western front of the Late Mesozoic lithospheric thinning in entire eastern China. However the compressional model cannot be ruled out.
机译：作为长江克拉通最古老的裸露地下室和典型的沉积覆盖层，黄陵地块是解读华南地块构造的合适场所。结构分析表明，黄陵断层呈椭圆形，长轴呈N-S形，不对称反型，具有陡峭的西侧和缓和的东侧。在那里，从内部到外部，共识别出三个岩石构造单元：（1）新元古代花岗岩侵入的太古宙古生代变质岩； （2）穹顶核心周围的新元古代至侏罗纪沉积包膜； （3）白垩纪陆相冲积河流相沉积物，不均匀地覆盖在穹顶侧面。随着地块的抬升，黄陵地块西部和东部两侧的白垩纪前地层参与了一系列的褶皱，这些褶皱具有近乎NS的轴以及层顶滑到顶部和顶部平行的滑动结构到E的运动。随后的脆性正断层控制了两侧面的grab陷或半盆盆的沉积。降温历史表明，黄陵地块在160Ma至110Ma之间经历隆升，平均降温速度为2-3℃/ Ma。而且，黄陵地区并没有受到华南早期古生代和三叠纪造山运动的明显影响。与中国东部的变质岩心复合体，以延性正断层为界的构造构造岩体以及与裂谷有关的盆地等同期的伸展构造相比，黄陵地块可能是由弱地壳伸展控制的伸展构造。在这种情况下，它将代表整个中国东部中生代晚期岩石圈变薄的西部锋面。但是，不能排除压缩模型。

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  • 来源
    《Journal of Asian earth sciences》 |2014年第1期|59-75|共17页
  • 作者

    Wenbin Ji; Wei Lin; Michel Faure; Yang Chu; Lin Wu; Fei Wang; Jun Wang; Qingchen Wang;

  • 作者单位

    State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China,University of the Chinese Academy of Sciences, Beijing 100049, China;

    State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;

    Institut des Sciences de la Terre d'Orleans, Universite d'Orleans-CNRS, 1A rue de la Ferollerie, 45071 Orleans, France;

    State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;

    State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China,University of the Chinese Academy of Sciences, Beijing 100049, China;

    State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;

    State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China,University of the Chinese Academy of Sciences, Beijing 100049, China;

    State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;

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  • 正文语种 eng
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  • 关键词

    Huangling massif; Structural analysis; Cooling and uplifting history; Late Mesozoic tectonics; South China;

    机译：黄陵地块;结构分析;降温和抬高历史;中生代晚期构造华南;

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