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首页> 外文期刊>Journal of Asian earth sciences >Phanerozoic polyorogenic deformation in southern Jiuling Massif, northern South China block: Constraints from structural analysis and geochronology
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Phanerozoic polyorogenic deformation in southern Jiuling Massif, northern South China block: Constraints from structural analysis and geochronology

机译：华南北部九陵地块南部的古生代多造山变形：来自结构分析和年代学的限制

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摘要

The structure of the Jiuling Massif has been investigated in order to delineate the polyorogenic deformation and discuss its geodynamic evolution and orogenic mechanisms. Detailed structural analysis indicates that the D_1 event is characterized by top-to-the NNW ductile shearing with pervasive foliation, and mineral and stretching lineation developed in the entire region. Compared with the D_1 deformation, D_2 structures are localized in ductile shear zones with subvertical foliation and subhorizontal E-W trending lineation, indicating a dextral ductile shearing. The D_3 event, marked by folds and thrusts mainly in a brittle domain, modified the D_1 structures by asymmetrical folds. The dominant D_4 structures are gravitational folds and normal faults, corresponding to a later extension. Our new geochronological data suggest that the D_1 event occurred between 465 and 380 Ma with D_2 dextral shearing at the end of this Early Paleozoic orogen, and the D_3 event has been constrained at 245-215 Ma. The final uplift of the Jiuling Massif by the D_4 event can be correlated with the Late Mesozoic extension across the eastern South China block. Along with previous studies in the South China block, the structural pattern of the Jiuling Massif elucidates the influence of the Early Paleozoic and Early Mesozoic intracontinental belts triggered by repeated reactivation of the Jiangshan-Shaoxing Fault. Combined with deformation to the south, the Early Paleozoic belt shows a positive flower pattern, with opposing kinematics, rooted in the Jiangshan-Shaoxing Fault. During the Early Mesozoic, a general intracontinental belt was developed with uniform kinematics in both the Jiuling Massif and the Xuefengshan Belt, possibly resulted from the far-field effect of the Triassic NW-directed Paleo-Pacific subduction.
机译：为了描述多造山变形并讨论了它的地球动力学演化和​​造山机制，已经对九陵地块的结构进行了研究。详细的结构分析表明，D_1事件的特征是从上至下的NNW韧性剪切与普遍叶酸作用，以及整个区域发育的矿物和伸展线。与D_1变形相比，D_2结构位于韧性剪切带中，具有垂直以下的叶状构造和水平下的E-W趋势线，表明右旋韧性剪切。 D_3事件主要由脆性域中的褶皱和逆冲引起，通过不对称褶皱改变了D_1结构。 D_4的主要结构是重力褶皱和正常断层，对应于以后的扩展。我们的新的地质年代学数据表明，D_1事件发生在465至380 Ma之间，并在该古生代造山带结束时发生了D_2右旋剪切作用，而D_3事件被限制在245-215 Ma。 D_4事件最终导致的九龙岭隆升与华南东部地块的晚中生代伸展有关。连同先前在华南地块的研究，九陵地块的构造模式阐明了江山-绍兴断裂的反复活化引发的早古生代和早中生代陆内带。结合南部的变形，早古生代带呈正花型，运动学相反，植根于江山-绍兴断裂。在中生代早期，九岭断层带和雪峰山带形成了一条普遍的，运动学均一的大陆带，这可能是由于三叠纪西北向古太平洋俯冲作用的远场效应造成的。

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  • 来源
    《Journal of Asian earth sciences》 |2014年第1期|117-130|共14页
  • 作者

    Yang Chu; Wei Lin;

  • 作者单位

    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,Institute of Geology and Geophysics, Chinese Academy of Sciences, 19 Beitucheng Western Road, Chaoyang District, Beijing 100029, China;

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  • 正文语种 eng
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  • 关键词

    Jiuling Massif; Polyphase deformation; Phanerozoic; South China;

    机译：九龙岭;多相变形;代生代华南;

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