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首页> 外文期刊>Journal of Asian earth sciences >Triassic two-stage intra-continental orogensis of the South China Block, driven by Paleotethyan closure and interactions with adjoining blocks
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Triassic two-stage intra-continental orogensis of the South China Block, driven by Paleotethyan closure and interactions with adjoining blocks

机译：南部中国南方南部欧洲欧洲欧洲欧洲欧洲葡萄球菌，由古紫陆闭合和与毗邻块的相互作用驱动

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摘要

The South China Block (SCB) is tectonically bounded by the Tethyan and Pacific subduction zones and the Qinling-Dabie HP-UHP metamorphic zone. Triassic tectonic activity was a key phase in the tectonic history of the SCB and in creating the fundamental framework of East Asia. The geometry and kinematics of the Triassic deformation sheds light on the mechanism driving intra-continental omgenesis in the SCB. Our new field- and mapped- based structural analysis, along with thermo-chronological dating results, reveal two-stage distinct Triassic deformations in the southern SCB involving top-to-north dextral thrusting at similar to 250-225 Ma and NE-trending sinistral transpression at similar to 230-190 Ma. Early Triassic dextral transpression is marked by WNW-trending high-strain zones and thrust nappes/sheets, which might have been rooted beneath the HainanYunkai basement along a low angle, middle-upper crustal basal detachment. It transformed from a thickskinned fold-and-thrust belt to thin-skinned Jura-like patterns with northerly-propagating deformation. Late Triassic NE-trending sinistral transpression was accompanied by a series of the parallel folds and thrusts in the SCB interior, resulting in the development of the regional positive-flower geometry and reactivation of the preexisting structures. Such signatures, in combination with the available geological, geochronological, and paleogeographic observations, suggest two-stage (early-middle and late Triassic) intra-continental orogenesis in the SCB, were controlled by the clockwise scissor-like closure of the Paleotethyan Ocean and its interactions with the adjoining blocks including deep-subduction beneath the North China Block and limited lateral extrusion due to the obstructing paleo-Pacific plate.
机译：南中国街区（SCB）由Tethyan和Pacific俯冲区和秦岭-Dabie HP-UHP变质区进行了根本束缚。三叠纪构造活动是SCB的构造历史和创造东亚基本框架的关键阶段。三叠纪变形的几何和运动学揭示了在SCB中驾驶欧式欧式全部的机构。我们的新现场和基于映射的结构分析，以及热时间时间约会结果，揭示了南部SCB中的两阶段不同的三叠叠变形，涉及与250-225 mA和Ne-Trending Sinestral相似的顶到北右侧推动变形与230-190 mA类似。早期三叠纪的右墨经变形是由WNW趋势的高菌区和推力纳米型/薄片标记，这可能沿着低角度，中上层地壳基础脱离植根于海内坦地下室。它从厚度的折叠和推力皮带转变为具有北繁殖变形的薄皮汝拉状图案。晚期三叠纪Ne-Trending Sinistral Transurecle伴随着SCB内部的一系列平行折叠和推力，导致区域正花几何形状的发展和预先存在的结构的再活化。这些签名与可用的地质，地质学和古地理观察组合，建议SCB中的两阶段（早期和晚期三叠系）欧式欧洲欧洲欧洲内部内孔，由古乙西岛海洋的顺时针剪刀封闭它与毗邻块的相互作用，包括在华北地区下方的深层俯冲和由于古太平洋阻碍而导致的侧向挤压有限。

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  • 来源
    《Journal of Asian earth sciences》 |2021年第2期|104648.1-104648.18|共18页
  • 作者

    Wang Yuejun; Wang Yang; Zhang Yuzhi; Cawood Peter A.; Qian Xin; Gan Chengshi; Zhang Feifei; Zhang Peizhen;

  • 作者单位

    Sun Yat Sen Univ Sch Earth Sci & Engn Guangdong Prov Key Lab Geodynam & Geohazards Guangzhou 510275 Guangdong Peoples R China|Southern Marine Sci & Engn Guangdong Lab Zhuhai Zhuhai 519082 Peoples R China;

    Sun Yat Sen Univ Sch Earth Sci & Engn Guangdong Prov Key Lab Geodynam & Geohazards Guangzhou 510275 Guangdong Peoples R China|Southern Marine Sci & Engn Guangdong Lab Zhuhai Zhuhai 519082 Peoples R China;

    Sun Yat Sen Univ Sch Earth Sci & Engn Guangdong Prov Key Lab Geodynam & Geohazards Guangzhou 510275 Guangdong Peoples R China|Southern Marine Sci & Engn Guangdong Lab Zhuhai Zhuhai 519082 Peoples R China;

    Monash Univ Sch Earth Atmosphere & Environm Melbourne Vic 3800 Australia;

    Sun Yat Sen Univ Sch Earth Sci & Engn Guangdong Prov Key Lab Geodynam & Geohazards Guangzhou 510275 Guangdong Peoples R China|Southern Marine Sci & Engn Guangdong Lab Zhuhai Zhuhai 519082 Peoples R China;

    Sun Yat Sen Univ Sch Earth Sci & Engn Guangdong Prov Key Lab Geodynam & Geohazards Guangzhou 510275 Guangdong Peoples R China;

    Northwest Univ Dept Geol State Key Lab Continental Dynam Xian 710069 Peoples R China;

    Sun Yat Sen Univ Sch Earth Sci & Engn Guangdong Prov Key Lab Geodynam & Geohazards Guangzhou 510275 Guangdong Peoples R China|Southern Marine Sci & Engn Guangdong Lab Zhuhai Zhuhai 519082 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    South China Block; Structural and thermo-chronological analyses; Two-stage intra-continental orogensis; Triassic scissors-like closure of Paleotethyan; Ocean; Interactions with adjoining blocks;

    机译：华南地区;结构和热时间中间分析;两阶段内欧式orgensis;三叠纪剪刀 - 古代古代的封闭件;海洋;与毗邻块的相互作用;

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