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首页> 外文期刊>Journal of Asian earth sciences >The influence of a weak upper ductile detachment on the Longmen Shan fold-and-thrust belt (eastern margin of the Tibetan Plateau): Insights from sandbox experiments
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The influence of a weak upper ductile detachment on the Longmen Shan fold-and-thrust belt (eastern margin of the Tibetan Plateau): Insights from sandbox experiments

机译：弱韧性拆卸对龙门山折叠皮带（藏高原东部）的影响：沙箱实验见解

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摘要

The topic of the Longmen Shan fold-and-thrust belt has been vigorously debated due to the steep topography in contrast with the low convergence rate and earthquake hazards. The Longmen Shan fold-and-thrust belt is characterized by two main detachments: a strong lower detachment at 15-17 km depth in the hinterland and a weak upper detachment at similar to 7 km depth in the Sichuan Basin. Nevertheless, how the two detachments control deformation in the Longmen Shan remains unclear. In this study, we focus on the mechanical strengths of the two detachments in the study area and design three analog models to investigate the kinematics and mechanisms of the Longmen Shan fold-and-thrust belt. All three model experiments have the same strong lower detachments at the basement, but different upper detachments. The results indicate that for Model 1 with no upper detachment and Model 2 with a strong frictional upper detachment, the strain and deformation only concentrate near the mobile backwall, and particle image velocimetry analysis reveals that both models deform in the forward in-sequence style. However, for Model 3 with a weak ductile upper detachment, the strain and deformation propagate into the foreland, and the model deforms in the out-of-sequence style consistent with the Longmen Shan fold-and-thrust belt. The model results indicate that the spatial relation of strong lower detachment and weak upper detachment may be one of the important factors producing the current structural pattern and the out-of-sequence style of the Longmen Shan fold-and-thrust belt.
机译：由于陡峭的地形与低收敛速度和地震危害相比，由于陡峭的地形，龙门山折叠带的主题得到了大力争论。龙门山折叠腰带的特点是两个主要的脱离：在腹地的15-17公里深度下脱离，在四川盆地中的7公里深度脱离。尽管如此，龙门山的两次脱离控制变形是如何尚不清楚的。在这项研究中，我们专注于研究区两项脱离的机械优势，并设计三种模拟模型，以研究龙门山折叠带的运动学和机制。所有三种模型实验在地下室具有相同的较强的脱离，但上部脱离不同。结果表明，对于没有上部脱离和模型2的模型1，具有强烈的摩擦上部拆卸，应变和变形仅集中在移动反壁附近，并且粒子图像速度分析显示两种型号都以前向顺序变形。然而，对于具有弱延展性上脱离的模型3，应变和变形传播到前陆，并且模型以与纵向山折叠带均一致的符合序列式的变形。模型结果表明，强低脱离和弱的上拆卸的空间关系可以是产生当前结构图案的重要因素之一，以及龙门山折叠带的术语的序列异。

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  • 来源
    《Journal of Asian earth sciences》 |2020年第15期|104220.1-104220.10|共10页
  • 作者

    Cui Jian; Jia Dong; Yin Hongwei; Chen Zhuxin; Li Yiquan; Wang Maomao; Fan Xiaogen; Shen Li; Sun Chuang; Li Zhigang; Ma Delong; Zhang Yikun;

  • 作者单位

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

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

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

    PetroChina Res Inst Petr Explorat & Dev Beijing 100083 Peoples R China;

    Nanjing Univ Sch Geog & Ocean Sci MOE Key Lab Coast & Isl Dev Nanjing Peoples R China;

    Hohai Univ Coll Oceanog Nanjing 210098 Jiangsu Peoples R China;

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

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

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

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

    PetroChina Key Lab Reservoir Characterizat Res Inst Petr Explorat & Dev Northwest Lanzhou 730020 Peoples R China;

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

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  • 正文语种 eng
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  • 关键词

    Analog modeling; Particle image velocimetry (PIV); Longmen Shan fold-and-thrust belt; In-sequence; Out-of-sequence;

    机译：模拟建模;粒子图像VELOCIMETRY（PIV）;龙门山折叠带;依次;术语;

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