AbstractGlobal seismic tomography of the subduction zones shows that the subducting slabs could either'/> Subduction Mode Selection During Slab and Mantle Transition Zone Interaction: Numerical Modeling
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Subduction Mode Selection During Slab and Mantle Transition Zone Interaction: Numerical Modeling

机译：板坯和地幔转换区交互期间的俯冲模式选择：数值建模

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摘要

AbstractGlobal seismic tomography of the subduction zones shows that the subducting slabs could either stagnate around the 660-km discontinuity, or penetrate into the lower mantle. The stagnating slabs also have various morphologies. These are directly related to the interaction between the subducting slabs and the mantle transition zone (MTZ), the dynamics of which are still debated. Using a 2-D thermo-mechanical model, we systematically investigated the modes of subduction in the mantle transition zone and explored the key constraints of various subduction styles. Four basic subduction modes are obtained in the numerical experiments, including one with slab penetrating through the 660-km discontinuity and three other modes with slab stagnating in the MTZ (i.e. folding, lying and rolling-back). The numerical models indicate that the age of subducting oceanic plate, the thickness of overriding continental lithosphere and the convergence velocity play crucial roles in the dynamics of subducting slab and MTZ interaction. In general, the young subducting slab favors the penetration or folding mode, whereas the old subducting slab tends to result in lying or rolling-back mode, although other parameters can also affect. Our models also show a strong correlation between the subduction mode selection and dip angle of the slab tip when reaching the 660-km phase boundary.]]>
机译：Abstract俯冲带的全球地震层析成像显示，俯冲板块可能在660 km的不连续性附近停滞，或穿透下地幔。停滞的板块也有各种形态。这些与俯冲板块和地幔过渡带（MTZ）之间的相互作用直接相关，其动力学仍有争议。利用二维热力学模型，我们系统地研究了地幔过渡带的俯冲模式，并探索了各种俯冲样式的关键制约因素。在数值实验中获得了四种基本俯冲模式，其中一种是板块穿过660 km的不连续面，另三种是板块在MTZ中停滞的模式（即折叠、平躺和后退）。数值模型表明，俯冲大洋板块的年龄、俯冲大陆岩石圈的厚度和收敛速度对俯冲板块和MTZ相互作用的动力学起着关键作用。一般来说，年轻俯冲板块倾向于穿透或褶皱模式，而旧俯冲板块倾向于平躺或后退模式，尽管其他参数也会影响。我们的模型还显示，当到达660 km的相边界时，俯冲模式选择与板块尖端倾角之间存在很强的相关性]>

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  • 来源
    《Pure and Applied Geophysics》 |2018年第2期|共20页
  • 作者

    Yanan Shi; Dongping Wei; Zhong-Hai Li; Ming-Qi Liu; Mengxue Liu;

  • 作者单位

    Key Laboratory of Computational Geodynamics College of Earth Sciences University of Chinese Academy of Sciences;

    Key Laboratory of Computational Geodynamics College of Earth Sciences University of Chinese Academy of Sciences;

    Key Laboratory of Computational Geodynamics College of Earth Sciences University of Chinese Academy of Sciences;

    Key Laboratory of Computational Geodynamics College of Earth Sciences University of Chinese Academy of Sciences;

    Key Laboratory of Computational Geodynamics College of Earth Sciences University of Chinese Academy of Sciences;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地球物理学;
  • 关键词

    Mantle transition zone; subduction mode; slab penetration/stagnation; numerical modeling;

    机译：地幔过渡区;俯冲模式;平板渗透/停滞;数值建模;

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