The interplay between overriding plate kinematics, slab dip and tectonics
The interplay between overriding plate kinematics, slab dip and tectonics
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最重要的板块运动学、板片倾角和构造之间的相互作用
DOI：
10.1093/gji/ggy365
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发表时间：
2018
影响因子：
2.8
通讯作者：
J. Martinod
中科院分区：
文献类型：
--
作者：
N. Cerpa;Benjamin Guillaume;J. Martinod
在俯冲板块停滞在660公里的地幔不连续性，覆盖板块运动学在很大程度上控制板倾角和覆盖板块构造。虽然板块运动学模型表明，大多数板块的速度变化频繁，俯冲动力学上的覆盖板块速度的时间演化的影响已经相对较少的解决。在本研究中，我们使用二维数值模型来评估覆盖板块远场速度的变化对俯冲几何形状和传递到覆盖板块的水平应力的影响。当覆盖板速度的变化出现在板坯停滞，板坯倾角演变在一个短暂的时期，称为调整时间，达到一个新的边界条件的平衡状态。该模型预测的依赖性的调整时间上的速度变化的值和几个内部参数（俯冲板块密度，厚度和粘度，地幔粘度）。我们估计，在自然界中，调整时间可能是1000 - 3500万年，这表明，大多数现今的俯冲带可能没有处于稳定状态。此外，这些模型预测，覆盖板块速度的变化会产生板块应力状态的暂时性变化。
In subductions where the slab stagnates at the 660-km mantle discontinuity, overriding plate kinematics largely controls slab dip and overriding plate tectonics. Although plates kinematics models suggest frequent velocity changes for most plates, the impact of temporal evolution of overriding plate velocity on subduction dynamics has been relatively little addressed. In the present study, we use 2-d numerical models to assess the effects of changes in overriding plate far-field velocity on subduction geometry and on the horizontal stresses transmitted to the overriding plate. When a change in overriding plate velocity arises during slab stagnation, slab dip evolves during a transient period, called adjustment-time, to reach a state in equilibrium with the new boundary conditions. The models predict a dependency of the adjustment-time on the value of velocity change and on several internal parameters (subducting plate density, thickness, and viscosity, and mantle viscosity). We estimate that the adjustment-times may be ∼10 − 35 Myrs in Nature, which suggests that most of present-day subduction zones with stagnating slabs might not be at a steady-state. Further, the models predict that changes in overriding plate velocity generate high temporary variations in the state of stresses of the plate.
影响因子：
5.3
作者：
Agrusta, Roberto;Goes, Saskia;van Hunen, Jeroen
通讯作者：
van Hunen, Jeroen
新生代板块运动中板块浮力驱动的下行俯冲特征
影响因子：
2.3
作者：
Goes S
通讯作者：
Goes S