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首页> 外文期刊>Tectonics >Deformation of erosive and accretive forearcs during subduction of migrating and non-migrating aseismic ridges: Results from 3-D finite element models and application to the Central American, Peruvian, and Ryukyu margins
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Deformation of erosive and accretive forearcs during subduction of migrating and non-migrating aseismic ridges: Results from 3-D finite element models and application to the Central American, Peruvian, and Ryukyu margins

机译：迁移和非迁移抗震脊俯冲过程中侵蚀性和增生性前臂的变形：3-D有限元模型的结果及其在中美洲，秘鲁和琉球边缘的应用

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摘要

Subduction of aseismic oceanic ridges causes considerable uplift and deformation of the upper plate and may lead, for example, to the indentation of the forearc, the formation of marine terraces, or distinct fault patterns in the upper plate. Depending on the orientation of the ridge relative to the plate convergence direction, the ridge may either be stationary or migrate along the margin. Here we use three-dimensional numerical models to investigate the tectonic evolution of forearcs affected by ridge subduction. In different experiments, we distinguish between migratingon-migrating ridges and accretive/erosive margins, respectively. Our results reveal that displacement and strain fields above migrating and non-migrating ridges are asymmetric with respect to the ridge axis unless both ridge and plate convergence direction are perpendicular to the trench. As the asymmetric deformation pattern shifts along the margin through time, uplift caused by the underthrusting ridge is followed by subsidence when the ridge crest passed by, and regions initially experiencing shortening may subsequently undergo extension and vice versa. If the forearc comprises an accretionary prism, the ridge-induced reentrant is larger than those in models with erosive forearcs and strain localizes in the frontal part of the wedge. Additional models with a setup adjusted to the Cocos and Gagua Ridges provide constraints on the onset of their subduction at the Central American and Ryukyu margins at similar to 2Ma and 1Ma, respectively. Displacement and strain fields from a model for the Nazca Ridge collision zone show good agreement with geological data from marine terraces and Quaternary faulting.
机译：地震洋脊的俯冲会引起上板的大量隆升和变形，并可能导致例如前臂的凹陷，海洋阶地的形成或上板的明显断层样式。取决于脊相对于板会聚方向的取向，脊可以是固定的，也可以沿着边缘移动。在这里，我们使用三维数值模型来研究受岭俯冲影响的前臂的构造演化。在不同的实验中，我们分别区分了迁移/非迁移脊和增生/侵蚀边缘。我们的结果表明，除非脊和板的会聚方向都垂直于沟槽，否则迁移和非迁移脊上的位移和应变场相对于脊轴是不对称的。随着非对称变形模式随时间沿边缘移动，当脊顶经过时，由下冲脊引起的隆起会随之下沉，最初经历缩短的区域可能随后发生伸展，反之亦然。如果前臂包括增生棱柱，则脊诱导的凹入处大于带有侵蚀性前臂且应变位于楔形前部的模型中的凹入处。其他模型已根据Cocos和Gagua脊进行了调整，从而限制了它们在中美洲和琉球边界的俯冲作用，分别接近2Ma和1Ma。纳斯卡岭碰撞带模型的位移和应变场与海洋阶地和第四纪断层的地质数据显示出很好的一致性。

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  • 来源
    《Tectonics》 |2015年第10期|1769-1791|共23页
  • 作者

    Zeumann Stefanie; Hampel Andrea;

  • 作者单位

    Leibniz Univ Hannover, Inst Geol, D-30167 Hannover, Germany;

    Leibniz Univ Hannover, Inst Geol, D-30167 Hannover, Germany;

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