TECTONIC EVOLUTION IMPLICATION OF GEOMETRY SHAPE CHARACTERISTICS FOR MANILA TRENCH
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摘要: 通过对马尼拉海沟海底地形地貌、构造特征及其相关地震等数据资料的分析,结合俯冲带动力学数值模拟成果,尤其是Schellart等的模式,详细讨论了马尼拉海沟几何形态、海沟南北段俯冲角度突变等构造特征。分析认为,南海中代表古扩张脊的黄岩海山链的俯冲挤入对马尼拉俯冲带的几何形态没有造成较大的影响,其几何形态较符合中等长度(2 000~3 000 km)的海沟模型。由海沟后退和板片反转引起的平行于马尼拉海沟方向的地幔流加剧了海沟南北段俯冲角度的突变。Abstract: Seafloor topography, tectonic characteristics of the Manila trench and the related earthquake focus data were analyzed.Combined with dynamics numerical simulation results for subduction zones, especially Schellart model, the tectonic characteristics of geometry shape and the sharply changing north-south dive angle for the Manila trench were particularly discussed.Study results show that Huangyan seamount chain which was representing the ancient spreading ridge in the South China Sea subducted into the Manila trench,which did not bring serious influence on the geometry shape of the Manila subduction zone, and its geometry shape corresponded with a trench model of medium length (2 000~3 000 km).Mantle flow parallel to the Manila trench caused by trench retreat and slab rollback aggravated the north-south dive angle to change sharply for the Manila trench.
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Key words:
- subduction zone /
- geometry shape /
- mantle flow /
- Manila trench
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