海山俯冲过程中的变形特征——物理模拟和数值模拟证据
发布时间：2019-04-19 20:08
【摘要】：文章通过物理模拟和数值模拟相结合的方法,探讨了海山在俯冲过程中自身出现的变化特征。结果表明,海山在增生楔体中俯冲时,主要变化特征表现为其上覆的大洋沉积物的刮落,唯有海山尾部的洋壳有小部分大洋沉积物得以保存;当海山开始进入俯冲通道时,海山逐渐由向陆壳之下硬挤入变为向地幔挠曲,而向地幔的挠曲变形为海山进入俯冲提供了充足的空间并使俯冲洋壳的俯冲角度增加。俯冲挠曲过程有效降低了陆壳与海山之间的耦合度,从而降低大震的发生概率。此外,文章也对多手段研究俯冲带变形的尝试进行了探讨。
[Abstract]:In this paper, the variation characteristics of seamounts in the process of subduction are discussed by means of physical simulation and numerical simulation. The results show that when the seamounts subduction in the accretive wedge, the main variation characteristics are the scraping and falling of the overlying ocean sediments, and only a small part of the oceanic crust in the tail of the seamounts can be preserved. When the seamounts begin to enter the subduction channel, the seamounts gradually change from hard squeezing under the continental crust to flexure to the mantle, and the flexure deformation of the mantle provides sufficient space for the seamounts to subduction and increases the subduction angle of the subduction oceanic crust. The subduction flexure process effectively reduces the coupling degree between the continental crust and seamounts, thus reducing the occurrence probability of large earthquakes. In addition, the attempt to study the deformation of subduction zone by multi-means is also discussed in this paper.
【作者单位】： 中国科学院南海海洋研究所中国科学院边缘海地质重点实验室;中国科学院大学;
【基金】：国家重大油气专项(2011ZX05025-003-005) 国家自然科学基金-广东省联合基金项目(U1301233)~~
【分类号】：P736.1
本文编号：2461241
[Abstract]:In this paper, the variation characteristics of seamounts in the process of subduction are discussed by means of physical simulation and numerical simulation. The results show that when the seamounts subduction in the accretive wedge, the main variation characteristics are the scraping and falling of the overlying ocean sediments, and only a small part of the oceanic crust in the tail of the seamounts can be preserved. When the seamounts begin to enter the subduction channel, the seamounts gradually change from hard squeezing under the continental crust to flexure to the mantle, and the flexure deformation of the mantle provides sufficient space for the seamounts to subduction and increases the subduction angle of the subduction oceanic crust. The subduction flexure process effectively reduces the coupling degree between the continental crust and seamounts, thus reducing the occurrence probability of large earthquakes. In addition, the attempt to study the deformation of subduction zone by multi-means is also discussed in this paper.
【作者单位】： 中国科学院南海海洋研究所中国科学院边缘海地质重点实验室;中国科学院大学;
【基金】：国家重大油气专项(2011ZX05025-003-005) 国家自然科学基金-广东省联合基金项目(U1301233)~~
【分类号】：P736.1
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