项目名称: 俯冲碰撞体系的物理模拟:以南海-菲律宾俯冲碰撞体系为例
项目编号: No.41206040
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 海洋科学
项目作者: 张云帆
作者单位: 中国科学院南海海洋研究所
项目金额: 24万元
中文摘要: 俯冲碰撞产生的沟弧盆系是洋壳循环,壳幔物质交换的主要场所。南海东部边界沿马尼拉海沟到台湾岛北部体现了南海海盆与菲律宾海板块之间从俯冲到弧陆碰撞-增生的完整过程。由于俯冲-碰撞带的内部结构和变形过程是俯冲工厂研究尚未揭晓的一个谜,因此本申请拟在地质分析的基础上,建立南海-菲律宾海俯冲-碰撞-增生的演化模式,利用准三维与三维构造物理模拟实验,通过变换加载方式、板片运动速度与方向、设置刚性地块等实验方法,观察平面与剖面的变形,总结两板块接触带不同构造单元的构造变形特征,揭示影响俯冲变形的各项控制因素及主控因素,探讨俯冲程度对增生楔形态的影响,分析火山弧对弧前盆地关闭的制约,并与世界其他俯冲带变形特点对比,最终建立南海-菲律宾俯冲碰撞的合理模式,完善俯冲动力学理论。本申请的研究可对探讨俯冲带不同演化阶段结构特征提供重要的实验依据。
中文关键词: 增生楔;弧前盆地;物理模拟;南海俯冲;
英文摘要: Plate tectonics is a complex dynamic system, in which subduction is one of the most important features. Arc-trench-basin system is main area of crustal circulation and mantle interchange. From Manila trench to the northern part of Taiwan Island, that indicates the process from subduction to collide. Because of the inside structure and deformation is not clearly, the application will use the analogue modeling based upon geological structure analysis in order to solve the following problem:built the process of subduction-collide-accretionary in South China Sea- Philippines subduction zone. According to change loading regime, velocity and direction of model, plat, rigid block;observe deformation in surface and profile, summary tectonic elements characteristic, reveal factor and most important factor;research on that subduction stages have an effect on accretionary wedge;analysis forearc basin decline in connection with volcanic arc;compare with other subduction zone all over the world in order to built the deformation characteristic and process evolution of South China Sea- Philippines subduction zone. This research will be an important experiment reference to evolution stages of subduction.
英文关键词: Accretionary wedge;Forearc basin;Analogue modeling;South China Sea;