西太平洋俯冲带的研究及其动力学意义
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摘要
讨论了西太平洋俯冲带的分布及特征、西太平洋Wadati-Benioff带的形态及俯冲带上的应力状态及太平洋板块、菲律宾海板块与欧亚板块之间的相互作用;总结了地震层析成像结果;计算了俯冲板块在地幔中引起的P波速度异常,提出了俯冲板块与660km间断面相互作用的4种可能;研究了俯冲板块物理性质的变化、俯冲板块产生的负浮力及其影响因素;提出需要开展俯冲带对东亚大陆构造运动和演化的影响、俯冲带相互关系及演化的研究.
The distribution and characteristics of the subduction zone,configuration of the Wadati- Benioff zone and the stress state of the subduction zone in the western Pacific region were studied; the interaction between the Pacific plate, Philippine sea plate and Eurasia plate and its influence on the continent of east asia were discussed; the anomaly in the mantle caused by the subducted slab was calculated using FEM,four posibilities of the penetration of the subducted slab to the 660Km.discontinuity were proposed. The variation of physical properties and the negative buoyancy of the subducted slab were calculated numerically.Study on the influence of the subduction zone, on the structure and evolution of the continent in east Asiaand on the relation and evolution of the subduction zones were proposed.
引文
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