Seismic detection of deep structure for Southern Kyueshu-Palau Ridge and its possible implications for subduction initiation
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摘要:
板块俯冲起始机制是板块构造理论发展的关键和新方向，九州-帕劳海脊是研究俯冲带起始机制的典型地区。在回顾板块俯冲起始机制研究历史的基础上，对九州-帕劳海脊及邻区研究现状和存在问题以及对板块俯冲起始机制的指示进行了概述。计划通过在九州-帕劳海脊南段及邻区开展海底地震仪为主的深地震探测，获得研究区高分辨率的岩石圈固体-流体结构，以了解古太平洋板块向西菲律宾海盆俯冲不同阶段的板块深部行为，并在动力学模拟实验及与实际对比的基础上，建立九州-帕劳海脊及邻区从俯冲起始-岛弧裂离-弧后伸展的完整演化历史，揭示板块俯冲起始机制、动力学过程及其控制因素。
Abstract:The Kyushu-Palau Ridge (KPR) is an excellent place to study the initiation of plate subduction, and thus a unique natural laboratory for developing the plate tectonic theory. Based on a thorough review of literatures, we tried in this paper to reveal the solid vs. liquid structure of the lithosphere using the geophysical data by OBS and OBEM along a regional transection passing through the West Philippine Basin, the KPR, and the Perce-Vela basin. Combined with geochemical studies and computational geodynamic simulations, the characteristics of the deep subducted slabs, the different oceanic lithosphere, the corresponding magmatic activities and mechanism as well as the flux and cycling of the subducted materials are investigated. Upon the basis, a complete evolution model including subduction initiation, island arc splitting, and the back-arc seafloor spreading is proposed in this paper for the tectonic evolution of a subduction zone.
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