板块俯冲带研究中的数值实验  

Numerical Simulation in Subduction Zone Study

作　　者：李大鹏[1] 陈岳龙[1] 靳野[2] 

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083 [2]中国地质大学(北京)海洋学院,北京100083

出　　处：《地球科学进展》2010年第6期582-596,共15页Advances in Earth Science

基　　金：国家自然科学基金项目"青海共和-花石峡碎屑沉积岩地球化学"(编号:40673046)资助

摘　　要：板块构造是一个复杂的动力学体系,俯冲作为板块间相互作用中最重要的特征之一,长期以来通过各种手段并未完全得以认识。近10年来,俯冲带数值模型迅速发展,而2D/3D数值实验也取得许多新的认识:地幔柱顶托作用触发俯冲可能存在于行星演化早期;板片脱水形成的薄弱剪切带是导致现今俯冲样式为单向不对称俯冲的主要决定因素;俯冲增生岩浆的化学组成很大程度上取决于俯冲的发展过程,熔体抽离的强度和俯冲板片年龄共同影响新生地壳的体积。Plate tectonics is a complex dynamic system and subduction is one of the most important features,which,however,has not been completely understood.In the last decade,based on the obtained evidence in geophysics,tectonics,petrology and geochemistry,numerical simulation applied in subduction zone research have achieved many breakthrough contributions.The plume upwelling switched subduction can happened at the juvenile stage of the planet evolution.The weak shear zone that formed by the dehydration of the subduction slab is the dominant impact factor for the one-sided asymmetric subduction pattern.The chemical composition of the subduction magma mainly depends on the subduction evolution processes.Both intensity of the melt extraction and the age of the subdcution slab have influence on the volume of the accreted crust.

关 键 词：俯冲 数值模拟 流变学 地球动力学 

分 类 号：P542.4[天文地球—构造地质学] P435[天文地球—地质学]