华北克拉通破坏动力学机制:数值模拟的启示

发布时间：2018-03-26 04:16

本文选题：克拉通破坏　切入点：动力学机制　出处：《海洋地质与第四纪地质》2017年04期

【摘要】：华北克拉通是古老克拉通遭到破坏的一个典型例子。近几十年的地球物理、地球化学以及地质学等多学科研究都证实了华北克拉通东部自中生代以来遭受了强烈的改造和破坏,表现出大规模的岩浆活动、构造变形以及岩石圈减薄。华北克拉通破坏的动力学过程一直以来都是地球科学领域关心的热点问题,也存在很多争论,而数值模拟手段也逐渐成为研究华北克拉通破坏动力学机制的重要手段之一。前人利用数值模拟手段从拆沉、热侵蚀、俯冲脱水、化学交代等不同角度开展了一系列研究工作,为很多地球物理、地球化学以及地质学观测提供了一定的动力学模型支持,为理解华北克拉通破坏的动力学成因机制奠定了坚实基础。但是需要指出的是,克拉通破坏是一个非常复杂的过程,目前的数值模型还存在很大的局限性,要更加深入透彻地理解华北克拉通破坏的动力学成因机制,在未来还需要从以下几个方面开展进一步深入细致的研究:(1)从二维粗略模型向三维精细模型的过渡;(2)考虑更为实际的岩石流变学特性、相变过程;(3)利用板块重建等技术为数值模型提供板块运动历史等运动学约束;(4)拆沉、热-化学侵蚀、俯冲脱水等作用相互耦合的动力学模拟。
[Abstract]:The North China Craton is a typical example of the destruction of the ancient cratons. In recent decades, multidisciplinary studies such as geophysics, geochemistry and geology have confirmed that the eastern part of the North China Craton has suffered intense transformation and destruction since the Mesozoic. The dynamic process of the North China Craton failure has always been a hot issue of interest in the field of earth science, and there have been many controversies. Numerical simulation has gradually become one of the important means to study the dynamic mechanism of the North China Craton failure. Previous studies have been carried out from different angles such as desinking, thermal erosion, subduction dehydration, chemical metasomatism, etc. It provides a certain dynamic model support for many geophysical, geochemical and geological observations, and lays a solid foundation for understanding the dynamic genetic mechanism of the North China Craton failure. However, it should be pointed out that, Cratonic failure is a very complicated process, and the current numerical model has great limitations. It is necessary to understand more thoroughly the dynamic mechanism of the North China craton failure. In the future, it is necessary to carry out further in-depth and meticulous research on the following aspects: (1) the transition from two dimensional rough model to three dimensional fine model is to consider the more practical rheological characteristics of rock. In the process of phase transformation, plate reconstruction and other techniques are used to provide kinematics constraints such as plate motion history for the numerical model. The coupled dynamic simulation of subsidence, thermal-chemical erosion and subduction dehydration is carried out.
【作者单位】：海底科学探测与技术教育部重点实验室中国海洋大学海洋地球科学学院;青岛海洋科学与技术国家实验室海洋地质过程与环境功能实验室;
【基金】：国家杰出青年基金(41325009) 国家重点研发计划项目(2016YFC0601002,2017YFC0601400-1) 泰山学者特聘教授项目鳌山卓越科学家计划(2015ASTP-0S10) 中国博士后科学基金(2016M602193) 大地测量与地球动力学国家重点实验室开放基金(SKLGED2016-2-1-E)
【分类号】：P542

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