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能量反对大陆强度的影响
Klaus Regenauer-Lieb1, Roberto F Weinberg, Gideon Rosenbaum
1Institut für Geowissenschaften, Johannes Gutenberg Universität, Mainz 55099, Germany. klaus@cyllene.uwa.edu.au
Nature
|July 11, 2006
概括
由于动态相互作用,大陆的强度比以前认为的要弱. 这项研究揭示了大陆变形过程中新的断层和脱层.
科学领域:
- 地质物理学 地质物理学
- 构造学 构造学 构造学 构造学
- 计算地力学计算地力学
背景情况:
- 大陆强度的古典模型依赖于准静态的浮力学,忽视了脆性和柔性地层之间的动态相互作用.
- 这些相互作用使脆性-柔性过渡的故障过程复杂化,并且需要对应变局部化进行合的能量考虑.
研究的目的:
- 通过解决完全合的能量,动量和连续性方程来研究大陆变形.
- 了解控制大陆变形的动态强度演变和复杂的反过程.
主要方法:
- 解决完全合的能量,动量和连续性方程以建模大陆变形.
- 分析压力局部化在脆性-柔性过渡和脱离断层的形成.
主要成果:
- 大陆的动态强度演变明显低于静态模型预测的.
- 在脆性-柔性过渡处的应力局部化自发地产生了中层地脱离缺陷.
- 下层地和地幔之间形成了一个额外的分离层,解释了观察到的水平运动.
结论:
- 地层之间的动态相互作用从根本上改变了大陆的强度概况.
- 该模型解释了观察到的脱层的形成,这些层负责大陆变形中的大规模水平运动.
- 这项研究为理解大陆构造学提供了更准确,更动态的框架.
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