动态不稳定性产生了在中洋山脊的转变断层.
1Swiss Federal Institute of Technology Zurich, Department of Geosciences, Zurich, Switzerland. taras.gerya@erdw.ethz.ch
概括
变形断层是由于板边界的不稳定性而积极形成的,而不是遗传结构. 数字模型显示,不对称的增长造成了这些断层,随着时间的推移,由于板块动态和峰跳跃,偏移会随着时间的推移而变化.
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
- 地力学是什么?地力学是什么?
背景情况:
- 变形断层是中洋山脊和陆地板块构造学的主要特征.
- 传统上,它们被视为遗传结构,随着时间的推移而不断偏移.
研究的目的:
- 为了研究底层的变形断层形成的动态过程,在中洋山脊.
- 挑战传统的观点,把变形断层作为仅仅是遗传的结构.
主要方法:
- 利用数值建模来模拟板块构造过程.
- 纳入了动态不稳定性和非对称板块生长的概念.
主要成果:
- 变形断层从构造板边界的动态不稳定性中积极发展.
- 不对称的板块生长自发地在交替的方向上启动断层形成.
- 由此产生的曲线脊在数百万年内演变为变形断层.
- 与骨折相关的削弱稳定了脱离故障,影响了偏移演变.
结论:
- 变形故障是积极形成特征,而不仅仅是遗传结构.
- 板块边界动态,特别是不对称的增长,是转变断层发展的主要驱动因素.
- 变形故障补偿不是恒定的,而是不断地和不连续地演变.
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