扩展性构造学和海洋转变断层的两阶段地积
Ingo Grevemeyer1, Lars H Rüpke2, Jason P Morgan3
1GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany. igrevemeyer@geomar.de.
Nature
|March 18, 2021
概括
海洋转变断层比预期的更深, 这项研究揭示了变形断层系统的两阶段积累过程.
科学领域:
- 地质学
- 构造学
- 海洋地质学
背景情况:
- 海洋转变断层是形成断裂区域的活跃板块边界.
- 板块构造学理论将它们作为保守的冲滑边界.
- 现有的模型无法完全解释所观察到的海底深度.
研究的目的:
- 在海洋转变断层观察到的海底深度和板冷却模型之间的差异.
- 分析变形断层山脊交叉点的积累过程.
- 了解塑料剪切故障在转变故障动态中的作用.
主要方法:
- 来自 41 个海洋转变断层的高分辨率多束浴度数据的汇编.
- 对海底深度相对于断裂区域的变化进行分析.
- 三维粘性塑料数值建模剪切故障和延伸.
主要成果:
- 沿着变形断层的海底系统地比相关的断层区域更深 (高达1.6公里).
- 在变形断层的交叉点上的积累不对称,在内角有更深的节点盆地.
- 数字模型显示斜切和深度延伸,薄化地和石化层.
结论:
- 变形断层不是纯粹的保守性;它们涉及地的稀薄和岩层延伸.
- 变形断层系统的收缩是一个两阶段的过程,涉及脊梁交叉动态.
- 观察到的浴度对变形断层演变的简单板冷却模型提出了挑战.
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