挖掘的高压岩石中的应力异质性揭示了深度潜水接口的短暂合
Yawei Wu1,2,3, Samuel Angiboust3,4, Jianxin Zhang5
1State Key Laboratory of Deep Earth and Mineral Exploration, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, China.
Nature communications
|October 14, 2025
概括
深度潜伏区仍然是神秘的. 这项研究揭示了古代俯冲区岩石中的脱位爬行,这表明在缓慢滑动事件 (SSEs) 期间局部加强.
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
- 材料科学 是一种材料科学.
背景情况:
- 俯冲区的风学和应力分布受到很小的约束,特别是在过渡区 (40-60公里深) 发生深缓滑事件 (SSEs) 的过渡区.
- 了解流体分布和板接口异质性对于建模地震和无地震滑动至关重要.
研究的目的:
- 为了研究古代俯冲界面的应力分布和爬行机制.
- 为板面接口的形学和矛盾的高切削应力物理起源提供约束.
主要方法:
- 从北吉利安古沉降界面挖掘出的蓝石面的微观结构分析.
- 从观察到的微剪切区域推断出拉伸率和剪切应力.
主要成果:
- 在metachert块中记录了基于位的爬行存在.
- 确定了与叶片平行微剪切区域,推断的拉伸率为10^-9 s^-1和剪切应力>100 MPa.
- 观察到的微剪片表明,其强度高于周围的石灰岩基质.
结论:
- 观察到的几十年来发生的微裂变,为潜流区内的局部增强机制提供了洞察力.
- 大规模缓慢滑动事件 (SSEs) 期间的短暂块相互作用可能解释局部高应力.
- 这些发现有助于理解深度潜水道的复杂动态.
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