使用Vp/Vs估计成熟的缓慢扩散的海洋地中由于蛇形化而导致的过量结合水含量
Lianjun Li1, Jenny Collier2, Tim Henstock3
1Department of Earth Science and Engineering, Imperial College London, SW7 2BP, London, UK. l.li21@imperial.ac.uk.
Nature communications
|July 23, 2025
概括
在成熟的海洋地中结合的水对于潜水带和深层地幔至关重要. 这项研究显示,缓慢扩散的大西洋地中的蛇形化矿储存了更多的水,影响了地质水资源预算.
科学领域:
- 地质物理学 地质物理学
- 海洋学 海洋学 海洋学
- 地质化学 地质化学
背景情况:
- 海洋地含有化学结合的水,对地质过程如浮沉至关重要.
- 由于岩石学变化和有限的地震数据,估计缓慢扩散的海洋地中的水含量是复杂的.
- 蛇形化是改变地水含量的关键过程.
研究的目的:
- 为了建模P波和S波地震速度 (Vp和Vs) 和成熟的大西洋海洋地中过剩的水.
- 为了研究蛇形化在加水缓慢扩散的地在小安地列群岛附近的作用.
- 量化了水合海洋地对俯冲水预算的贡献.
主要方法:
- 利用2D高分辨率地震数据生成VP和VS模型.
- 开发了基于地震速度和地组成的过量束水模型.
- 分析了海底扩散的部分,区分了岩强型和岩贫穷型.
主要成果:
- 大西洋地的水合水平非常可变.
- 强烈蛇形化的岩石,在缺岩的部分普遍存在,占结合水的大部分.
- 蛇形化石含水量是正常岩地的四倍.
结论:
- 蛇形化岩石显著增加了大西洋海洋地可供沉降的结合水预算.
- 该研究估计,由于蛇形化,大西洋潜水带水预算增加了50%左右.
- 这些发现对了解过去的地质事件有意义,例如超大陆的分裂,当时缓慢扩散的地沉降更频繁.
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