热水风口温度跟踪岩膨胀和预测喷发在东太平洋上升,9°50'N
Thibaut Barreyre1,2, Jean-Arthur Olive3, Daniel J Fornari2
1Geo-Ocean, Univ Brest, CNRS, Ifremer, UMR6538, Plouzané F-29280, France.
概括
东太平洋上升的热水风口温度显示了与轴性岩透镜 (AML) 膨胀相关的十年波动. 这些长期数据提供了对中洋山脊岩过程和火山爆发预测的洞察.
科学领域:
- 地质化学和地质物理学
- 海洋学 海洋学 海洋学
- 火山学 火山学是一门学科.
背景情况:
- 热水风口温度因海洋中山脊 (MORs) 的岩石和构造活动而波动,影响地球和海洋的能量交换.
- 之前对这些波动的观察仅限于短时间 (分钟到几年),因为长期数据稀缺.
研究的目的:
- 分析来自东太平洋上升轴上的五个热水喷口的35年温度记录.
- 了解热水风口温度变化与潜在的岩过程之间的关系.
主要方法:
- 组装了来自五个热水喷口的35年出口流体温度的时间序列.
- 使用实验室确定的压力-透率关系来解释温度趋势.
- 与地表皮层变形的地质观测相关联的温度数据.
主要成果:
- 观察到最大通风温度从~350°C到~390°C (1991-92年至2005-06年) 稳步增加.
- 在2005-06年爆发后,气温下降,自那以后一直在上升.
- 估计地压缩率为0.38 MPa/年 (1992-2005) 和0.33 MPa/年 (2006 年后).
结论:
- 热水风口温度的十年性波动反映了轴性岩透镜 (AML) 压缩率.
- 这为MORs的岩补充和喷发动态提供了新的约束.
- 温度时间序列对于预测2025年4月火山爆发至关重要.
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