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可变的水输入控制了小安提勒斯火山弧的演变
George F Cooper1,2, Colin G Macpherson3, Jon D Blundy4
1School of Earth Sciences, University of Bristol, Bristol, UK. CooperG3@cardiff.ac.uk.
Nature
|June 26, 2020
概括
在小安提利斯的火山弧中,水化地幔岩石是主要的水源. 这种深水极大地影响了火山活动,地震和地的演变.
科学领域:
- 地质化学
- 地质学
- 石油学
背景情况:
- 海洋石化层通过沉积将水输入地幔.
- 潜水影响了岩的产生,地震性和大陆地的形成.
- 在潜伏区追踪深层流体来源是复杂的.
研究的目的:
- 调查小安提尔群岛火山弧中的水源.
- 确定水分在弧形演变中的作用和相关的危险.
- 与地震和火山活动相关联的潜水板结构和水分.
主要方法:
- 在融物中分析微量元素和同位素指纹.
- 结合地质化学和地质物理数据的多学科方法.
- 作为不均水分的关键例子,研究了大西洋潜水带.
主要成果:
- 蛇形 (水化地幔) 是中部小安提尔群岛中沉积水的主要来源.
- 在过去的1000万年中形成的断裂区域是这种蛇形的可能宿主.
- 破裂区域的当前脱水与高地震性和低切割速度相关.
- 过去的脱水事件与增加的火山生产力和更厚的弧相吻合.
结论:
- 压缩板结构和水化直接控制弧形的演变.
- 深水循环,特别是水化地幔,在弧形岩和地震性中起着关键作用.
- 了解俯冲区的水分是评估火山和地震风险的关键.
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