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东太平洋海底扩散事件的动态
Yen Joe Tan1, Maya Tolstoy1, Felix Waldhauser1
1Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York 10964, USA.
Nature
|November 15, 2016
概括
海底在快速扩散的山脊上扩散的原因是构造压力, 不仅是岩压力. 这种压力引发了岩运动和喷发,
科学领域:
- 地质学
- 构造学
- 海洋学
背景情况:
- 海底的扩散主要是未被观察到的,主要发生在海中山脊的水下.
- 从陆地观测中推断出被地幔羽毛影响的缓慢扩散的中心.
- 岩压力和构造压力在海底扩散中的相互作用仍然不清楚.
研究的目的:
- 研究岩压力和构造压力在海底扩散中的作用.
- 在快速扩散的山脊上分析喷发的发起和传播.
主要方法:
- 使用地震观测来监测东太平洋上升的喷发.
- 分析了与岩运动和喷发相关的地震事件的空间范围和时间.
主要成果:
- 喷发开始于一个小的,丰富的融化部分,并由于应力变化而扩散.
- 由于关键的构造应力,山脊轴的很大一部分 (至少35公里) 发生了破裂.
- 岩在48小时内从多个孤立的岩镜片中喷发出来,
结论:
- 构造压力在海底迅速扩散的山脊中起着重要作用,即使这些山脊有充足的岩.
- 这些发现挑战了岩过度压力是传播的唯一驱动力.
- 这项研究提供了对中海演变的动态过程的关键见解.
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