在2005年阿法海域水事件中,在大陆断裂时,岩维持了裂细分
Tim J Wright1, Cindy Ebinger, Juliet Biggs
1Department of Earth Sciences, University of Oxford, Oxford OX1 3PR, UK. t.wright@see.leeds.ac.uk
Nature
|July 21, 2006
概括
通过堤而不是断层的岩入侵驱动着大陆裂的细分. 2005年达巴胡岩断层破裂显示,快速的岩注入启动了陆基裂分割.
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
- 火山学 火山学是一门学科.
背景情况:
- 海底扩散中心表现出正规的沿轴细分,归因于细分的岩供应.
- 大陆裂通常由正常断层划分,往往缺乏显著的岩,使安置过程不清楚.
研究的目的:
- 调查大陆断裂期间融化区位移的机制.
- 了解岩入侵在分割大陆裂中的作用.
主要方法:
- 使用2005年达巴胡裂变事件期间的卫星雷达数据分析三维变形场.
- 弹性建模以量化变形和地震破裂贡献.
- 地震数据分析,以确定岩入侵的时间和程度.
主要成果:
- 整个60公里长的Dabbahu岩石段破裂,代表了卫星地质测量记录的最大的大陆事件.
- 沿着一个深度在2-9公里之间的堤注入了岩,其体积约为2.5公里3.
- 地震破裂仅占观察到的变形的8%,表明岩压力是主要的驱动因素.
结论:
- 通过堤的岩入侵,而不是细分的正常断层,是该部门维持和启动沿轴细分的首要过程.
- 在不到一周的时间内发生的Dabbahu堤防的快速入侵,突出了大陆裂中岩细分的动态性质.
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