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从地幔地震折射数据中,在中洋山脊上融提取的扩散速率依赖性

Daniel Lizarralde¹, James B Gaherty, John A Collins

¹School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332, USA. danl@eas.gatech.edu

|December 14, 2004

概括

中洋山脊以较慢的传播速度产生较少的地. 这项研究表明,较慢的扩散通过在地幔中保留gabbroic物质,影响了融的提取,而不是完全融.

科学领域:

地质物理学地质物理学
海洋地质学海洋地质学
构造学构造学构造学构造学

背景情况:

中洋山脊在每年20毫米以下的传播速度下产生较少的海洋地.
导致这种减少的确切机制,例如由于更厚的热盖而减少浅或不完全取融,仍在争论中.

研究的目的:

为了研究中洋山脊的残余地幔结构的地震特性.
了解基本的脊过程如何随着传播速度的下降而发生变化,特别是从缓慢传播到超缓慢传播的过渡.

主要方法:

进行了一项地震折射实验,以图像地幔结构下一个中海山脊.
分析了地震速度梯度,地下室地形和地厚度.

主要成果:

观察到大量地幔地震性质的突然横向变化,与从缓慢到超缓慢的古老传播速率的转变相关.
记录了与这种传播速度变化相关的地幔速度梯度,地下室地形和地厚度的变化.

结论:

这些发现支持融提取的变化是减少地产量的首要原因,扩散速度较慢.
一个加布洛伊克阶段在地幔中以较慢的速度被优先保留,这解释了观察到的地厚度差异,并表明融的提取受到了影响,而不是完全融化.

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