海洋中山脉火山的深层根源由化物宿主融化的内涵揭示
Emma N Bennett1, Frances E Jenner2, Marc-Alban Millet3
1School of Earth and Ocean Sciences, Cardiff University, Cardiff, UK. bennette7@cardiff.ac.uk.
Nature
|August 9, 2019
概括
中洋山脊火山可能有很深的岩根. 化含有更高的结晶压力比化含有更高的结晶压力,这表明岩室扩展到更深的岩层地幔.
科学领域:
- 地质学
- 火山学
- 地质化学
背景情况:
- 中洋山脊是地球火山活动的75%主体,但它们的岩系统的垂直范围仍有争议.
- 之前使用橄含含的研究表明,中海岩的结晶深度很浅 (<9公里).
- 基于奥利文的压力估计与石化层厚度的地质数据之间存在差异.
研究的目的:
- 为了研究化深度的岩石养中海山脉火山.
- 为了比较奥利文和酸的融化含量数据,以解决压力估计的差异.
- 为了确定岩系统的垂直范围在超慢扩散的Gakkel中海山脊.
主要方法:
- 在含有橄素和青酸盐的融物中,对挥发性元素含量的比较分析.
- 使用融化的含量作为天然压力表来估计岩结晶的压力.
- 将压力估计与岩层厚度和地球物理数据相关联.
主要成果:
- 化物含有化物含有化物含有化物含有化物含有化物含有化物含有化物含有化物含有化物含有化物含有化物含有化物含有化物含有化物含有化物含有化物含有化物含有化物含有化物含有化物含有化物含有化物含有化物含有化物含有化物含有化物含有化物含有化物含有.
- 记录的最高压力相当于海底下16.4公里的深度.
- 这些更深的估计与Gakkel中海山脊和玻璃组成数据的岩层厚度一致.
结论:
- 中洋山脊火山,特别是在超慢扩散的山脊,可以有深层岩石根源延伸到岩层地幔.
- 与橄酸为宿主的含物相比,含物为宿主的含物提供了更准确的深度结晶压力估计.
- 这一发现挑战了以前关于中海岩系统垂直扩展的假设.
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