整个的对流和过渡区的水过器
David Bercovici1, Shun-Ichiro Karato
1Department of Geology and Geophysics, Yale University, PO Box 208109, New Haven, Connecticut 06520-8109, USA. david.bercovici@yale.edu
Nature
|September 5, 2003
概括
地球的地幔可能没有孤立的水库. 相反,在410公里不连续的水过器模型解释了玄武岩的地化学差异,协调了地质和地物理数据.
科学领域:
- 地质化学 地质化学
- 地质物理学 地质物理学
- 地幔石化学地幔石化学
背景情况:
- 海洋岛基岩 (OIB) 和中海基岩 (MORB) 的独特化学特征传统上表明隔离的地幔储库.
- 现有的地幔水库模型与地球化学数据保持一致,但与地球物理观测相冲突.
研究的目的:
- 为基岩岩形成提出一个替代模型.
- 用地幔过机制来解释玄武岩的地化学变化.
- 在地幔研究中协调地质化学和地质物理差异.
主要方法:
- 在410公里不连续的地幔过程的概念建模.
- 脱水引起的部分融和元素过的分析.
- 假设在地幔过渡区中水溶性的作用.
主要成果:
- 提出了一个过渡区水过器模型,在410公里的脱水引起的融化将不兼容的元素分开.
- 过的,干燥的地幔上升,形成MORB源.
- 丰富的融残留物被困在410公里的不连续性,可能会影响OIB来源和早期地形成.
结论:
- 过渡区水过器模型为OIB和MORB的地化学特征提供了统一的解释.
- 这个模型解决了地质化学和地质物理数据之间的冲突,挑战了隔离地幔水库概念.
- 该模型还解释了OIB和早期大陆地的丰富特征,以及Archaean地幔过程中的变化.
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