氧化的高压形式
Masayuki Nishi1,2, Yasuhiro Kuwayama1,3, Jun Tsuchiya1,2
1Geodynamics Research Center, Ehime University, 2-5 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan.
Nature
|July 6, 2017
概括
通过俯冲进入地球内部的水可以到达核心-地幔边界. 新的研究揭示了深层下层地幔中稳定的类FeOOH阶段,有可能将运送到外核.
科学领域:
- 地质学
- 矿物物理
- 地质化学
背景情况:
- 沉积水会影响地球的深层动态,包括火山活动和板块构造.
- 水性矿物被认为在深部是稳定的,但在中低层的地幔中报告了石的分解.
- 这种分解表明气迁移和氧气再分配.
研究的目的:
- 在深层地幔条件下研究氧化氧化铁 (FeOOH) 阶段的稳定性.
- 为了澄清水性矿物在深度沉降过程中的行为.
- 了解水和的潜在运输到地球的核心.
主要方法:
- 基本原则的计算.
- 在现场进行X射线衍射实验.
主要成果:
- 在下层地幔的底部有一个新的,密集的Pyrite类型FeOOH阶段.
- 这个阶段比周围的地幔材料密度更高.
- 深层化物类型的FeOOH分解为Fe2O3,并在地幔底部加热时释放H2O.
结论:
- 矿类型FeOOH的稳定性挑战了先前的地幔内矿分解模型.
- 这一阶段可能会融入潜水板和带状铁层.
- 在核心-地幔边界的FeOOH解离可能导致作为铁化物 (FeHx) 融入外核.
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