含有的铁过氧化物和超低速度区域的起源
Jin Liu1, Qingyang Hu1,2, Duck Young Kim2
1Department of Geological Sciences, Stanford University, Stanford, California 94305, USA.
Nature
|November 24, 2017
概括
含的铁过氧化物 (FeO2Hx) 解释了地球的超低速度区域 (ULVZ). 这种密集的物质是由铁和水的反应形成的,
科学领域:
- 地质学
- 矿物物理
- 星球科学
背景情况:
- 核心-地幔边界的超低速度区域 (ULVZ) 对地球结构的起源和影响尚不清楚.
- 在最低的地幔条件下,具有的铁过氧化物 (FeO2Hx) 是稳定的.
研究的目的:
- 在核心-地幔边界条件下研究含铁过氧化物 (FeO2Hx) 的特性.
- 确定FeO2Hx是否可以解释ULVZ的地震特征和形成.
主要方法:
- 高压实验研究.
- 理论上的计算.
- 对地震数据的分析.
主要成果:
- 铁过氧化物 (FeO2Hx) 具有高密度,高波桑比率和极低的声速,与ULVZ一致.
- 铁与水在86 GPa和2200 K的反应产生FeO2Hx.
- 这种反应提供了一个可信的ULVZ形成的机制,使用水和核心铁.
结论:
- 含的铁过氧化物 (FeO2Hx) 是 ULVZ 的强烈候选物.
- 水对铁的超氧化提供了ULVZ在核心-地幔边界的直接形成机制.
- 这一发现解决了 ULVZ 的起源争论,
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