有证据表明,地球的外核中缺氧的液体
Haijun Huang1, Yingwei Fei, Lingcang Cai
1School of Sciences, Wuhan University of Technology, Wuhan, Hubei 430070, China.
Nature
|November 25, 2011
概括
氧不是地球液态外核中的主要光元素. 新的冲击波数据表明,铁合金中的氧气不符合核心的观测密度和声速概况.
科学领域:
- 地质物理学 地质物理学
- 宇宙化学 宇宙化学
- 高压实验物理高压实验物理
背景情况:
- 地球的液态外核主要是铁合金,含有约10%的轻元素.
- 这些轻元素影响核心冷却,内核生长,对流和地力发电机演变.
- 由于宇宙化学论证和积累化学,氧被认为是主要的光元素.
研究的目的:
- 为了研究氧气作为地球液态外核中主要的光元素的作用.
- 将新的实验数据与外核的地球物理观测进行比较.
- 限制地球核心的组成以及对早期地球条件的影响.
主要方法:
- 收集了用于铁-硫-氧 (Fe-S-O) 系统的新冲击波数据.
- 在高压条件下测量Fe-S-O合金的密度和声速.
- 将实验数据与地球液态外核的地物理概况进行比较.
主要成果:
- 对于Fe-S-O合金的实验数据与液体外核的观察到的密度和声速配置文件同时不匹配.
- 在这些条件下,氧不能成为液态外核中的一个主要的轻元素.
- 这些发现排除了氧气作为核心轻元素混合物中占主导地位的成分.
结论:
- 氧气不太可能是地球液态外核中的一个主要的轻元素.
- 一个缺氧的核心表明,在早期的地球积累过程中,环境更为减少.
- 需要进一步的研究来确定构成地球核心的精确光元素.
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