地球上挥发性元素的积累不需要晚期层
Lucas Calvo1, Julien Siebert1, Dongyang Huang1,2
1Institut de Physique du Globe de Paris (IPGP), Université Paris Cité, Paris, France.
Science advances
|February 25, 2026
概括
硫,和等挥发性元素在地球的生长过程中不断地被输送,而不是主要是通过晚期层. 核心-地幔平衡保持了它们的自然丰度,这表明它们的早期积累.
科学领域:
- 行星科学 行星科学
- 地质化学 地质化学
- 天体生物学 天体生物学
背景情况:
- 挥发性元素对生命和行星进化至关重要,但它们到达陆地行星的时间不确定.
- 硫,和是挥发性的,但仍然是 siderophile 元素,为地球的积累历史提供了洞察力.
- 它们的地幔丰富度可以揭示挥发性分娩是否发生在核心分离之前或之后.
研究的目的:
- 在深海岩条件下,实验性地确定硫,和在金属和酸盐相之间的分离行为.
- 评估核心-地幔平衡是否保持这些挥发性 siderophile 元素的体相对丰度.
- 为了限制任何潜在的挥发性元素向地球传递的迟层物质的质量.
主要方法:
- 对硫,和的分割系数进行实验测量.
- 在高压,温度和特定氧气流动性下模拟形成核心的金属和地幔酸盐相互作用.
- 重建了与深层陆地岩海洋相关的条件.
主要成果:
- 硫,和在金属和酸盐之间表现出类似的分割行为.
- 这些分区行为表明,核心-地幔平衡有效地保持了体的相对丰度.
- 一个分离后富含挥发性物质的晚期涂层将不到地球质量的0.1%.
结论:
- 挥发性元素,包括水,很可能在整个地球形成过程中不断增加.
- 主要的传递机制并不是像碳状地铁这样富含挥发性物质的晚期涂层.
- 核心-地幔相互作用在陆地行星中挥发性元素的分布中起着重要作用.
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