分化行星体记录了内部和外部太阳系材料中硫的不同来源
Elizabeth A Heiny1, Edward M Stolper1, John M Eiler1
1Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125.
石中的硫同位素异常揭示了非碳和碳材料的独特特征. 这项研究追踪了太阳系早期的积累,表明地球是地球.
科学领域:
- 宇宙化学和行星科学 宇宙化学和行星科学
- 同位素地球化学 同位素地球化学
- 太阳系早期的进化过程
背景情况:
- 地球外物质中的同位素异常可以追溯到太阳系早期的物质分布.
- 硫 (S) 是生命必不可少的挥发性元素,具有质量独立的同位素组成.
- 差异化石提供了对行星天体S同位素组成的洞察.
研究的目的:
- 为了将同位素异常框架扩展到地外物质中的硫 (S).
- 为了研究非碳 (NC) 和碳 (CC) 流星的S同位素组成 (Δ33S和Δ36S).
- 确定NC和CC材料对地球硫预算的贡献.
主要方法:
- 在差异化石中分析质量独立的硫同位素组成 (Δ33S和Δ36S).
- 在NC和CC铁石和NC石之间比较S同位素数据.
- 基于石同位素数据的陆地硫积的建模.
主要成果:
- 在NC和CC铁石中,有不同的平均Δ33S值 (Δ33SNC = 0.013 ± 0.003‰; Δ33SCC = -0.021 ± 0.009‰).
- 在NC的S同位素组合与NC铁的S同位素组合重叠,与其他核合成异常相关.
- 据估计,地球的硫预算约为NC材料的76%和CC材料的24%.
结论:
- 石中的硫同位素异常为了解早期太阳系积累提供了强大的工具.
- 不同的NC和CC材料的S同位素特征反映了它们的单独起源或加工.
- 大多数地球的硫是由非碳的前体提供.
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