在酸盐地球中,S,Se和Te的比例需要富含挥发物质的晚期层
1Freie Universität Berlin, Institut für Geologische Wissenschaften, Malteserstrasse 74-100, 12249 Berlin, Germany. zaicongwang@gmail.com
Nature
|July 23, 2013
概括
地球的地幔含有硫,和的比例与碳酸合金相匹配,这表明这些挥发性物质是由"晚期层"提供的. 这种晚期涂层可能对地球的气和碳预算做出了重大贡献.
科学领域:
- 地质化学 地质化学
- 行星科学 行星科学
- 太空化学 太空化学
背景情况:
- 地球的大量酸盐地球 (BSE) 构成,特别是其高度 siderophile 元素 (HSEs),表明在核心形成后,一个 chondritic'晚期面膜'的增积.
- 这个晚期层中的挥发物对于理解地球的挥发性预算和起源至关重要.
- 素元素 (硫,,) 在高压和高温下具有中度至高度的 siderophile 性,因此它们的地幔丰度表明了晚期面膜的挥发性组成.
研究的目的:
- 为了确定地球地幔中硫 (S), (Se) 和 (Te) 的比例和丰度.
- 为了限制地球积累的晚期贴面的挥发性成分.
- 评估晚期层对地球气和碳预算的贡献.
主要方法:
- 对阿凯时后地幔内矿石的同位素稀释分析.
- 在地幔样本中确定S,Se和Te的比率和丰度.
- 对地幔石质素比率与体石组成 (CI,CM,普通,静态) 的比较.
主要成果:
- 地石中的平均S/Se和Se/Te比率与CI碳酸二烯酸盐的值保持一致.
- 常规和静态地铁中的Se/Te比率与地幔值有很大差异.
- 在BSE中,石灰/HSE的比率类似于CM碳酸.
结论:
- 牛脊髓灰质炎的HSE标志表明,主要的贡献来自挥发性贫乏的碳酸地铁状物质.
- 地幔的石化物组成支持了地球挥发性增积的晚期面层模型.
- 晚期面膜可能提供了地球20-100%的和碳,这取决于丰富的估计.
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