对地球和行星组成的物理化学控制
Paolo A Sossi1, Remco C Hin2, Thorsten Kleine3
1Institute of Geochemistry and Petrology, ETH Zürich, Clausiusstrasse 25, CH-8092 Zürich, Switzerland.
概括
陆地行星是氧化和挥发不良的,与太阳星云凝结物不同. 这表明行星不是从平衡缩物中形成的,也不是经历了稍后的挥发性耗尽和氧化. 地球 地球 地球 地球 地球 地球
科学领域:
- 行星科学 行星科学
- 天体化学是天体化学.
- 地质化学 地质化学
背景情况:
- 陆地行星的质量成分偏离了正规的太阳星云凝结物.
- 行星核心建立高氧气流动性 (fO2),大小数量高于星云气体.
- 氧化后的陆地行星有悖论地耗尽了挥发性元素.
研究的目的:
- 研究陆地行星的形成条件和组成.
- 为了使星球的氧化但挥发性较差的性质与星云化学相协调.
- 确定对地球独特组成负责的原材料和过程.
主要方法:
- 在不同温度下从正规太阳能气体中缩物成分的热力学建模.
- 在陆地物体和石中分析Fe/O比率和挥发性元素的丰度.
- 对同位素组成 (Cr,Ti) 的评估,以追踪增量成分.
主要成果:
- 在典型的形成温度下,星云凝结物产生的Fe/O比率低于地球.
- 氧化条件预计与挥发性缩相关,与观察相反.
- 小物体 (月球,维斯塔) 表明通过蒸发/凝结流失挥发性物质;较大的物体 (地球,火星) 显示混合起源,具有潜在的挥发性未耗尽成分.
结论:
- 行星可能不是从平衡星云凝聚物中形成的,也不是经历了星云后处理.
- 地球的组成可能涉及一个缺失,氧化和挥发性贫乏 (NC类) 储备的显著贡献.
- 内部太阳系天体的氧化和挥发性较差的性质很可能是它们构成材料的内在特征.
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