DOI: 10.1038/s41561-021-00733-0
论文题名: Rates of protoplanetary accretion and differentiation set nitrogen budget of rocky planets
作者: Grewal D.S. ; Dasgupta R. ; Hough T. ; Farnell A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2021
卷: 14, 期: 6 起始页码: 369
结束页码: 376
语种: 英语
英文关键词: accretion
; differentiation
; high pressure
; high temperature
; Mars
; Moon
; partial pressure
; solar system
; Asteroidea
英文摘要: The effect of protoplanetary differentiation on the fate of life-essential volatiles such as nitrogen and carbon and its subsequent effect on the dynamics of planetary growth is unknown. Because the dissolution of nitrogen in magma oceans depends on its partial pressure and oxygen fugacity, it is an ideal proxy to track volatile redistribution in protoplanets as a function of their sizes and growth zones. Using high-pressure/temperature experiments in graphite-undersaturated conditions, here we show that the siderophilic (iron-loving) character of nitrogen is an order of magnitude higher than previous estimates across a wide range of oxygen fugacity. The experimental data combined with metal–silicate–atmosphere fractionation models suggest that asteroid-sized protoplanets, and planetary embryos that grew from them, were nitrogen depleted. However, protoplanets that grew to planetary embryo size before undergoing differentiation had nitrogen-rich cores and nitrogen-poor silicate reservoirs. Bulk silicate reservoirs of large Earth-like planets obtained nitrogen from the cores of the latter type of planetary embryos. Therefore, to satisfy the volatile budgets of Earth-like planets during the main stage of their growth, the timescales of planetary embryo accretion had to be shorter than their differentiation timescales; that is, Moon- to Mars-sized planetary embryos grew rapidly within ~1–2 Myrs of the Solar System’s formation. © 2021, The Author(s), under exclusive licence to Springer Nature Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169755
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth, Environmental, and Planetary Sciences, Rice University, Houston, TX, United States; St. John’s School, Houston, TX, United States
Recommended Citation:
Grewal D.S.,Dasgupta R.,Hough T.,et al. Rates of protoplanetary accretion and differentiation set nitrogen budget of rocky planets[J]. Nature Geoscience,2021-01-01,14(6)