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DOI	10.1038/s41561-021-00733-0
	Rates of protoplanetary accretion and differentiation set nitrogen budget of rocky planets
	Grewal D.S.; Dasgupta R.; Hough T.; Farnell A.
发表日期	2021
ISSN	17520894
起始页码	369
结束页码	376
卷号	14 期号:6
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.
英文关键词	accretion; differentiation; high pressure; high temperature; Mars; Moon; partial pressure; solar system; Asteroidea
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206899
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
推荐引用方式 GB/T 7714	Grewal D.S.,Dasgupta R.,Hough T.,et al. Rates of protoplanetary accretion and differentiation set nitrogen budget of rocky planets[J],2021,14(6).
APA	Grewal D.S.,Dasgupta R.,Hough T.,&Farnell A..(2021).Rates of protoplanetary accretion and differentiation set nitrogen budget of rocky planets.Nature Geoscience,14(6).
MLA	Grewal D.S.,et al."Rates of protoplanetary accretion and differentiation set nitrogen budget of rocky planets".Nature Geoscience 14.6(2021).