气候变化领域集成服务门户(CCPortal): Selenium isotopes as tracers of a late volatile contribution to Earth from the outer Solar System

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DOI	10.1038/s41561-019-0414-7
	Selenium isotopes as tracers of a late volatile contribution to Earth from the outer Solar System
	Varas-Reus M.I.; König S.; Yierpan A.; Lorand J.-P.; Schoenberg R.
发表日期	2019
ISSN	17520894
卷号	12 期号:9
英文摘要	The origin of Earth’s volatiles has been attributed to a late addition of meteoritic material after core–mantle differentiation. The nature and consequences of this ‘late veneer’ are debated, but may be traced by isotopes of the highly siderophile, or iron-loving, and volatile element selenium. Here we present high-precision selenium isotope data for mantle peridotites, from double spike and hydride-generation multicollector inductively coupled plasma mass spectrometry. These data indicate that the selenium isotopic composition of peridotites is unaffected by petrological processes, such as melt depletion and melt-rock reaction, and thus a narrow range is preserved that is representative of the silicate Earth. We show that selenium isotopes record a signature of late accretion after core formation and that this signature overlaps only with that of the CI-type carbonaceous chondrites. We conclude that these isotopic constraints indicate the late veneer originated from the outer Solar System and was of lower mass than previously estimated. Thus, we suggest a late and highly concentrated delivery of volatiles enabled Earth to become habitable. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	accretion; core-mantle boundary; Earth; isotopic analysis; isotopic composition; melt; meteorite; petrology; selenium; solar system; tracer; volatile substance
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/124612
作者单位	Isotope Geochemistry, Department of Geosciences, University of Tuebingen, Tuebingen, Germany; Laboratoire de Planétologie et Géodynamique à Nantes, CNRS UMR 6112, Université de Nantes, Nantes, France
推荐引用方式 GB/T 7714	Varas-Reus M.I.,König S.,Yierpan A.,et al. Selenium isotopes as tracers of a late volatile contribution to Earth from the outer Solar System[J],2019,12(9).
APA	Varas-Reus M.I.,König S.,Yierpan A.,Lorand J.-P.,&Schoenberg R..(2019).Selenium isotopes as tracers of a late volatile contribution to Earth from the outer Solar System.Nature Geoscience,12(9).
MLA	Varas-Reus M.I.,et al."Selenium isotopes as tracers of a late volatile contribution to Earth from the outer Solar System".Nature Geoscience 12.9(2019).