Hydrothermal (NN)-N-15-N-15 abundances constrain the origins of mantle nitrogen

doi:10.1038/s41586-020-2173-4

GSTDTAP > 地球科学

DOI	10.1038/s41586-020-2173-4
	Hydrothermal (NN)-N-15-N-15 abundances constrain the origins of mantle nitrogen
	Zhao, Steven 1,2,3; Jang, Cholsoon 4,5; Liu, Joyce 1,2,6; Uehara, Kahealani 6,7,8; Gilbert, Michael 1,2,6; Izzo, Luke 1,2,3; Zeng, Xianfeng 4,5; Trefely, Sophie 1,2,9; Fernandez, Sully 1,2; Carrer, Alessandro 1,2,12; Miller, Katelyn D.10; Schug, Zachary T.10; Snyder, Nathaniel W.9; Gade, Terence P.1,11; Titchenell, Paul M.7,8; Rabinowitz, Joshua D.4,5; Wellen, Kathryn E.1,2,8
	2020-04-15
发表期刊	NATURE
ISSN	0028-0836
EISSN	1476-4687
出版年	2020
卷号	580 期号:7803 页码:367-+
文章类型	Article
语种	英语
国家	USA; France; Canada; Italy; England; Iceland; Germany
英文关键词	Nitrogen is the main constituent of the Earth' s atmosphere, but its provenance in the Earth' s mantle remains uncertain. The relative contribution of primordial nitrogen inherited during the Earth' s accretion versus that subducted from the Earth' s surface is unclear(1-6). Here we show that the mantle may have retained remnants of such primordial nitrogen. We use the rare (NN)-N-15-N-15 isotopologue of N-2 as a new tracer of air contamination in volcanic gas effusions. By constraining air contamination in gases from Iceland, Eifel (Germany) and Yellowstone (USA), we derive estimates of mantle delta N-15 (the fractional difference in N-15/N-14 from air), N-2/Ar-36 and N-2/He-3. Our results show that negative delta N-15 values observed in gases, previously regarded as indicating a mantle origin for nitrogen(7-10), in fact represent dominantly air-derived N-2 that experienced N-15/N-14 fractionation in hydrothermal systems. Using two-component mixing models to correct for this effect, the (NN)-N-15-N-15 data allow extrapolations that characterize mantle endmember delta N-15, N-2/Ar-36 and N-2/He-3 values. We show that the Eifel region has slightly increased delta N-15 and N-2/Ar-36 values relative to estimates for the convective mantle provided by mid-ocean-ridge basalts(11), consistent with subducted nitrogen being added to the mantle source. In contrast, we find that whereas the Yellowstone plume has delta N-15 values substantially greater than that of the convective mantle, resembling surface components(12-15), its N-2/Ar-36 and N-2/He-3 ratios are indistinguishable from those of the convective mantle. This observation raises the possibility that the plume hosts a primordial component. We provide a test of the subduction hypothesis with a two-box model, describing the evolution of mantle and surface nitrogen through geological time. We show that the effect of subduction on the deep nitrogen cycle may be less important than has been suggested by previous investigations. We propose instead that high mid-ocean-ridge basalt and plume delta N-15 values may both be dominantly primordial features.
领域	地球科学 ; 气候变化 ; 资源环境
收录类别	SCI-E
WOS记录号	WOS:000530151300028
WOS关键词	MID-ATLANTIC RIDGE ; RARE-GAS SYSTEMATICS ; NOBLE-GASES ; ISOTOPIC COMPOSITION ; CARBONACEOUS CHONDRITES ; POPPING ROCKS ; CRUST ; FLUX ; SUBDUCTION ; AR
WOS类目	Multidisciplinary Sciences
WOS研究方向	Science & Technology - Other Topics
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引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/249213
专题	地球科学资源环境科学
作者单位	1.Univ Penn, Perelman Sch Med, Dept Canc Biol, Philadelphia, PA 19104 USA; 2.Univ Penn, Abramson Family Canc Res Inst, Perelman Sch Med, Philadelphia, PA 19104 USA; 3.Univ Penn, Cell & Mol Biol Grad Grp, Perelman Sch Med, Philadelphia, PA 19104 USA; 4.Princeton Univ, Dept Chem, Princeton, NJ 08544 USA; 5.Princeton Univ, Lewis Sigler Inst Integrat Genom, Princeton, NJ 08544 USA; 6.Univ Penn, Biochem & Mol Biophys Grad Grp, Perelman Sch Med, Philadelphia, PA 19104 USA; 7.Univ Penn, Dept Physiol, Perelman Sch Med, Philadelphia, PA 19104 USA; 8.Univ Penn, Inst Diabet Obes & Metab, Perelman Sch Med, Philadelphia, PA 19104 USA; 9.Temple Univ, Ctr Metab Dis Res, Dept Microbiol & Immunol, Lewis Katz Sch Med, Philadelphia, PA 19122 USA; 10.Wistar Inst Anat & Biol, Mol & Cellular Oncogenesis, 3601 Spruce St, Philadelphia, PA 19104 USA; 11.Univ Penn, Dept Radiol, Perelman Sch Med, Philadelphia, PA 19104 USA; 12.VIMM, Padua, Italy
推荐引用方式 GB/T 7714	Zhao, Steven,Jang, Cholsoon,Liu, Joyce,et al. Hydrothermal (NN)-N-15-N-15 abundances constrain the origins of mantle nitrogen[J]. NATURE,2020,580(7803):367-+.
APA	Zhao, Steven.,Jang, Cholsoon.,Liu, Joyce.,Uehara, Kahealani.,Gilbert, Michael.,...&Wellen, Kathryn E..(2020).Hydrothermal (NN)-N-15-N-15 abundances constrain the origins of mantle nitrogen.NATURE,580(7803),367-+.
MLA	Zhao, Steven,et al."Hydrothermal (NN)-N-15-N-15 abundances constrain the origins of mantle nitrogen".NATURE 580.7803(2020):367-+.