Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/13808
DC Field | Value | Language |
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dc.date.accessioned | 2020-10-19T06:47:45Z | - |
dc.date.available | 2020-10-19T06:47:45Z | - |
dc.date.issued | 2020 | - |
dc.identifier.uri | http://hdl.handle.net/2122/13808 | - |
dc.description.abstract | 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 unclear1-6. Here we show that the mantle may have retained remnants of such primordial nitrogen. We use the rare 15N15N isotopologue of N2 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 δ15N (the fractional difference in 15N/14N from air), N2/36Ar and N2/3He. Our results show that negative δ15N values observed in gases, previously regarded as indicating a mantle origin for nitrogen7-10, in fact represent dominantly air-derived N2 that experienced 15N/14N fractionation in hydrothermal systems. Using two-component mixing models to correct for this effect, the 15N15N data allow extrapolations that characterize mantle endmember δ15N, N2/36Ar and N2/3He values. We show that the Eifel region has slightly increased δ15N and N2/36Ar values relative to estimates for the convective mantle provided by mid-ocean-ridge basalts11, consistent with subducted nitrogen being added to the mantle source. In contrast, we find that whereas the Yellowstone plume has δ15N values substantially greater than that of the convective mantle, resembling surface components12-15, its N2/36Ar and N2/3He 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 δ15N values may both be dominantly primordial features. | en_US |
dc.language.iso | English | en_US |
dc.publisher.name | Nature P. G. | en_US |
dc.relation.ispartof | Nature | en_US |
dc.relation.ispartofseries | /580 (2020) | en_US |
dc.title | Hydrothermal 15N15N abundances constrain the origins of mantle nitrogen | en_US |
dc.type | article | en |
dc.description.status | Published | en_US |
dc.description.pagenumber | 367–371 | en_US |
dc.identifier.doi | 10.1038/s41586-020-2173-4 | en_US |
dc.description.obiettivoSpecifico | 3V. Proprietà chimico-fisiche dei magmi e dei prodotti vulcanici | en_US |
dc.description.journalType | JCR Journal | en_US |
dc.contributor.author | Labidi, J | - |
dc.contributor.author | Barry, Peter H. | - |
dc.contributor.author | Bekaert, David V | - |
dc.contributor.author | Broadley, Michael w | - |
dc.contributor.author | Marty, Bernard | - |
dc.contributor.author | Giunta, G. | - |
dc.contributor.author | Warr, O. | - |
dc.contributor.author | Sherwood Lollar, Barbara | - |
dc.contributor.author | Fischer, Tobias P. | - |
dc.contributor.author | Avice, Guillaume | - |
dc.contributor.author | Caracausi, Antonio | - |
dc.contributor.author | Ballentine, Christopher J. | - |
dc.contributor.author | Halldórsson, Sæmundur Ari | - |
dc.contributor.author | Stefánsson, Andri | - |
dc.contributor.author | Kurz, M D | - |
dc.contributor.author | Kohl, I.E. | - |
dc.contributor.author | Young, E. D. | - |
dc.contributor.department | Department of Earth, Planetary, and Space Sciences, UCLA, Los Angeles | en_US |
dc.contributor.department | Marine Chemistry and Geochemistry Department, Woods Hole Oceanographic Institution, Woods Hole | en_US |
dc.contributor.department | Centre de Recherches Pétrographiques et Géochimiques, CNRS, Université de Lorraine, Vandoeuvre les Nancy, | en_US |
dc.contributor.department | Centre de Recherches Pétrographiques et Géochimiques, CNRS, Université de Lorraine, Vandoeuvre les Nancy, | en_US |
dc.contributor.department | Centre de Recherches Pétrographiques et Géochimiques, CNRS, Université de Lorraine, Vandoeuvre les Nancy, | en_US |
dc.contributor.department | Department of Earth Sciences, University of Toronto | en_US |
dc.contributor.department | Department of Earth Sciences, University of Toronto | en_US |
dc.contributor.department | Department of Earth Sciences, University of Toronto | en_US |
dc.contributor.department | University of New Mexico | en_US |
dc.contributor.department | Université de Paris | en_US |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Palermo, Palermo, Italia | en_US |
dc.contributor.department | Department of Earth Sciences, University of Oxford | en_US |
dc.contributor.department | Nordvulk, Institute of Earth Sciences, University of Iceland, | en_US |
dc.contributor.department | Nordvulk, Institute of Earth Sciences, University of Iceland, | en_US |
dc.contributor.department | Pétrographiques et Géochimiques, CNRS, Université de Lorraine, Vandoeuvre les Nancy, | en_US |
dc.contributor.department | Department of Earth, Planetary, and Space Sciences, UCLA, Los Angeles | en_US |
dc.contributor.department | Department of Earth, Planetary, and Space Sciences, UCLA, Los Angeles | en_US |
item.openairetype | article | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.grantfulltext | restricted | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | Department of Earth, Planetary, and Space Sciences, UCLA, Los Angeles | - |
crisitem.author.dept | CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA | - |
crisitem.author.dept | Centre de Recherches Pétrographiques et Géochimiques, UMR 7358 CNRS – Université de Lorraine, 15 rue Notre Dame des Pauvres, BP 20, 54501 Vandoeuvre-lès-Nancy, France | - |
crisitem.author.dept | Dipartimento di Geologia e Geodesia, Università degli Studi di Palermo, Italy | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Palermo, Palermo, Italia | - |
crisitem.author.dept | Pétrographiques et Géochimiques, CNRS, Université de Lorraine, Vandoeuvre les Nancy, | - |
crisitem.author.orcid | 0000-0002-5031-4687 | - |
crisitem.author.orcid | 0000-0001-7936-1519 | - |
crisitem.author.orcid | 0000-0003-0962-0049 | - |
crisitem.author.orcid | 0000-0003-2510-2890 | - |
crisitem.author.orcid | 0000-0002-4724-8578 | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
Appears in Collections: | Article published / in press |
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Labidi et al., 2020_Nature.pdf | 3.4 MB | Adobe PDF |
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