Heavy Nitrogen in Carbonatites of the Kola Peninsula: A Possible Signature of the Deep Mantle-Reference-Cited by-同舟云学术

Heavy Nitrogen in Carbonatites of the Kola Peninsula: A Possible Signature of the Deep Mantle

Published:1999-12-24 Issue:5449 Volume:286 Page:2488-2490
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Dauphas Nicolas¹,Marty Bernard¹²

Affiliation:

1. Centre de Recherches Pétrographiques et Géochimiques, CNRS UPR 9046, 15 rue Notre-Dame des Pauvres, Boı̂te Postale 20, 54501 Vandoeuvre-lès-Nancy Cedex, France.

2. Ecole Nationale Supérieure de Géologie, rue du doyen Marcel Roubault, Boı̂te Postale 40, 54501 Vandoeuvre-lès-Nancy Cedex, France.

Abstract

Nitrogen and argon isotopes were measured in carbonatites and associated rocks from the Kola Peninsula in Russia. The Kola mantle source, which is thought to be located in the deep mantle, is enriched in heavy nitrogen (+3 per mil relative to air) as compared to Earth's surface (atmosphere and crust, +2 per mil) and the shallow mantle (–4 per mil). Recycling of oceanic crust (+6 per mil) or metal-silicate partitioning may account for the nitrogen isotopic composition of the deep mantle.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference65 articles.

1. In the mantle 3 He and 22 Ne are mainly primordial in origin (they were trapped in our planet at the time of its accretion) whereas 4 He and 21 Ne have been produced throughout Earth's history. Less degassed reservoirs exhibit low time-integrated (U+Th)/ 3 He and (U+Th)/ 22 Ne ratios and consequently low 4 He/ 3 He ratios [

2. Helium isotopic systematics of oceanic islands and mantle heterogeneity

3. ] and 21 Ne/ 22 Ne ratios [

4. Possible solar noble-gas component in Hawaiian basalts

5. Evidence for deep mantle circulation from global tomography

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