at Google ScholarTitle data
Rustioni, Greta ; Wiedenbeck, M. ; Miyajima, Nobuyoshi ; Chanyshev, Artem ; Keppler, Hans:
Magnesiowüstite as a major nitrogen reservoir in Earth's lowermost mantle.
In: Geochemical Perspectives Letters.
Vol. 28
(2024)
.
- pp. 43-47.
ISSN 2410-3403
DOI: https://doi.org/10.7185/geochemlet.2401
Abstract in another language
Ferropericlase (Mg,Fe)O is after bridgmanite the most abundant phase in the lower mantle. The ultralow velocity zones above the core-mantle boundary may contain very Fe-rich magnesiowüstite (Fe,Mg)O, possibly as result of the fractional crystallisation of a basal magma ocean. We have experimentally studied the solubility of nitrogen in the ferropericlase-magnesiowüstite solid solution series as function of iron content. Multi-anvil experiments were performed at 20–33 GPa and 1600–1800 °C in equilibrium with Fe metal. Nitrogen solubility increases from a few tens ppm (μg/g) for Mg-rich ferropericlase to more than 10 wt. % for nearly pure wüstite. Such high solubilities appear to be due to solid solution with NiAs-type FeN. Our data suggest that during fractional crystallisation of a magma ocean, the core-mantle boundary would have become extremely enriched with nitrogen, such that the deep mantle today could be the largest nitrogen reservoir on Earth. The often discussed “subchondritic N/C” ratio of the bulk silicate Earth may be an artefact of insufficient sampling of this deep reservoir.
Further data
| Item Type: | Article in a journal |
|---|---|
| Refereed: | Yes |
| Institutions of the University: | Research Institutions > Central research institutes > Bavarian Research Institute of Experimental Geochemistry and Geophysics - BGI |
| Result of work at the UBT: | Yes |
| DDC Subjects: | 500 Science > 550 Earth sciences, geology |
| Date Deposited: | 12 Nov 2024 06:23 |
| Last Modified: | 12 Nov 2024 06:23 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/91010 |