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No V-Fe-Zn isotopic variation in basalts from the 2021 Fagradalsfjall eruption

Stow, M.A.; Prytulak, J.; Burton, K.W.; Nowell, G.M.; Marshall, E.W.; Halldórsson, S.A.; Matthews, S.; Rasmussen, M.B.; Ranta, E.; Caracciolo, A.

No V-Fe-Zn isotopic variation in basalts from the 2021 Fagradalsfjall eruption Thumbnail


Authors

K.W. Burton

G.M. Nowell

E.W. Marshall

S.A. Halldórsson

S. Matthews

M.B. Rasmussen

E. Ranta

A. Caracciolo



Abstract

The Earth’s mantle is chemically heterogeneous in space and time, which is often reflected by variable isotopic compositions of mantle derived basalts. Basalts from the first 40 days of the 2021 Fagradalsfjall eruption, Reykjanes Peninsula, Iceland, display systematic temporal variations in the ratios of incompatible elements alongside resolvable variations in Sr, Nd and Pb radiogenic isotopes. These variations reflect progressive influx of magma derived from melting of a deeper, more enriched and potentially lithologically distinct source. We use this eruptive time series to conduct the first combined V-Fe-Zn isotope study, exploring the sensitivity of the combined isotopic approach, with particular focus on fingerprinting source lithological heterogeneity. We find no analytically resolvable change in V (δ51VAA between −0.95 ± 0.09 ‰ 2 s.d. and −0.86 ± 0.07 ‰ 2 s.d.), Fe (δ56FeIRMM-524 between +0.047 ± 0.042 ‰ 2 s.d. and +0.094 ± 0.049 ‰ 2 s.d.) and Zn (δ66ZnAA-ETH between −0.042 ± 0.003 ‰ 2 s.d. and +0.013 ± 0.027 ‰ 2 s.d.) isotopic compositions. The lack of variability in V-Fe-Zn isotopes, despite the evolving trace element and radiogenic isotope ratios, suggests there is no significant contribution of melts from a lithologically distinct (pyroxenite) mantle component under the Reykjanes Peninsula.

Citation

Stow, M., Prytulak, J., Burton, K., Nowell, G., Marshall, E., Halldórsson, S., …Caracciolo, A. (2023). No V-Fe-Zn isotopic variation in basalts from the 2021 Fagradalsfjall eruption. Geochemical perspectives letters, 27, 54-58. https://doi.org/10.7185/geochemlet.2335

Journal Article Type Article
Acceptance Date Oct 1, 2023
Online Publication Date Oct 30, 2023
Publication Date 2023
Deposit Date Nov 1, 2023
Publicly Available Date Nov 1, 2023
Journal Geochemical Perspectives Letters
Print ISSN 2410-339X
Electronic ISSN 2410-3403
Publisher European Association of Geochemistry (EAG)
Peer Reviewed Peer Reviewed
Volume 27
Pages 54-58
DOI https://doi.org/10.7185/geochemlet.2335
Keywords Geochemistry and Petrology; Geology; Environmental Chemistry
Public URL https://durham-repository.worktribe.com/output/1873525

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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
Copyright: 2023 The Authors. This work is distributed under the Creative Commons Attribution 4.0 License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.





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