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.

doi:10.7185/geochemlet.2335

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.

Authors

Madeleine Stow madeleine.a.stow@durham.ac.uk
Academic Visitor

Professor Julie Prytulak julie.prytulak@durham.ac.uk
Professor

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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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.