Diverse mantle components with invariant oxygen isotopes in the 2021 Fagradalsfjall eruption, Iceland

I. N. Bindeman*, F. M. Deegan, V. R. Troll, T. Thordarson, Höskuldsson, W. M. Moreland, E. U. Zorn, A. V. Shevchenko, T. R. Walter

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The basalts of the 2021 Fagradalsfjall eruption were the first erupted on the Reykjanes Peninsula in 781 years and offer a unique opportunity to determine the composition of the mantle underlying Iceland, in particular its oxygen isotope composition (δ18O values). The basalts show compositional variations in Zr/Y, Nb/Zr and Nb/Y values that span roughly half of the previously described range for Icelandic basaltic magmas and signal involvement of Icelandic plume (OIB) and Enriched Mid-Ocean Ridge Basalt (EMORB) in magma genesis. Here we show that Fagradalsfjall δ18O values are invariable (mean δ18O = 5.4 ± 0.3‰ 2 SD, N = 47) and indistinguishable from “normal” upper mantle, in contrast to significantly lower δ18O values reported for erupted materials elsewhere in Iceland (e.g., the 2014–2015 eruption at Holuhraun, Central Iceland). Thus, despite differing trace element characteristics, the melts that supplied the Fagradalsfjall eruption show no evidence for 18O-depleted mantle or interaction with low-δ18O crust and may therefore represent a useful mantle reference value in this part of the Icelandic plume system.

Original languageEnglish
Article number3737
Pages (from-to)3737
JournalNature Communications
Volume13
Issue number1
DOIs
Publication statusPublished - 29 Jun 2022

Bibliographical note

Funding Information:
We are grateful to Jens Henriksson and Nour Sharaf Aldeen for help with preparing rock samples at Uppsala University, Simon Bufferal for collecting two of the samples, and Jóna Sigurlína Pálmadóttir at the University of Iceland for drafting the map in Fig. . We also appreciate satellite imagery acquisitions by Pleiades through the plan ICR_FC_337038-CEOS-REYKJANES (Iceland-CEOS program). I.N.B. acknowledges support from the National Science Foundation (NSF; grant number EAR 1822977); F.M.D. and V.R.T. acknowledge support from the Swedish Research Council (Vetenskapsrådet; grant numbers 2016-04838 and 2018-04933) and the Natural Resources and Sustainable Development Program (NRHU) at Uppsala University; and T.T. acknowledges support from the Icelandic Government.

Funding Information:
We are grateful to Jens Henriksson and Nour Sharaf Aldeen for help with preparing rock samples at Uppsala University, Simon Bufferal for collecting two of the samples, and Jóna Sigurlína Pálmadóttir at the University of Iceland for drafting the map in Fig. 1a. We also appreciate satellite imagery acquisitions by Pleiades through the plan ICR_FC_337038-CEOS-REYKJANES (Iceland-CEOS program). I.N.B. acknowledges support from the National Science Foundation (NSF; grant number EAR 1822977); F.M.D. and V.R.T. acknowledge support from the Swedish Research Council (Vetenskapsrådet; grant numbers 2016-04838 and 2018-04933) and the Natural Resources and Sustainable Development Program (NRHU) at Uppsala University; and T.T. acknowledges support from the Icelandic Government.

Publisher Copyright:
© 2022, The Author(s).

Fingerprint

Dive into the research topics of 'Diverse mantle components with invariant oxygen isotopes in the 2021 Fagradalsfjall eruption, Iceland'. Together they form a unique fingerprint.

Cite this