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

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 mater

SUBMITTER: Bindeman IN 

PROVIDER: S-EPMC9243117 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature