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. 2022 Sep 14;609(7927):529–534. doi: 10.1038/s41586-022-04981-x

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© The Author(s) 2022

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Extended Data Fig. 2 — a, TiO₂ versus MgO for whole rock and glass/tephra samples of the Fagradalsfjall eruption. For comparison, whole rock samples from other intra-transform spreading centers on the Reykjanes Peninsula are also shown^14,17,18. b, A single olivine crystal from sample G20210321-4 showing MIs with both low and high K₂O/TiO₂ and La/Yb. c-d, K₂O/TiO₂ and La/Yb vs. MgO, for whole rock and tephra samples compared to plagioclase (Plg), olivine (Ol) and clinopyoxene (Cpx) melt inclusions. In c, white stars represent the depleted (DM) and enriched (EM) parental melt end-member of the Reykjanes Peninsula²¹. Error bars are included on all panels and include external 2σ error for all whole rock and glass data (where average EPMA 2σ error is reported in the lower left corner) but 1σ error the SIMS data plotted in panel d.

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