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. 2021 Mar 16;12:1535. doi: 10.1038/s41467-021-21849-2

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© The Author(s) 2021

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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Fig. 3 — a Chemistry of the parent soil vs. fulgurite core and rim in this study. The equivalent composition line is the parent soil normalised to an anhydrous and organic-free composition. Error bars represent per cent uncertainty defined by measurements of standard STSD4 (see ‘Methods’ and Supplementary Table 1); where not shown, uncertainties are smaller than the used symbol. b Iron vs. phosphorus content of fulgurites from this and prior studies^{14–16,22,24,25,47,57,58} and three suites of Archean rocks: Abitibi greenstone belt Archean komatiites, Canada³⁹; Pilbara continental flood basalts, Australia⁴⁰; Isua supracrustal belt metavolcanics, Greenland⁴¹. The fulgurites are grouped by type¹⁶, presence of graphitic carbon, and degree of reduction.