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. 2021 Feb 17;12:1101. doi: 10.1038/s41467-021-21323-z

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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. 6 — Reproducibility of the stable isotope measurements is 0.3 ‰. A total of 11 black barite samples and 11 grey barite samples was analysed. The relatively low δ¹³C values in the black barites possibly reflect the addition of a biomass-derived carbon component to the fluids.