Sulphur cycling on early Earth is commonly linked to microbial activity. However, sulphur isotope values from 3.2–3.5-billion-year-old rocks indicate a central role for the breakdown of volcanic sulphur dioxide by ultraviolet radiation instead.
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Wing, B. Unexpectedly abiotic. Nature Geosci 5, 598–599 (2012). https://doi.org/10.1038/ngeo1561
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DOI: https://doi.org/10.1038/ngeo1561
