Ancient metamorphosed basalts show a sulfur isotopic fingerprint of surface sediment, suggesting volatile cycling by a subduction-like process was occurring more than 3.8 billion years ago.
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Hoffmann, J.E. Early start to volatile cycling. Nat. Geosci. 18, 374–375 (2025). https://doi.org/10.1038/s41561-025-01689-1
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DOI: https://doi.org/10.1038/s41561-025-01689-1
