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BIOGEOCHEMISTRY

An Archaean oxygen oasis

The first of two stepwise increases in atmospheric oxygen occurred at the end of the Archaean eon. Analyses of sulfur and iron isotopes in pyrite reveal a near-shore environment that hosted locally oxygenated conditions in the Mesoarchaean era.

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Fig. 1: A microbial mat in Little Ambergris Cay, Turks and Caicos, British Overseas Territories.

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Correspondence to Maya L. Gomes.

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Gomes, M.L. An Archaean oxygen oasis. Nature Geosci 11, 84–85 (2018). https://doi.org/10.1038/s41561-018-0058-z

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