The redox chemistry of anoxic continental margin settings evolved from widespread sulfide-containing (euxinic) conditions to a global ferruginous (iron-containing) state in the early Neoproterozoic era (from ~1 to 0.8 billion years ago). Ocean redox chemistry exerts a strong control on the biogeochemical cycling of phosphorus, a limiting nutrient, and hence on primary production, but the response of the phosphorus cycle to this major ocean redox transition has not been investigated. Here, we use a geochemical speciation technique to investigate the phase partitioning of phosphorus in an open marine, early Neoproterozoic succession from the Huainan Basin, North China. We find that effective removal of bioavailable phosphorus in association with iron minerals in a globally ferruginous ocean resulted in oligotrophic (nutrient limited) conditions, and hence a probable global decrease in primary production, organic carbon burial and, subsequently, oxygen production. Nevertheless, phosphorus availability and organic carbon burial were sufficient to maintain an oxidizing atmosphere. These data imply substantial nutrient-driven variability in atmospheric oxygen levels through the Proterozoic, rather than the stable levels commonly invoked.
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All data generated and analysed for the current study are attached, and are available from data repository https://doi.org/10.5285/72c9a48f-4813-4507-9137-a97d7e6bd2d9.
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This work was supported by NERC (NE/I005978/1) and NSFC (41661134048) through the Co-evolution of Life and the Planet programme, through the Biosphere Evolution, Transitions and Resilience (NE/P013651) programme, and the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (XDB18000000). S.W.P. and T.M.L. were supported by Royal Society Wolfson Research Merit Awards and S.W.P. by a Leverhulme Trust Fellowship.
The authors declare no competing interests.
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Guilbaud, R., Poulton, S.W., Thompson, J. et al. Phosphorus-limited conditions in the early Neoproterozoic ocean maintained low levels of atmospheric oxygen. Nat. Geosci. (2020). https://doi.org/10.1038/s41561-020-0548-7