Uncovering the Ediacaran phosphorus cycle

Matthew S. Dodd, Wei Shi, Chao Li (), Zihu Zhang, Meng Cheng, Haodong Gu, Dalton S. Hardisty, Sean J. Loyd, Malcolm W. Wallace, Ashleigh vS. Hood, Kelsey Lamothe, Benjamin J. W. Mills, Simon W. Poulton and Timothy W. Lyons
Additional contact information
Matthew S. Dodd: Chengdu University of Technology
Wei Shi: Chengdu University of Technology
Chao Li: Chengdu University of Technology
Zihu Zhang: Chengdu University of Technology
Meng Cheng: Chengdu University of Technology
Haodong Gu: China University of Geosciences
Dalton S. Hardisty: Michigan State University
Sean J. Loyd: California State University
Malcolm W. Wallace: University of Melbourne
Ashleigh vS. Hood: University of Melbourne
Kelsey Lamothe: University of Melbourne
Benjamin J. W. Mills: University of Leeds
Simon W. Poulton: University of Leeds
Timothy W. Lyons: University of California, Riverside

Nature, 2023, vol. 618, issue 7967, 974-980

Abstract: Abstract Phosphorus is a limiting nutrient that is thought to control oceanic oxygen levels to a large extent1–3. A possible increase in marine phosphorus concentrations during the Ediacaran Period (about 635–539 million years ago) has been proposed as a driver for increasing oxygen levels4–6. However, little is known about the nature and evolution of phosphorus cycling during this time4. Here we use carbonate-associated phosphate (CAP) from six globally distributed sections to reconstruct oceanic phosphorus concentrations during a large negative carbon-isotope excursion—the Shuram excursion (SE)—which co-occurred with global oceanic oxygenation7–9. Our data suggest pulsed increases in oceanic phosphorus concentrations during the falling and rising limbs of the SE. Using a quantitative biogeochemical model, we propose that this observation could be explained by carbon dioxide and phosphorus release from marine organic-matter oxidation primarily by sulfate, with further phosphorus release from carbon-dioxide-driven weathering on land. Collectively, this may have resulted in elevated organic-pyrite burial and ocean oxygenation. Our CAP data also seem to suggest equivalent oceanic phosphorus concentrations under maximum and minimum extents of ocean anoxia across the SE. This observation may reflect decoupled phosphorus and ocean anoxia cycles, as opposed to their coupled nature in the modern ocean. Our findings point to external stimuli such as sulfate weathering rather than internal oceanic phosphorus–oxygen cycling alone as a possible control on oceanic oxygenation in the Ediacaran. In turn, this may help explain the prolonged rise of atmospheric oxygen levels.

Date: 2023
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DOI: 10.1038/s41586-023-06077-6

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