Triple oxygen isotope evidence for limited mid-Proterozoic primary productivity

Peter W. Crockford (), Justin A. Hayles, Huiming Bao, Noah J. Planavsky, Andrey Bekker, Philip W. Fralick, Galen P. Halverson, Thi Hao Bui, Yongbo Peng and Boswell A. Wing
Additional contact information
Peter W. Crockford: McGill University, Montreal
Justin A. Hayles: Rice University
Huiming Bao: Louisiana State University
Noah J. Planavsky: Yale University
Andrey Bekker: University of California Riverside
Philip W. Fralick: Lakehead University, Thunder Bay
Galen P. Halverson: McGill University, Montreal
Thi Hao Bui: McGill University, Montreal
Yongbo Peng: Louisiana State University
Boswell A. Wing: University of Colorado Boulder

Nature, 2018, vol. 559, issue 7715, 613-616

Abstract: Abstract The global biosphere is commonly assumed to have been less productive before the rise of complex eukaryotic ecosystems than it is today1. However, direct evidence for this assertion is lacking. Here we present triple oxygen isotope measurements (∆17O) from sedimentary sulfates from the Sibley basin (Ontario, Canada) dated to about 1.4 billion years ago, which provide evidence for a less productive biosphere in the middle of the Proterozoic eon. We report what are, to our knowledge, the most-negative ∆17O values (down to −0.88‰) observed in sulfates, except for those from the terminal Cryogenian period2. This observation demonstrates that the mid-Proterozoic atmosphere was distinct from what persisted over approximately the past 0.5 billion years, directly reflecting a unique interplay among the atmospheric partial pressures of CO2 and O2 and the photosynthetic O2 flux at this time3. Oxygenic gross primary productivity is stoichiometrically related to the photosynthetic O2 flux to the atmosphere. Under current estimates of mid-Proterozoic atmospheric partial pressure of CO2 (2–30 times that of pre-anthropogenic levels), our modelling indicates that gross primary productivity was between about 6% and 41% of pre-anthropogenic levels if atmospheric O2 was between 0.1–1% or 1–10% of pre-anthropogenic levels, respectively. When compared to estimates of Archaean4–6 and Phanerozoic primary production7, these model solutions show that an increasingly more productive biosphere accompanied the broad secular pattern of increasing atmospheric O2 over geologic time8.

Date: 2018
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DOI: 10.1038/s41586-018-0349-y

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