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Research ArticleArticle

Carbon cycle evolution before and after the Great Oxidation of the atmosphere

Don E. Canfield
American Journal of Science March 2021, 321 (3) 297-331; DOI: https://doi.org/10.2475/03.2021.01
Don E. Canfield
Department of Biology Nordcee and DIAS (Danish Institute for Advanced Studies), University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark
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  • For correspondence: dec@biology.sdu.dk
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Abstract

The rock record of organic carbon abundance and its isotopic composition is consistent with the evolution of life more than 3800 million years ago (Ma). Despite this, there are very few insights as to the ecology of this ancient biosphere or to its level of activity. One possible insight, however, comes from the isotopic composition of inorganic and organic carbon in ancient rocks. This isotope record can be used, in principle, to determine the proportion of inorganic carbon entering the oceans that was buried in sediments as organic matter, and thus it helps constrain the activity level of the ancient biosphere. A quantitative analysis of this isotope record, however, requires that we understand how the Earth-surface carbon reservoir has evolved over time, as burial rates of organic matter in marine sediments depend on the input rates of carbon to the oceans. We must also know how organic matter is weathered as a function of atmospheric oxygen concentrations, thus indicating how much of the organic matter in sediments is newly formed or recycled. To explore these issues, a carbon cycle model is developed here that includes an evolving Earth-surface carbon reservoir as well as the oxygen dependency of the organic matter weathering in rocks. The model also allows for the release of CO2 from organic matter during metamorphism and it contains a rock cycle with young and old reservoirs with appropriate transfer fluxes between them. The model shows that before the Great Oxidation Event (GOE) about 2400 Ma, only about 5 percent to 10 percent as much organic matter was buried into marine sediments as compared with today. Such low rates of organic matter burial would be consistent with a subdued marine biosphere. Such a subdued biosphere could possibly be consistent with primary production driven by anoxygenic photosynthesis coupled to an iron cycle. In association with, and in the aftermath of, the GOE, the biosphere likely increased its activity level by an order of magnitude. This large increase would have completely transformed the biology of the Earth and could have resulted from either the evolution and/or expansion of oxygen-producing cyanobacteria or a dramatic increase in the availability of nutrients to fuel oxygenic phototrophs.

  • carbon isotope
  • Archean
  • Proterozoic
  • GOE
  • Lomagundi
  • evolution
  • oxygen
  • cyanobacteria
  • carbon burial
  • carbon cycle
  • model
  • rock cycle
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American Journal of Science: 321 (3)
American Journal of Science
Vol. 321, Issue 3
1 Mar 2021
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Carbon cycle evolution before and after the Great Oxidation of the atmosphere
Don E. Canfield
American Journal of Science Mar 2021, 321 (3) 297-331; DOI: 10.2475/03.2021.01

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Carbon cycle evolution before and after the Great Oxidation of the atmosphere
Don E. Canfield
American Journal of Science Mar 2021, 321 (3) 297-331; DOI: 10.2475/03.2021.01
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  • Article
    • Abstract
    • INTRODUCTION
    • MODEL RESULTS AND DISCUSSION
    • THE GOE AND LOMAGUNDI ISOTOPE EVENT
    • CONCLUSIONS
    • ACKNOWLEDGMENTS
    • REFERENCES
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Keywords

  • carbon isotope
  • Archean
  • Proterozoic
  • GOE
  • Lomagundi
  • evolution
  • oxygen
  • cyanobacteria
  • Carbon burial
  • Carbon cycle
  • model
  • rock cycle

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