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Marine oxygen production and open water supported an active nitrogen cycle during the Marinoan Snowball Earth

Author

Listed:
  • Benjamin W. Johnson

    (University of Victoria
    University of Colorado, Department of Geological Sciences UCB 399)

  • Simon W. Poulton

    (The University of Leeds)

  • Colin Goldblatt

    (University of Victoria)

Abstract

The Neoproterozoic Earth was punctuated by two low-latitude Snowball Earth glaciations. Models permit oceans with either total ice cover or substantial areas of open water. Total ice cover would make an anoxic ocean likely, and would be a formidable barrier to biologic survival. However, there are no direct data constraining either the redox state of the ocean or marine biological productivity during the glacials. Here we present iron-speciation, redox-sensitive trace element, and nitrogen isotope data from a Neoproterozoic (Marinoan) glacial episode. Iron-speciation indicates deeper waters were anoxic and Fe-rich, while trace element concentrations indicate surface waters were in contact with an oxygenated atmosphere. Furthermore, synglacial sedimentary nitrogen is isotopically heavier than the modern atmosphere, requiring a biologic cycle with nitrogen fixation, nitrification and denitrification. Our results indicate significant regions of open marine water and active biologic productivity throughout one of the harshest glaciations in Earth history.

Suggested Citation

  • Benjamin W. Johnson & Simon W. Poulton & Colin Goldblatt, 2017. "Marine oxygen production and open water supported an active nitrogen cycle during the Marinoan Snowball Earth," Nature Communications, Nature, vol. 8(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-01453-z
    DOI: 10.1038/s41467-017-01453-z
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    Cited by:

    1. Huyue Song & Zhihui An & Qin Ye & Eva E. Stüeken & Jing Li & Jun Hu & Thomas J. Algeo & Li Tian & Daoliang Chu & Haijun Song & Shuhai Xiao & Jinnan Tong, 2023. "Mid-latitudinal habitable environment for marine eukaryotes during the waning stage of the Marinoan snowball glaciation," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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