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Limited oxygen production in the Mesoarchean ocean

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DOI

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  • Embargoed (until 20/09/19)

Author(s)

Frantz Ossa Ossa, Axel Hofmann, Jorge E. Spangenberg, Simon W. Poulton, Eva E. Stüeken, Ronny Schoenberg, Benjamin Eickmann, Martin Wille, Mike Butler, Andrey Bekker

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Abstract

The Archean Eon was a time of predominantly anoxic Earth surface conditions, where anaerobic processes controlled bioessential element cycles. In contrast to “oxygen oases” well documented for the Neoarchean [2.8 to 2.5 billion years ago (Ga)], the magnitude, spatial extent, and underlying causes of possible Mesoarchean (3.2 to 2.8 Ga) surface-ocean oxygenation remain controversial. Here, we report δ15N and δ13C values coupled with local seawater redox data for Mesoarchean shales of the Mozaan Group (Pongola Supergroup, South Africa) that were deposited during an episode of enhanced Mn (oxyhydr)oxide precipitation between ∼2.95 and 2.85 Ga. Iron and Mn redox systematics are consistent with an oxygen oasis in the Mesoarchean anoxic ocean, but δ15N data indicate a Mo-based diazotrophic biosphere with no compelling evidence for a significant aerobic nitrogen cycle. We propose that in contrast to the Neoarchean, dissolved O2 levels were either too low or too limited in extent to develop a large and stable nitrate reservoir in the Mesoarchean ocean. Since biological N2 fixation was evidently active in this environment, the growth and proliferation of O2-producing organisms were likely suppressed by nutrients other than nitrogen (e.g., phosphorus), which would have limited the expansion of oxygenated conditions during the Mesoarchean.
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Details

Original languageEnglish
Pages (from-to)6647-6652
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume116
Issue number14
Early online date20 Mar 2019
DOIs
Publication statusPublished - 2 Apr 2019

    Research areas

  • Oxygen oasis, Nitrogen isotopes, Nutrient limitations, Oxygenic, Photosynthesis, Mesoarchean

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