Abstract

Evidence for anoxic shallow oceans at 2.45 Ga: Implications for the rise of oxygenic photosynthesis

Highlights

  • After an anoxic beginning, Earth’s surface experienced a major rise in atmospheric oxygen, the Great Oxidation Event (GOE)

  • It is generally agreed that free oxygen in the oceans and atmosphere resulted from the evolution of oxygenic photosynthesis in Cyanobacteria (Fischer et al, 2016), the timing of this event has been difficult to constrain

  • The first favors the evolution of oxygenic Cyanobacteria hundreds of millions of years before the GOE, with oxygen consumed by redox buffers such as CH4 and Fe2+ in the oceans, preventing its accumulation in the atmos­ phere (Zahnle et al, 2006; Kump and Barley, 2007; Czaja et al, 2012; Satkoski et al, 2015)

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Summary

Introduction

Earth’s surface experienced a major rise in atmospheric oxygen, the Great Oxidation Event (GOE). Recent studies suggest that iron was deposited abiotically as nanometer-sized particles of greenalite [(Fe)3Si2O5(OH)4]) in anoxic seawater (Rasmussen et al, 2015a, 2015b, 2017; Johnson et al, 2018).

Results
Conclusion

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