Journal article

Extreme ocean anoxia during the Late Cryogenian recorded in reefal carbonates of Southern Australia

Ashleigh van Smeerdijk Hood, Malcolm William Wallace



The Neoproterozoic was a time of great change in the Earth's surface and marine environments, including extensive climate variability, the widespread oxygenation of the oceans and the accompanying rise of animal life. However, the timing of ocean oxygenation remains uncertain, particularly in regard to Cryogenian seas, which were disrupted by large periods of global glaciation. Interglacial Cryogenian reef complexes in the Northern Adelaide Fold Belt of Australia contain abundant primary marine dolomite cements. These cements have well-preserved textural and growth zonation, indicating they preserve their original marine chemistry and can be used as geochemical proxies for Late Cryogenian pa..

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Awarded by ARC Discovery Grant

Funding Acknowledgements

The authors would like to thank Doug and Marg Sprigg for their assistance during fieldwork. Thanks also go to Bence Paul and Alan Greig for their assistance with LA-ICP-MS analysis. We also acknowledge the ARC Discovery Grant (DP130102240) for funding this research. Reviews by the editor, C. Fedo; T. Algeo and an anonymous reviewer helped improve the manuscript and are gratefully acknowledged.