Journal article

Enigmatic carbonates of the Ombombo Subgroup, Otavi Fold Belt, Namibia: A prelude to extreme Cryogenian anoxia?

AVS Hood, MW Wallace, CP Reed, K-H Hoffmann, EE Freyer



The Ombombo Subgroup of the Otavi Fold Belt, Kaokoveld, Namibia preserves a succession of clastic and carbonate sediments with unusual sedimentary features. The stratigraphy of these units is discussed here in detail for the first time since their initial definition, with particular emphasis on the sedimentology of carbonate units. Early Neoproterozoic shales of the Beesvlakte Formation, equivalent to the Zambian Katangan Copperbelt's Lower Roan Formation, host evaporitic lithologies and minor copper mineralisation. The overlying, dolomitic ~ 760. Ma Devede Formation contains carbonate platformal lithologies which are in many ways dissimilar to Phanerozoic shallow-water carbonates. This incl..

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Awarded by Australian Research Council Discovery Project

Funding Acknowledgements

The authors would like to thank Teck Namibia Ltd., as well as the Namibian Geological Survey for their ongoing support during fieldwork. The authors acknowledge the Australian Research Council Discovery Project DP130102240 for financial assistance with this research. We are grateful to B. Jones, P. Pufahl, and an anonymous reviewer for their careful reviews and comments, which have improved the manuscript.