Journal article

Neoproterozoic marine dolomite hardgrounds and their relationship to cap dolomites

Malcolm W Wallace, Ashleigh VS Hood, Joe Fayle, Emily S Hordern, Tessa F O'Hare

PRECAMBRIAN RESEARCH | ELSEVIER SCIENCE BV | Published : 2019

Abstract

Neoproterozoic cap dolomites are unusual and distinctive marker units that occur after large Cryogenian glaciations. Several thin dolomite units that have features resembling cap dolomites occur within the Cryogenian-Ediacaran succession of the Adelaide Geosyncline. While each of these dolomite units has distinctive features, they also share many similarities with cap dolomites including: stratigraphic thickness ranging from several centimetres to several metres; impure dolomicrite composition; graded beds with a sharp top that become more dolomite-rich upwards; and evidence of volume expansion in the form of sheet cracks, tepees or other soft- sediment deformation structures. The carbon iso..

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Grants

Awarded by Australian Research Council Discovery Grant


Funding Acknowledgements

We are most grateful to Marg and Doug Sprigg of Arkaroola Wilderness Sanctuary for their generous support of fieldwork over many years. This research is partially funded from Australian Research Council Discovery Grant DP130102240, together with funds from a Puzey Fellowship and Baragwanath Scholarship awarded to Ashleigh Hood. We thank Galen Halverson and Erik Hiatt who gave constructive reviews that improved the manuscript.