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Stratigraphy of the Kanmantoo Group: a critical element of the Adelaide Fold Belt and the Palaeo-Pacific plate margin, Eastern Gondwana
journal contributionposted on 2023-05-16, 14:37 authored by Jago, JB, Gum, JC, Burtt, AC, Haines, P
The Kanmantoo Group, occupying a key position along the Cambrian Palaeo-Pacific margin of southern Australia Gondwana, comprises two distinct successions (from bottom to top): (1) the Keynes Subgroup comprising the Carrickalinga Head and Backstairs Passage Formations (lowstand systems tract, transgressive systems tract, highstand systems tract); and (ii) the unconformably overlying Bollaparudda Subgroup (new name) comprising the Talisker, Tapanappa, Tunkalilla, Balquhidder, Petrel Cove and Middleton Formations. Both conventional stratigraphy and recent isotopic work point to the base of the Kanmantoo Group as representing a major change in the depositional history of the Adelaide Geosyncline. The type section of the Kanmantoo Group, along the south coast of the Fleurieu Peninsula, is now recognised as being characterised by structural complexity (shear zones, folding), contrary to the essentially largely non-faulted homoclinal structure described by most earlier authors. Many of the formation boundaries in the type section, previously described as conformable, are in fact faulted. As a result, subsidiary type sections are proposed for the Talisker and Tunkalilla Formations.
Publication titleAustralian Journal of Earth Sciences
Department/SchoolSchool of Natural Sciences
PublisherBlackwells Science Asia
Place of publicationCarlton, Victoria, Australia