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Basement structure and its influence on the pattern and geometry of continental rifting and breakup along Australia's southern rift margin

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Created 13/01/2025

Updated 13/01/2025

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Palaeogeographic reconstructions of the Australian and Antarctic margins based on matching basement structures are commonly difficult to reconcile with those derived from ocean floor magnetic anomalies and plate vectors. Following identification of a previously unmapped crustal-scale structure in the southern part of the Delamerian Orogen (Coorong Shear Zone), a revised plate reconstruction for these margins is proposed. This reconstruction positions the Coorong Shear Zone opposite the Mertz Shear Zone and indicates that structural inheritance had a profound influence on the location and geometry of continental breakup, and ocean fracture development. Previously, the Mertz Shear Zone has been correlated with the Proterozoic Kalinjala Mylonite Zone in the Gawler craton but this means that Australia is positioned 300-400 km too far east relative to Antarctica prior to breakup. Differences in the orientation of late Jurassic-Cretaceous basin-bounding normal faults in the Bight and Otway basins further suggest that extensional strain during basin formation was partitioned across the Coorong Shear Zone following an earlier episode of strike-slip faulting on a northwest-striking continental transform fault (Trans-Antarctic Shear).

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Title Basement structure and its influence on the pattern and geometry of continental rifting and breakup along Australia's southern rift margin
Language eng
Licence notspecified
Landing Page https://devweb.dga.links.com.au/data/dataset/2a3e70fd-480c-4a17-a71c-ed1a7825894a
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage http://www.ga.gov.au/place-names/PlaceDetails.jsp?submit1=GA1
Data Portal data.gov.au

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This dataset was originally found on data.gov.au "Basement structure and its influence on the pattern and geometry of continental rifting and breakup along Australia's southern rift margin". Please visit the source to access the original metadata of the dataset:
https://devweb.dga.links.com.au/data/dataset/basement-structure-and-its-influence-on-the-pattern-and-geometry-of-continental-rifting-and-bre

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