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Structural interpretations of the Wonga Belt in the Proterozoic Mount Isa Inlier of northwest Queensland-a review

Created 16/10/2025

Updated 16/10/2025

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Two contrasting interpretations have been put forward recently for the structural evolution of the Wonga Belt, a north-south-trending anticlinal zone of strongly deformed metamorphic rocks, more than 80 km long and up to 5 km wide, in the central part of the Mount Isa Inlier. One interpretation involves major mid-crustal subhorizontal ductile extension with upper plate to the north, and the other involves north-south strike-slip faulting accommodating ditferential lateral transport of thrust sheets to either side, both the extension and strike-slip faulting taking place before the main folding event. A third interpretati on-relatively minor low-angle brittle extensional faulting and subsequent north-south strike-slip faulting predating folding-has been proposed for the southern continuation of the Wonga Belt. Stratigraphic continuity along the Wonga Belt and abrupt changes in stratigraphy across the belt are difficult to reconcile with the south-over-north mid-crustal extension hypothesis, but can be accounted for by the strike-slip faulting component of the other two interpretations. The postulated strike-slip displacement would have exceeded 80 km, and taken place between about 1780 Ma, the maximum age of the youngest metasediments affected, and 1115 Ma, the age of a dolerite dyke that post-dates cross-cutting faults.

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Title Structural interpretations of the Wonga Belt in the Proterozoic Mount Isa Inlier of northwest Queensland-a review
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/196ea0c9-431d-4d90-b5e7-caa39d47ca12
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
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  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Structural interpretations of the Wonga Belt in the Proterozoic Mount Isa Inlier of northwest Queensland-a review". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/structural-interpretations-of-the-wonga-belt-in-the-proterozoic-mount-isa-inlier-of-northwest-q