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The upper crustal geology of the Georgina Basin region

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Created 20/01/2025

Updated 20/01/2025

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Pattern recognition in regional maps of Bouguer anomalies and total magnetic intensity contours suggests that the basement of the Georgina Basin can be divided into four regions, three of which contain subsurface extensions of the Tennant Creek Inlier, Arunta Inlier and Mount Isa Orogen-South Nicholson Basin (sensu Plumb. in press), and a fourth in the south, for which there is no known outcrop and whose composition differs from the others. The boundaries between these regions are in most cases not visible in outcrop. The basement to the Georgina Basin thus consists predominantly of metamorphic rocks and granites inferred to be similar to the outcrop areas which surround it. This is overlain by Adelaidean and Phanerozoic sediments, which locally are up to 8000 m thick. With the exception of the Toko Syncline, Dulcie Syncline, Lander Trough and Burke River Structure, where up to 3500 m of Palaeozoic sediments are preserved, only a thin veneer up to 500 m thick of Phanerozoic sediments occurs in the basin. However, considerable thicknesses of possible Adelaidean sediments are interpreted to occur both beneath these structures and locally elsewhere, for example 3000 m in the Toko Syncline, 4000 m near Camooweal (this figure may include older Carpentarian rocks), and 6000 m in the Glenormiston-Sandover River area. A geological history for the basement of the area is proposed, which provides a framework for subsequent deposition in the Georgina Basin. An important suggestion is that there was extensive thrusting to the northeast of the Arunta Inlier rocks at about 1000 m.y. - which produced scalloped thrusts, some of which may cut Mount Isa Orogen rocks. It is inferred that thick Adelaidean sediments were subsequently deposited in graben with active margins along these thrusts, and later, after a brief hiatus, a similar reactivation was accompanied by Palaeozoic sedimentation.

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Title The upper crustal geology of the Georgina Basin region
Language eng
Licence notspecified
Landing Page https://devweb.dga.links.com.au/data/dataset/27fd3aee-a5ae-4293-8458-99c021063b35
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage {"type": "Polygon", "coordinates": [[[133.5, -25.5], [141.0, -25.5], [141.0, -17.5], [133.5, -17.5], [133.5, -25.5]]]}
Data Portal data.gov.au

Data Source

This dataset was originally found on data.gov.au "The upper crustal geology of the Georgina Basin region". Please visit the source to access the original metadata of the dataset:
https://devweb.dga.links.com.au/data/dataset/the-upper-crustal-geology-of-the-georgina-basin-region