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The Toomba Fault and the western margin of the Toko Syncline, Georgina Basin, Queensland and Northern Territory

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Created 20/01/2025

Updated 20/01/2025

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The Toomba Fault is a major basement fault which extends for 200 km and forms part of the southwest margin of the Lower Palaeozoic Georgina Basin. Structural data from five detailed seismic and gravity profiles over the Toomba Fault establish that it is a high-angle reverse fault, with a dip varying between 40° and 70° and vertical displacement up to 6.5 km. The Palaeozoic strata to the northeast of the fault are steeply upturned, overturned, or folded into anticlines or monoclines. Associated faulting varies from small-throw faults to fracture zones 4 km wide, and reverse faulting. These data are consistent with other geological evidence that the area of the Toko Syncline was under general northerly compression during Late Devonian or Early Carboniferous time, and that right-lateral wrenching occurred along the fault, with up to 4 km of horizontal displacement. The presence of compressional features in adjoining Palaeozoic sediments indicates oblique convergence of crustal blocks during the wrenching. The area immediately east of the fault has several types of potential hydrocarbon traps. Up to 10 km of Adelaidean strata underlie Palaeozoic sediments within the Toko Syncline and up to 3.5 km of these sediments are present west of the syncline. A near-surface low-velocity layer, up to 250 m thick, west of the Toomba Fault, and concealed by sand and alluvium, probably comprises Jurassic to Cretaceous strata.

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Title The Toomba Fault and the western margin of the Toko Syncline, Georgina Basin, Queensland and Northern Territory
Language eng
Licence notspecified
Landing Page https://devweb.dga.links.com.au/data/dataset/727d485d-4abc-4d13-803d-3e9feea8ca73
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage {"type": "Polygon", "coordinates": [[[134.0, -26.0], [142.0, -26.0], [142.0, -18.0], [134.0, -18.0], [134.0, -26.0]]]}
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