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Crustal structure of the Olympic Dam region: Constraints from deep seismic reflection profiles

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Created 14/01/2025

Updated 14/01/2025

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Two nearly orthogonal deep seismic reflection profiles acquired in the northern Stuart Shelf, and centred on the Olympic Dam Fe oxide Cu-U-Au deposit, clearly image the cover successions and the structure of the cratonic basement around the deposit. Along the line of the profiles, sequences of the Pandurra Formation, Adelaide Rift Complex, and the Stuart Shelf have total thicknesses varying from ~300 m to over 6 km. Known upper crustal units of the basement, e.g., Burgoyne batholith, Gawler Range Volcanics, Wallaroo Group, and Donington Granitoid Suite, were also clearly imaged. The mid-crust is dominated by a sub-horizontal, internally packaged, partly mafic layer up to ~5 km thick. The lower crust contains a north-dipping transcrustal shear zone, which does not appear to separate crust identifiable as discrete terranes. However, the lower crust farther to the northeast may be a distinct terrane, as it is relatively homogenous and characterised by sub-horizontal, rather than dipping, reflectivity. The seismic Moho occurs at about 40-42 km depth. The upper crust contains dipping seismic events interpreted as thrust complexes, which may have provided first-order fluid pathways for the minerals system. Excepting orthogneisses of the older Donington Granitoid Suite, the only plutonic body imaged is the Burgoyne batholith of the Hiltaba Suite.

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Title Crustal structure of the Olympic Dam region: Constraints from deep seismic reflection profiles
Language eng
Licence Not Specified
Landing Page https://devweb.dga.links.com.au/data/dataset/7257f434-7f56-4b35-9852-8d90e2625210
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 22/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
Data Portal Data.gov.au