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The hidden Proterozoic successions of the Barkly region
The Barkly Seismic Survey data images a complete seismic profile from the newly discovered Carrara Sub-basin of the South Nicholson region (e.g. Carr et al 2019) to the eastern margins of the Beetaloo Sub-basin. The survey, comprising five lines and a total of 813 line kms, links into the recently acquired EFTF South Nicholson Seismic Survey (L210; Henson et al 2018, Carr et al 2019, 2020) and the Camooweal 2D seismic survey completed by the Geological Survey of Queensland in 2019. The survey has identified Paleoproterozoic to Mesoproterozoic successions extending from the Carrara Sub-basin to the highly prospective Beetaloo Sub-basin of the McArthur Basin. These successions are concealed by a persistent cover of up to 600 m of Paleozoic Georgina Basin sediments. The recent completion of the MinEx CRC deep (1751 m) stratigraphic drillhole, NDI Carrara-1, located on the western margin of the Carrara Sub-basin have greatly improved the geological constraints on our preliminary stratigraphic interpretations.
Our geological interpretation (Southby et al., 2021) of the Barkly Seismic Survey established three informal geological domains, each defined by dominant structural elements and/or basin characteristics. These informal domains are, from southeast to northwest.
• Carrara domain: includes the south-western margins of the Carrara Sub-basin and a shoulder of shallow metamorphic basement, where overlying Proterozoic sediments of the Carrara Sub-basin are absent. The Carrara Sub-basin is as much as 10 000 m deep (Carr et al. 2019, 2020), and interpreted to comprise four superbasin sequences from oldest to youngest, the Paleoproterozoic Leichhardt (ca. 1790–1750 Ma), Calvert (ca. 1735–1690 Ma) and Isa (ca. 1670–1575 Ma) Superbasins and the Mesoproterozoic Roper Superbasin
• Brunette Downs rift corridor (BDrc) is characterised by south-easterly deepening half-grabens, controlled by steeply dipping extensional bounding faults and minor sub-parallel subsidiary faults. The rift corridor has been divided into two rift packages containing the same sedimentary sequences as in the Carrara domain. The Leichhardt Superbasin successions show stratal thickening away from the bounding fault, to the northwest, whereas the Calvert Superbasin and, in particular, the Isa Superbasin, show marked southeast-directed stratal thickening into the bounding fault. However, most importantly these features share remarkably similar orientation, geometry and structural evolution to similar half grabens identified along strike in the South Nicholson and Lawn Hill Platform regions to the north-east, representing a continuous rift corridor extending over 400 km.
• Beetaloo-McArthur domain: The seismic data reveals continuation of mostly flat lying Proterozoic sedimentary successions of the Beetaloo Sub-basin (the Redbank, Glyde and Nathan packages) over some 250 km southeast towards the BDrc. The southern boundary of this domain is a fault-bounded horst of Proterozoic basement rocks interpreted to be a concealed south-west extension of Murphy Province basement and which separates the Beetaloo-McArthur domain from the BDrc.
The seismic data from the Barkly Seismic Survey, in conjunction the South Nicholson survey and the ongoing work on the Carrara 1 well, has identified similarities in sedimentary successions and architecture between the Carrara Sub-basin basin and the Beetaloo Sun-basin. It has also revealed extensive Paleoproterozoic successions between the Carrara and Beetaloo sub-basins. This work will greatly improve regional resource evaluations, and stimulate greenfield exploration across this part of northern Australia.
Abstract/Poster presented at the 2022 Central Australian Basins Symposium IV ( https://agentur.eventsair.com/cabsiv/)
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Identification info
- Date (Creation)
- 2021-11-09T11:12:00
- Date (Publication)
- 2023-11-09T22:15:22
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/146074
Identifier
- Codespace
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Digital Object Identifier
- Cited responsible party
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Role Organisation / Individual Name Details Author Southby, C.
MEG Internal Contact Author Rollet, N.
MEG Internal Contact Author Carson, C.
MEG Internal Contact Author Carr, L.
MEG Internal Contact Author Henson, P.
MEG Internal Contact Author Butcher, G.
MEG Internal Contact Author Fomin, T.
MEG Internal Contact Author Costelloe, R.
MEG Internal Contact Author Doublier, M.
MEG Internal Contact Author Close, D.
External Contact
- Name
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Central Australian Basins Symposium IV 29-30 August 2022 Darwin, NT
- Purpose
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Conference Poster Abstract for Central Australian Basins Symposium IV 2022
- Status
- Completed
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Resource provider Minerals, Energy and Groundwater Division
External Contact Point of contact Southby, C.
MEG Internal Contact
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- Geoscientific information
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Extent
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- As needed
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Product data repository: Various Formats
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- theme.ANZRC Fields of Research.rdf
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EARTH SCIENCES
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- Place
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Beetaloo Sub-basin
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Carrara Sub-basin
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- Discipline
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Seismic interpretation
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Published_External
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Creative Commons Attribution 4.0 International Licence
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CC-BY
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4.0
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© Petroleum Exploration Society of Australia Limited 2023
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Australian Government Security ClassificationSystem
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- 2018-11-01T00:00:00
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- Unclassified
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- English
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Role Organisation / Individual Name Details Distributor Commonwealth of Australia (Geoscience Australia)
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Link to Conference Proceedings - Volume 1 (P72)
Link to Conference Proceedings - Volume 1 (P72)
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Link to Abstract
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- Statement
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Conference Poster Abstract for Central Australian Basins Symposium IV 2022
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- Title
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Australian Government Security Classification System
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
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urn:uuid/6511fd96-359d-43a4-b127-52f1d9ff9bc3
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Owner Southby, C
Internal Contact Point of contact Southby, C.
MEG Internal Contact
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- Document
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Conference Posters and Presentations
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Geoscience Australia - short identifier for metadata record with
uuid
- Citation identifier
- eCatId/146074
- Date info (Creation)
- 2019-04-08T01:55:29
- Date info (Revision)
- 2019-04-08T01:55:29
Metadata standard
- Title
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AU/NZS ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-3
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Geoscience Australia Community Metadata Profile of ISO 19115-1:2014
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Version 2.0, September 2018
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- https://pid.geoscience.gov.au/dataset/ga/122551