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Arckaringa Basin

Entity ID: 40671 Compiled by: Kernich, A.L. Year: 2003 Status: Defined

Last Revised: 2013

Rank: province Type: sedimentary Subtype: intracratonic Location: SA On-shore

Synonyms: Includes the major Boorthanna and Phillipson Troughs and Coober Pedy and Mable Creek Ridges Symbol: NA

Minimum age: Early Permian, 284 ± 0 Ma Age method: inferred

Maximum age: Late Carboniferous, 300 ± 0 Ma Age method: inferred, biostratigraphic correlation

Summary: Late Carboniferous to Permian intracratonic basin covering around 80 000 square kilometres, with a central basement high and two major depositional troughs containing greater than 1000 m of sediment. There is very little outcrop of the glacial, marine to freshwater clastics and coal beds that make up the basin. Coal and coal seam gas are potential resources. One well encountered oil in Feb 2010. Diapiric piercement structure at Mount Toondina. Undeformed.

Attributes:
Area (square kilometres): 80 000
State: SA
Main rock types: siliciclastic sediments and sedimentary rocks
formations poorly defined due to lack of data
Main rock types: organic-rich sediments and sedimentary rocks
multi-seamed coal deposits with individual seams up to 10m in thickness
Main depositional environment: marine and non-marine
glacial deposits, marine transgression and freshwater deposits including coal beds and diaparism
Resources: Coal - undifferentiated
6 beds identified as sub-bituminous coal with total extent greater than 20Gt
Country: AUS

Parent: No data

Child Provinces: No data

Relationships:
Overlies - Cariewerloo Basin, Officer Basin
Underlies - Eromanga Basin

Constituent units: Boorthanna Formation (Basal bouldery claystone with shale, upper unit is bedded coarse and fine clastics.), Mount Toondina Formation (Siltstone, sandstone, coal, shale, rare carbonate), Stuart Range Formation (Shale, siltstone, sandstone)

Events: No data

Mineral Deposits: Murloocoppie, Westfield, Wintinna, East Wintinna, Phillipson, Weedina, Penryhn, Lochiel North

Key Reference: Drexel, J.F., Preiss, W.V. 1995, The geology of South Australia. Volume 2 - The Phanerozoic., Geological Survey of South Australia. Bulletin, 54, 347pp (Refid:44133)

Comments: Drillhole samples indicate that scattered subcrops of late Palaeozoic sediment extend well beyond the western margin of the basin.

Overview: The Late Carboniferous to Permian intracratonic Arckaringa Basin covers an area of 80 000 square km and is mostly restricted to the subsurface, only outcropping in patches in the southwest and southeast corners of the basin. The western, southern and south-eastern margins of the basin are defined by the outcropping of the Officer Basin, Gawler Craton, and Stuart Shelf respectively. However, drillhole samples indicate that scattered subcrops of late Palaeozoic sediment extend well beyond the western margin of the basin. The eastern margin is formed in part of the Peake and Denison Domain while the northern and north-eastern are not easily defined due to lack of outcrop and subsurface data. Structurally this intracratonic basin comprises of a central platform of shallow crystalline basement surrounded by depressions including two major northwest trending depositional troughs (the Boorthanna and Phillipson troughs) containing more than 1000m of Permian sediments. Sedimentation spread from the troughs across the basement highs. The predominately Permian sediments in the basin include (oldest to youngest) the Boorthanna, Stuart Range and Mount Toondina Formations as sub-horizontal successions uncomformably overlaying the Precambrian to Cambrian sediments and crystalline basement. Deposition of the Early Permian Boorthanna Formation commenced with widespread glaciation. Following deglaciation, marine transgression occurred indicated by the Stuart Range Formation with eustatic rise in sea level and flooding of glacio-isostatically depressed lowlands. The Mount Toondina Formation marks the termination of marine sedimentation, through either crustal isostatic recovery or eustatic fall, and a return to freshwater conditions and development of coal swamps. Diapirism has affected the Arckaringa Basin, and sediments at Mount Toondina are seen to form a piercement structure (Drexel ,J.F. and Preiss, W.V., 1995).

Images: No data

Other media: No data

Source Information:

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This report was generated on Wednesday, July 23, 2014 9:57:34 AM EST.