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Bight Basin

Entity ID: 22356 Compiled by: Totterdell, J. and Rollet, N. Year: 2002 Status: Defined

Last Revised: 2013

Rank: province Type: sedimentary Subtype: polyhistory Location: SA, WA On-shore and off-shore

Synonyms: NA Symbol: NA

Minimum age: Forcipites longus Age method: biozone

Maximum age: Callovian Age method: biozone

Summary: The Jurassic-Cretaceous Bight Basin is a large, mainly offshore frontier basin on the southern Australian passive margin containing more than 12 km of siliciclastic non-marine, marine and deltaic rocks.

Attributes:
Area (square kilometres): 804000
State: WA
State: SA
Minimum present water depth (m): 0
Maximum present water depth (m): 5500
Main rock types: siliciclastic sediments and sedimentary rocks
Main depositional environment: marine and non-marine
Minimum sediment thickness (m): 0
Maximum sediment thickness (m): 15000
Present crustal setting: continental
Present crustal setting: transitional
Country: AUS

Parent: No data

Child Provinces: Eyre Sub-basin, Duntroon Sub-basin, Ceduna Sub-basin, Madura Shelf, Recherche Sub-basin, Denmark Sub-basin, Couedic Shelf, Bremer Sub-basin

Relationships:
Adjoins - Otway Basin, Yallingup Shelf
Overlies - Officer Basin, Polda Basin
Underlies - Eucla Basin

Constituent units: Loongana Formation, Madura Formation, Pidinga Formation, Platypus Formation, Polda Formation, Neptune Formation, Wigunda Formation, Potoroo Formation, Hammerhead Supersequence, Tiger Supersequence, White Pointer Supersequence, Blue Whale Supersequence, Bronze Whaler Supersequence, Southern Right Supersequence, Minke Supersequence, Sea Lion Supersequence, Bremer 1, Bremer 2, Bremer 3, Bremer 4, Bremer 5, Bremer 6

Events: Australia-Antarctica break-up, Southern Margin Late Cretaceous and Cenozoic magmatism, Eyre extension, Ceduna extension, Mulgara gravity-driven deformation, Kowari gravity slide

Mineral Deposits: No data

Key Reference: Bradshaw, B.E., Rollet, N., Totterdell, J.M., Borissova, I. 2003, A revised structural framework for frontier basins on the southern and southwestern Australian continental margin., Geoscience Australia. Record, 2003/03, 44 (Refid:13490)

Comments: Published definition available in Bradshaw et al. (2003) and Totterdell et al. (2003).

Overview: The Jurassic to Cretaceous Bight Basin is a large, mainly offshore basin on the southern Australian passive margin. The basin developed during two successive periods of extension and thermal subsidence that commenced in the Middle to Late Jurassic. The middle Cretaceous extensional phase resulted in the Late Santonian break-up of Australia and Antarctica. The basin contains six depocentres, the Ceduna, Duntroon, Eyre, Recherche, Bremer and Denmark sub-basins. The thickest of these, the Ceduna Sub-basin, underlies a broad bathymetric terrace in water depths ranging from 200 to over 4000 m, and contains a sedimentary section in excess of 12 km thick. Jurassic and Early Cretaceous deposition was dominantly non-marine, but from the late Aptian until the end of the Cretaceous deposition took place in mainly marine to deltaic environments. This Late Cretaceous succession contains thick marine intervals that include potential marine source rocks. The basin (Ceduna Sub-basin in particular) is characterised by two periods of deltaic progradation. The Albian to Cenomanian delta is characterised by a mobile substrate, extensive growth faulting and mud diapirism, whereas the Late Santonian to Maastrichtian delta is a sand-rich system featuring strongly progradational stratal geometries. Potential structural and stratigraphic traps are present within both deltaic systems, with the later delta especially containing good potential reservoirs. Potential plays in the Eyre Sub-basin are associated with tilted fault blocks within a fluvio-lacustrine half-graben system. Indications of active petroleum systems in the basin include oil and gas shows (Greenly 1), a palaeo-oil column (Jerboa 1), and evidence of seepage (slicks, ALF anomalies, stranded asphaltites).

Images: Eastern Bight Basin structural elements and cross-section location map (82 KB), Western Bight Basin structural elements and cross-section location map (67 KB), Eastern Bight Basin regional cross-section Profile 1 (59 KB), Eastern Bight Basin regional cross-section Profile 2 (68 KB), Eastern Bight Basin regional cross-section Profile 3 (80 KB), Eastern Bight Basin regional cross-section Profile 4 (76 KB), Eastern Bight Basin regional cross-section Profile 6 (41 KB), Eastern Bight Basin regional cross-section Profile 5 (50 KB), Eastern Bight Basin regional cross-section Profile 7 (57 KB), Western Bight Basin regional cross-section Profile 8 (35 KB), Bight Basin sequence stratigraphy and basin phases (61 KB), Bight Basin petroleum systems chart (70 KB), Eastern Bight Basin seepage location map (60 KB)

Other media: No data

Source Information:

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This report was generated on Monday, November 24, 2014 2:06:58 PM EST.