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Madura Shelf

Entity ID: 27361 Compiled by: Bradshaw, B.E. and Pepper, M.R. Year: 2003 Status: Defined

Last Revised: 2013

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

Synonyms: NA Symbol: NA

Minimum age: Campanian Age method: inferred, biostratigraphic correlation

Maximum age: Balmeiopsis limbata Zone Age method: biozone

Summary: The Early to Late Cretaceous Madura Shelf is a newly defined component of the Bight Basin that contains up to 2200 m of predominantly siliciclastic marine and non-marine sedimentary rocks.

Attributes:
Area (square kilometres): 265600
State: SA
State: WA
Minimum present water depth (m): 0
Maximum present water depth (m): 2500
Main rock types: siliciclastic sediments and sedimentary rocks
Main depositional environment: marine and non-marine
Minimum sediment thickness (m): 0
Maximum sediment thickness (m): 2200
overlain by up to 400 m of Cainozoic strata
Present crustal setting: continental
Country: AUS

Parent: Bight Basin

Child Provinces: No data

Relationships:
Adjoins - Ceduna Sub-basin, Eyre Sub-basin, Recherche Sub-basin
Overlies - Polda Basin
Underlies - Eucla Basin

Constituent units: Hammerhead Supersequence, White Pointer Supersequence, Bronze Whaler Supersequence, Tiger Supersequence, Blue Whale Supersequence

Events: No data

Mineral Deposits: No data

Key Reference: Totterdell, J.M., Krassay, A.A. 2003, Sequence Stratigraphic correlation of onshore and offshore Bight Basin successions, Geoscience Australia. Record, 2003/02, 29 plus figures (Refid:24337)

Comments: No data

Overview: The Early to Late Cretaceous Madura Shelf is a newly defined component of the Bight Basin, incorporating a 265,500 sq. km platform north of the main rift system. The Madura Shelf has a broad onshore component, and extends offshore to water depths of up to 2500 m. Mesozoic sedimentary rocks on the Madura Shelf were deposited in areally restricted non-marine environments in the Early Cretaceous, through to increasingly marine environments followed by a small delta complex in the Late Cretaceous. The Madura Shelf is relatively unstructured, consisting of a basinward-thickening platform succession with some angular truncation beneath the Cainozoic Eucla Basin. Small half-graben structures may occur in western areas. It attains a maximum thickness of 2200 m beneath about 400 m of Cainozoic strata in the eastern offshore area. Cretaceous strata of the eastern Madura Shelf extend over older Neproterozoic, Permian and Jurassic strata of the Polda Basin, and a thin erosional remnant of Permian glacial deposits previously mapped as the Denman Basin. The offshore western extent of the Madura Shelf is characterised by a variable, but generally thin veneer (up to 600 m) of Mesozoic and possibly Permian strata. No hydrocarbons have been detected in the ten wells drilled on the Madura Shelf (Jan 2004). Potential source rocks include organic-rich lacustrine facies in the Lower Cretaceous Bronze Whaler supersequnce, and organic-rich marine shales in the Lower to Upper Cretaceous Blue Whale and White Pointer supersequences. Potential traps could form where strata onlap basement. However, long-range migration of hydrocarbons from adjacent depocentres is required for traps to be charged, as the depth of burial for Mesozoic strata on the Madura Shelf is insufficient for significant hydrocarbon generation. Potential reservoirs include the glauconitic sandstones of the Blue Whale and White Pointer supersequences, while marine shales of the Blue Whale and Tiger supersequences form potential seals.

Images: Eastern Bight Basin structural elements and cross-section location map (82 KB), Eastern Bight Basin regional cross-section Profile 1 (59 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)

Other media: No data

Source Information:

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This report was generated on Saturday, October 25, 2014 3:37:31 PM EST.