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Townsville Basin

Entity ID: 22406 Compiled by: Taubert, S. Year: 2002 Status: Defined

Last Revised: 2013

Rank: province Type: sedimentary Subtype: rift Location: QLD, CSIT Off-shore

Synonyms: Townsville Trough Symbol: NA

Minimum age: Recent Age method: inferred, biostratigraphic correlation

Maximum age: Late Jurassic Age method: inferred, seismic interpretation

Summary: The Jurassic to Recent Townsville Basin is a large, offshore basin that formed as an east-west trending rift between the Marion and Queensland Plateau, containing over 6500 m of siliciclastic and carbonate sediments.

Attributes:
Area (square kilometres): 30000
State: QLD
State: CSIT
Minimum present water depth (m): 200
Maximum present water depth (m): 2000
Main rock types: carbonate sediments and sedimentary rocks
Main rock types: siliciclastic sediments and sedimentary rocks
Main depositional environment: marine and non-marine
Maximum sediment thickness (m): 6500
Present crustal setting: continental
Country: AUS

Parent: No data

Child Provinces: No data

Relationships:
Adjoins - Marion Plateau [To the south.], Queensland Basin [Western Townsville Basin grades into southern Queensland Basin.], Queensland Plateau

Constituent units:

Events: No data

Mineral Deposits: No data

Key Reference: Struckmeyer, H.I.M., Symonds, P.A., Fellows, M.E., Scott, D.L. 1994, Structural and stratigraphic evolution of the Townsville Basin, Townsville Trough, offshore northeastern Australia, Australian Geological Survey Organisation. Record, 1994/50, (Refid:12656)

Comments: No data

Overview: The Townsville Basin is an east-west trending extensional basin located between the Queensland and Marion Plateaus offshore northeast Queensland, in water depths of 200 m to 2000 m. The basin is 450 km long and 20 to 120 km wide, underlies the bathymetric Townsville Trough, and is subdivided into several sub-basins. The basin fill occurs as two main megasequences that reflect the basin evolution from a rift basin with isolated depocentres to a sag basin with a more widespread distribution. The maximum sediment thickness is about 6.5 km. The oldest sediments are contained in a generally thin Upper Jurassic to Lower Cretaceous early synrift sequence with considerable variation in spatial distribution, and likely to consist of terrigenous deposits derived from the adjacent plateaus and intra-basin highs. This is overlain by up to 2 km of a more widespread synrift megasequence, deposited in a variety of environments, and inferred to be no younger than Paleocene in age. A Cainozoic sag-phase megasequence up to 3.8 km thick consists of drape fill clastics overlain by mainly carbonates. The Townsville Basin formed through oblique northwest to southeast extension resulting in a half-graben morphology. This early rifting event was separate to and predated extension related to later Coral and Tasman Sea opening. However, a second rift phase in the Early to Late Cretaceous may be related to these regional extensional events. Multiple reactivation events occurred throughout the Cainozoic. No wells have been drilled in the Townsville Basin, and its petroleum prospectivity is speculative. The western part of the basin lies within the Great Barrier Reef Marine Park, in which petroleum exploration is prohibited.

Images: No data

Other media: No data

Source Information:

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This report was generated on Saturday, November 1, 2014 6:18:42 AM EST.