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Maryborough Basin

Entity ID: 22345 Compiled by: Taubert, S. Year: 2002 Status: Defined

Last Revised: 2013

Rank: province Type: sedimentary Subtype: backarc Location: QLD On-shore and off-shore

Synonyms: NA Symbol: NA

Minimum age: Cenozoic Age method: inferred, biostratigraphic correlation

Maximum age: Late Triassic Age method: inferred, biostratigraphic correlation

Summary: The Late Triassic to Cainozoic Maryborough Basin is an onshore/offshore, frontier basin located in southeast Queensland. It contains up to 9500 m of marine and non-marine sediments with some volcanics.

Attributes:
Area (square kilometres): 16400
State: QLD
Minimum present water depth (m): 0
Maximum present water depth (m): 1000
Main rock types: sediments and sedimentary rocks with volcaniclastic debris
Main depositional environment: marine and non-marine
Maximum sediment thickness (m): 9500
Present crustal setting: continental
Country: AUS

Parent: No data

Child Provinces: No data

Relationships:
Interfingers - Nambour Basin
Overlies - Gympie Province

Constituent units: Brooweena Formation, Burrum Coal Measures, Duckinwilla Group, Elliott Formation, Gregory Sandstone Member, Kin Kin beds, Maryborough Formation, Myrtle Creek Sandstone, Pemberton Grange Basalt, Tiaro Coal Measures, Grahams Creek Formation, Mount Clara beds, Theodolite Siltstone, Cherwell Mudstone Member, Caramar Siltstone, Goodwood Mudstone, Isis Arenite, Woodgate Siltstone

Events: No data

Mineral Deposits: Burgowan, Cooloola, Inskip Point, Fraser Island, Colton, Maryborough Basin T9 West, Bundaberg

Key Reference: Hill, P.J. 1994, Geology and geophysics of the offshore Maryborough, Capricorn and northern Tasman Basins: results of AGSO Survey 91, Canberra, Australian Geological Survey Organisation Record 1994/1, 1994/1, (Refid:12543)

Comments: No data

Overview: The Maryborough Basin is located in southeast Queensland. The Maryborough Basin consists of up to 9500 m of Upper Triassic to Cainozoic sediments in water depths up to 1000 m. Four petroleum onshore exploration wells were drilled in the basin and all were dry except for gas shows in Gregory River 1 (Nov 2002). The basin overlies Permo-Triassic metasediments and granites and forms one of the thickest Mesozoic sedimentary sections in eastern Australia. During the Permian and Mesozoic, eastern Australia was in a back-arc tectonic setting dominated by a strike slip regime with eastward-stepping oblique extension. Maryborough Basin development involved transtensional rifting followed by thermal subsidence. The basin-fill consists of two main successions: (1) latest Triassic to mid Jurassic age continental sediments of the Duckinwilla Group, and (2) the latest Jurassic to Neocomian age Grahams Creek Formation and two conformable Early Cretaceous age units, the Maryborough Formation and Burrum Coal Measures. Sedimentation in the basin commenced with the deposition of thick fluvial quartzose sandstone (Myrtle Creek Sandstone). This was followed by the deposition of a coal measure sequence, which probably contains some marine units (Tiaro Coal Measures). A period of substantial volcanic activity terminated this sedimentation in the Early Cretaceous (Grahams Creek Formation). Sedimentation recommenced in the Aptian with a fluviatile sequence, which later gave way to marine conditions (Maryborough Formation). Deposition terminated with a fluviatile-lacustrine sequence (Burrum Coal Measures). Major folding and faulting in the Cretaceous to Early Tertiary resulted in significant erosion. A veneer of fluvial sediments and some basalts were deposited later in the Tertiary. Potential source rocks have been identified in the Jurassic and Cretaceous sequences. Possible reservoirs include the Myrtle Creek Sandstone, the lower parts of the Maryborough Formation, and sands within the Burrum Coal Measures and the Tiaro Coal Measures.

Images: No data

Other media: No data

Source Information:

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This report was generated on Friday, October 31, 2014 6:31:45 AM EST.