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Hillsborough Basin

Entity ID: 22353 Compiled by: Taubert, S. Year: 2002 Status: Defined

Last Revised: 2013

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

Synonyms: NA Symbol: NA

Minimum age: Eocene Age method: inferred, seismic interpretation

Maximum age: Paleocene Age method: inferred, biostratigraphic correlation

Summary: The Hillsborough Basin is a small, coast-straddling Paleogene rift basin in eastern Queensland. It contains up to 3 km of fluvial, clastic sediments offshore, and the Condor Oil Shale onshore.

Attributes:
Area (square kilometres): 1300
State: QLD
Maximum present water depth (m): 20
Main rock types: siliciclastic sediments and sedimentary rocks
Main rock types: organic-rich sediments and sedimentary rocks
Main depositional environment: non-marine
some marine influence possible
Maximum sediment thickness (m): 3000
Resources: Oil shale
oil shale; Condor Oil Shale Deposit
Present crustal setting: continental
Country: AUS

Parent: No data

Child Provinces: No data

Relationships: None

Constituent units: Cape Hillsborough beds

Events: No data

Mineral Deposits: No data

Key Reference: Gray, A.R.G. 1976, Hillsborough Basin IN Economic Geology of Australia and Papua New Guinea. 3. Petroleum. Leslie, R.B., Evans, H.J., & Knight, C.L. (Editors), AusIMM. Monograph Series, 7, p460-464 (Refid:23839)

Comments: The Hillsborough Basin overlies the Campwyn Block of the Yarrol Province of the New England Orogen.

Overview: The Hillsborough Basin straddles the east coast of Queensland north of Mackay. The basin covers 1300 sq. km, most of which lies offshore in water depths up to 20 metres. The Hillsborough Basin contains up to 1250 m of Paleogene sediments overlying Upper Devonian to Lower Carboniferous sediments and volcanics onshore, but on seismic evidence may reach a thickness of up to 3000 m offshore. The Hillsborough Basin is one of four structural blocks in the Proserpine area, along with the Midgeton Block to the west and possibly southeast, the Airlie Block in the northeast, and the Whitsunday Block in the east. The Hillsborough Basin developed as a narrow southeast trending asymmetrical graben on the eastern side of the Midgeton Block during a phase of Late Cretaceous or Paleogene faulting. Sediments accumulated in the graben during the Paleogene; and the thickest known section is offshore along the northeast margin of the basin. The sedimentary fill (Cape Hillsborough beds) is largely composed of sandstone, mudstone and minor conglomerate; the depositional environment was probably entirely non-marine. Oligocene volcanic flows and intrusions are present in the south of the basin at Cape Hillsborough, an onshore horst feature. The stratigraphy of the offshore Hillsborough Basin is largely unknown as there are no wells, and only poor quality seismic data. Oil shale and lignite are present within the Cape Hillsborough beds, including the Condor Oil Shale deposit, located to the south of Proserpine in the northwestern part of the basin. The offshore part of the Hillsborough Basin lies entirely 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 Wednesday, July 30, 2014 4:54:46 AM EST.