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Sydney Basin

Entity ID: 22351 Compiled by: Taubert, S. Year: 2002 Status: Informal

Last Revised: 2013

Rank: province Type: sedimentary Subtype: foreland Location: NSW On-shore and off-shore

Synonyms: NA Symbol: NA

Minimum age: Middle Triassic Age method: inferred, biostratigraphic correlation

Maximum age: Early Permian Age method: inferred, biostratigraphic correlation

Summary: The Sydney Basin is an on/offshore depocentre on Australia's eastern passive margin. It formed as a foreland complex during the Permo-Triassic and contains 4000 to 6000m of clastic, volcaniclastic and marine sediments.

Attributes:
Area (square kilometres): 64000
State: NSW
Minimum present water depth (m): 0
Maximum present water depth (m): 4500
Main rock types: sediments and sedimentary rocks with volcaniclastic debris
Main depositional environment: marine and non-marine
Minimum sediment thickness (m): 4000
Maximum sediment thickness (m): 6000
Resources: Coal - black
Resources: Gas
Present crustal setting: continental
Country: AUS

Parent: No data

Child Provinces: No data

Relationships:
Adjoins - Gunnedah Basin

Constituent units: Hawkesbury Sandstone, Newcastle Coal Measures, Clifton Subgroup, Gosford Subgroup, Farley Formation, Nymboida Coal Measures, Fyansford Formation, Singleton Supergroup, Pebbley Beach Formation, Wandrawandian Formation, Burralow Formation, Dalwood Group, Illawarra Coal Measures, Bulli Coal, Mulbring Siltstone, Wianamatta Group, Wasp Head Formation, Yarrunga Coal Measures, Greta Coal Measures, Lochinvar Formation, Moolarben seam, Bungaba seam, Archerfield Sandstone, Denman Formation, Liddell Middle Seam, Rowan Formation, Gloucester Coal Measures, Napperby Formation, Wards River Conglomerate, Waukivory Creek Formation, Mammy Johnsons Formation, Jilleon Formation, Bulahdelah Formation, Patonga Claystone, Adamstown Formation, Berkeley Latite Member, Lidsdale Coal, Lambton Formation, Kiama Sandstone Member, Coorongooba Creek Sandstone, State Mine Creek Formation, Craven Subgroup, Cullen Bullen Subgroup, Bowens Road Lower seam, Warners Bay Tuff, Burra-Moko Head Sandstone, Bumbo Latite Member, Mount York Claystone, Coal Cliff Sandstone, Saddleback Latite Member, Newnes Formation, Wombarra Claystone, Wallerawang Subgroup, Ulan seam, Doyles Creek Subgroup, Dapto Latite Member, Cambewarra Latite Member, Nobbys Tuff, Moon Island Beach Subgroup, Minnamurra Latite Member, Jamberoo Sandstone Member, Horseshoe Creek Subgroup, Bulgo Sandstone, Boolaroo Formation, Blackmans Flat Conglomerate, Banks Wall Sandstone, Bulli coal seam, Figtree coal seam, Tongarra coal seam, Fern Valley coal seam, Middle River seam, Allans Creek Sandstone, Gerringong Volcanics, Snapper Point Formation, Allandale Formation, Broughton Formation, Dempsey Formation, Four Mile Creek Subgroup, Marrangaroo Conglomerate, Rutherford Formation, Pigeon House Creek Siltstone, Waratah Sandstone, Wallis Creek Subgroup, Tomago Coal Measures, Grose Subgroup, Pheasants Nest Formation, Caley Subgroup, Talaterang Group, Saltwater Creek Formation, Shoalhaven Group, Shoalhaven Group, Upper, Maitland Group, Kulnura Marine Tongue, Vane Subgroup, Wenham Formation, Wallarah-Great Northern Coal, Erins Vale Formation, Wilton Formation, Narrabeen Group, Cessnock Sandstone Member, Vales Point coal seam, Gerringong volcanic facies, Bulga Formation, Gyarran Volcanics, Muree Sandstone, Bringelly Shale, Munmorah Conglomerate, Sydney Subgroup, Ashfield Shale, Dooralong Shale, Weismantels Formation, Speldon Formation, Leloma Formation, Terrigal Formation, Minchinbury Sandstone, Mittagong Formation, Tuggerah Formation, Jerrys Plains Subgroup, Crowthers Road Conglomerate, Bald Hill Claystone, Awaba Tuff, Apple Tree Flat Subgroup, Glen Davis Formation, Angus Place Sandstone, Bowens Road coal seam, Jo Doth Tuff Member, Arkarula Formation, Tamby Creek Formation, Caley Formation, Watts Sandstone, Glen Gallic Subgroup, Nile Subgroup, Cumberland Subgroup, Widden Brook Conglomerate, Cockabutta Creek Sandstone Member, Westley Park Sandstone Member, Skeletar Formation, Scarborough Sandstone, Colo Vale Sandstone, Charbon Subgroup, Pebbly Beach Formation, Irondale Coal, Gundangaroo Formation, Garie Formation, Five Islands Latite Member, Vales Point seam, Borehole seam, Nowra Sandstone, Tallong Conglomerate, Wollombi Coal Measures, Wittingham Coal Measures, Berry Siltstone, Durallie Road Formation, Avon Subgroup, Calderwood Latite Member, Wandrawandian Siltstone, Mount Marsden Claystone, Gap Sandstone, Blow Hole Latite Member

Events: No data

Mineral Deposits: No data

Key Reference: (Refid:-1)

Comments: No data

Overview: The Permo-Triassic Sydney Basin is an on/offshore basin located along Australia's eastern margin. The onshore basin lies in New South Wales, while the offshore basin extends into 4500m water depths. The basin covers 64,000 sq. km., with the onshore comprising 36,000 sq. km. and the offshore 28,000 sq. km. The Sydney Basin is part of a major basin system that extends over 1500 km from the Bowen Basin in Queensland. Onshore, the basin contains 4500m of Permo-Triassic clastic sediments, while the offshore basin contains 6000m of sediments. The basin overlies the Lachlan Fold Belt and Late Carboniferous volcaniclastic sediments. The basin formed by extension in the Early Permian, with half graben infilled by the Dalwood and Talaterang Groups. Foreland loading followed, with the compression of the Currarong Orogen in the Early Permian. Late Permian uplift associated with the New England foreland loading phase resulted in formation of depocentres within the northeast Sydney Basin. These depocentres filled with pyroclastic and alluvial-paludal sediments of the Newcastle Coal Measures. In the Triassic, uplift of the offshore basin resulted in reworking of Permian sediments in fluvial environments. The basin underwent a final phase of deformation (thrusting) in the Middle Triassic. Extension and breakup in the Tasman Basin, beginning in the Late Cretaceous, resulted in the current structural boundaries of the basin's eastern margin. A total of 115 wells have been drilled in the onshore basin, and none offshore (Nov 2002). The onshore basin contains rich coal deposits with associated natural gas and minor oil shows. The geochemistry of oil shows indicate a terrestrial source from a clay-rich environment, although not associated with the coal facies. The main trap types are anticlinal and overthrust, with some structural reactivation during Tasman Basin rifting.

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This report was generated on Wednesday, October 22, 2014 5:33:50 AM EST.