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Georgina Basin

Entity ID: 529556 Compiled by: Stewart, A.J. Year: 2010 Status: Defined

Last Revised: 2015

Rank: province Type: sedimentary Subtype: intracratonic Location: NT, QLD On-shore

Synonyms: NA Symbol: NA

Minimum age: Devonian, 392 ± 0 Ma Age method: inferred, biostratigraphic correlation

Maximum age: Neoproterozoic, 840 ± 0 Ma Age method: inferred, biostratigraphic correlation

Summary: The frontier large intracratonic Neoproterozoic to Late Devonian Georgina Basin of western Queensland and east central Northern Territory contains up to 5km of marine and nonmarine siliciclastics and carbonates.

Attributes:
Area (square kilometres): 330000
State: NT
State: QLD
Main rock types: siliciclastic sediments and sedimentary rocks
Main rock types: phosphate-sediments and phosphorites
Main rock types: carbonate sediments and sedimentary rocks
Main depositional environment: marine and non-marine
Maximum sediment thickness (m): 5000
Resources: Phosphate
phosphate in western Queensland
Present crustal setting: continental
Country: AUS

Parent: No data

Child Provinces: No data

Relationships:
Interfingers - Wiso Basin [Inferred, no exposure]
Overlies - Aileron Province [Regional unconformity], McArthur Basin
Underlies - Eromanga Basin

Constituent units: Adam Shale, Age Creek Formation, Ardmore Chert Member, Arrinthrunga Formation, Arthur Creek Formation, Beetle Creek Formation, Black Stump Arkose, Blazan Shale, Bukalara Sandstone, Carlo Sandstone, Central Mount Stuart Formation, Chatsworth Limestone, Coolibah Formation, Cravens Peak beds (In Toko Syncline; continental), Currant Bush Limestone, Devoncourt Limestone, Dulcie Sandstone (In Dulcie Syncline; continental), Elkera Formation, Elyuah Formation, Georgina Limestone, Grant Bluff Formation, Gum Ridge Formation, Helen Springs Volcanics, Inca Formation, Keepera Group (Glacial outwash and till), Kelly Creek Formation, Little Burke Tillite, Mail Change Limestone, Mithaka Formation, Monastery Creek Phosphorite Member, Mopunga Group (Siliciclastics), Mount Baldwin Formation, Mount Birnie beds, Mount Cornish Formation, Mungerebar Limestone, Ninmaroo Formation, Nora Formation, O'Hara Shale, Oorabra Arkose, Pomegranate Limestone, Quita Formation, Riversdale Formation, Roaring Siltstone, Selwyn Range Limestone, Split Rock Sandstone, Steamboat Sandstone, Sun Hill Arkose, Swift Formation, Sylvester Sandstone, Thorntonia Limestone, Toko Group (Marine siliciclastics), Top Springs Limestone, V-Creek Limestone, Vaughan Springs Quartzite, Yackah beds, Amesbury Quartzite, Andagera Formation, Boko Formation, Gnallan-a-gea Arkose, Gowers Formation, Neutral Junction Formation, Octy Formation, Cox Formation, Ethabuka Sandstone, Yardida Tillite, Chabalowe Formation, Hagen Member, Ranken Limestone, Eurowie Sandstone Member, Barkly Group, Plenty Group (Fluviatile quartzite, marine carbonate, lacustrine to deep marine sediments), Aroota Group (Tillite and diamictite), Shadow Group (Siliciclastics and carbonate), Narpa Group (Carbonates and siliciclastics), Cockroach Group (Carbonates), Tomahawk Formation, Wonnadinna Dolostone, Red Heart Dolostone, Camooweal Dolostone, Wonarah Formation, Kiana Group, Kalkarindji Suite, Anthony Lagoon Formation

Events: Alice Springs Orogeny, Delamerian Orogeny, Petermann Orogeny, Cenozoic reactivation, Rinkabeena Movement, Larapinta Event

Mineral Deposits: Paradise North, Wonarah, Phantom Hills, D-Tree, Paradise South, Lily Creek, Mount O'Connor, Ardmore, Sherrin Creek, Babbling Brooke Hill, Quita Creek, Riversleigh, Alroy, Duchess, Alexandria, Mount Jennifer, Highland Plains, Thorntonia, Korella, Ammaroo Phosphate, Arganara, Buchanan Dam, Steamboat-Blazan Creek, East Galah Creek

Key Reference: Dunster, J.N., Kruse, P.D., Duffett, M.L., Ambrose, G.J. 2007, Geology and resource potential of the southern Georgina Basin, Northern Territory Geological Survey, Digital Information Package, 007, 1-232 (Refid:64068)

Comments: The Toomba Fault on the basin's southern margin was reactivated in the Cenozoic. Strat units updated according to Geology and mineral resources of the Northern Territory (in prep., 68235)

Overview: The intracratonic Neoproterozoic to Late Devonian Georgina Basin is located in western Queensland and east central Northern Territory. It has a maximum sediment thickness of up to 5,000 m in the south (Toko and Dulcie Synclines) and east (Burke River Belt), with a much thinner succession in the central and northern parts of the basin (Barkly and Undilla Sub-basins). Deposition commenced during an extensional event in the Neoproterozoic, followed by a period of thermal subsidence. This resulted in the accumulation of marine siliciclastics and carbonates. This marine succession is overlain by marine, fluvial and glacigene sediments associated with the Sturtian and Marinoan glaciations. Subsequent marine siliciclastic and minor carbonate sedimentation extended into the latest Proterozoic. The Petermann Ranges Orogeny, with extensive uplift of the Musgrave Block fed deposition of widespread fluvial and marine siliciclastics during the latest Proterozoic-Early Cambrian. This was followed by deposition of a succession of marine siliciclastics and carbonates with minor evaporites for most of the remainder of the Cambrian. Deposition ceased in the northern part of the basin late in the Middle Cambrian. In the latest Cambrian, the Delamerian Orogeny resulted in some deformation of the basin. Extension in the mid-Ordovician (Larapinta Event) resulted in predominantly marine siliciclastic deposition in the southwest, with carbonate deposition continuing in the southeast. This pattern persisted until deposition ceased during the Middle Ordovician. In the Early to Late Devonian, the Arunta Block was uplifted during a phase of the Alice Springs Orogeny and fluvial siliciclastics deposited along the southern margin of the basin. The basin contains extensive early Middle Cambrian potential hydrocarbon source rocks in the southern part of the basin. Numerous oil shows and an uneconomic gas flow in Ethabuka 1 have been encountered, and the basin has recently been the focus of shale gas and shale oil exploration. The Georgina Basin has world-class phosphorite deposits, many small occurrences of Cu, Pb, Zn, Mn, and several turquoise occurrences.

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This report was generated on Thursday, May 28, 2015 8:30:25 PM EST.