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Naturaliste Plateau

Entity ID: 22297 Compiled by: Borissova, I. Year: 2002 Status: Defined

Last Revised: 2013

Rank: province Type: sedimentary Subtype: polyhistory Location: WA Off-shore

Synonyms: NA Symbol: NA

Minimum age: Recent Age method: inferred, biostratigraphic correlation

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

Summary: The Naturaliste Plateau is a large submarine plateau lying off the southwestern tip of mainland Australia to the west of Cape Leeuwin and Cape Naturaliste.

Attributes:
Area (square kilometres): 77000
State: WA
Minimum present water depth (m): 1700
Maximum present water depth (m): 5000
Main rock types: siliciclastic sediments and sedimentary rocks
Main rock types: carbonate sediments and sedimentary rocks
foram and nannofossil ooze, chalk
Main depositional environment: marine and non-marine
Maximum sediment thickness (m): 2500
Present crustal setting: continental
Country: AUS

Parent: No data

Child Provinces: No data

Relationships:
Adjoins - Mentelle Basin, western Mentelle Basin

Constituent units:

Events: No data

Mineral Deposits: No data

Key Reference: Borissova, I. 2002, Geological framework of the Naturaliste Plateau, Geoscience Australia. Record, 2002/20, 44 (Refid:13489)

Comments: No data

Overview: The Naturaliste Plateau is a large submarine plateau lying off the southwestern tip of mainland Australia to the west of Capes Leeuwin and Naturaliste. The eastern half of the plateau lies within Australia's Exclusive Economic Zone (AEEZ). A large number of small rift basins on the Naturaliste Plateau were formed prior to the breakup in the Perth Abyssal Plain, which borders the plateau to the north. Recovery of continental rocks on the southern margin of the plateau, and the presence of sedimentary sequences similar to those in the Perth Basin suggest that the plateau is underlain mostly by continental crust. The plateau is surrounded by a wide continent-ocean transition (COT) zone. The northern COT formed as part of the volcanic rifted margin associated with the Valanginian breakup in the Perth Abyssal Plain. The southern COT probably formed in Barremian to Cenomanian during continental extension between the Naturaliste Plateau and its conjugate feature off Antarctica, the Bruce Rise. Small rift basins mapped on the plateau contain up to 2.5 km of possibly Upper Jurassic to Lower Cretaceous sediments. Insufficient sediment thickness in these basins indicates poor petroleum prospectivity. However, if the Naturaliste Plateau basement beneath these basins is composed of Late Palaeozoic rocks, the whole plateau, including rift basins may have some petroleum potential.

Images: Naturaliste Plateau and Mentelle Basin structural elements map (118 KB), Naturaliste Plateau sequence stratigraphy and tectonic events (84 KB), Naturaliste Plateau regional cross-section Profile A-A' (82 KB), Naturaliste Plateau and Mentelle Basin regional cross-section Profile B-B' (59 KB)

Other media: No data

Source Information:

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This report was generated on Saturday, August 30, 2014 6:25:13 AM EST.