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Gower Basin

Entity ID: 33443 Compiled by: Taubert, S. Year: 2001 Status: Defined

Last Revised: 2013

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

Synonyms: NA Symbol: NA

Minimum age: Recent Age method: inferred, seismic interpretation

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

Summary: The frontier Gower Basin is part of the Central Rift Zone of the Lord Howe Rise. The Gower Basin contains a Late Jurassic to Recent sedimentary succession up to 4000m in thickness.

Attributes:
Area (square kilometres): 106000
State: NSW
Minimum present water depth (m): 750
Maximum present water depth (m): 3000
Main rock types: sediments and sedimentary rocks with volcaniclastic debris
Main depositional environment: marine and non-marine
Maximum sediment thickness (m): 4000
But 'basement' problematical
Country: AUS

Parent: No data

Child Provinces: No data

Relationships:
Adjoins - Capel Basin [to the north], Faust Basin, Lord Howe Basin [to the west], Lord Howe Platform [to the east], Monawai Basin [to the south], Moore Basin

Constituent units:

Events: No data

Mineral Deposits: No data

Key Reference: Willcox, J.B., Sayers, J. 2002, Geological framework of the central Lord Howe Rise (Gower Basin) region with consideration of its petroleum potential, Geoscience Australia. Record, 2002/11, (Refid:13939)

Comments: No data

Overview: The Gower Basin covers an area of 106,000 sq. km and is the main depocentre within the Central Rift Zone of the Lord Howe Rise. It lies within the Exclusive Economic Zone around Lord Howe Island. This remote frontier basin contains a probable Upper Jurassic to Recent sedimentary succession with a maximum thickness of 4000 m, overlying continental crust presumed to be Lachlan Fold Belt. The basin has not been penetrated by drilling, and the age and nature of its basin-fill are inferred from seismic images and comparisons to the Gippsland and Bass basins. The petroleum potential of the Gower Basin is speculative due to the lack of hard data. However, seismic images across the basin show large half-graben structures, large diapir-like features and a range of possible play types within both the syn-rift and post-rift successions. Amplitude anomalies are evident on some seismic images, but some of these anomalies are probably due to volcanics within the basin-fill. One major uncertainty is the thermal maturity of potential source rocks within the basin given the relatively thin overburden. Plate reconstructions place the southern part of the Gower Basin against the Gippsland Basin, and the two basins probably shared a similar history until break-up in the latest Santonian to early Campanian. The Gower Basin formed by oblique extension, with later inversion and shortening. It comprises a series of northnorthwest-trending horsts and grabens offset by northeast-trending accommodation zones. Two syn-rift phases are recognised that bear close analogy to those in the Durroon Sub-basin of the Bass Basin. The Upper Jurassic to mid-Cretaceous section is interpreted to largely comprise a fluvio-lacustrine sedimentary succession. From the late Santonian to Eocene, following break-up, there was a change to marginal or restricted marine conditions. By the mid-Oligocene full marine conditions prevailed. From the Miocene onwards the strata have been broadly folded in response to compression along the plate boundary to the northeast.

Images: No data

Other media: No data

Source Information:

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This report was generated on Wednesday, October 22, 2014 4:29:47 PM EST.