Shallow seismic structure of the continental shelf, Southeast Australia

Davies, Peter J.

doi:10.1080/00167617508728901

Cited by 24 publications

(11 citation statements)

References 20 publications

(22 reference statements)

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“…The early Neogene exhumation is documented by Japsen et al (2010). (F) Offshore SE Australia (34°S); Truncations are above pre-rift rocks whereas syn-rift sediments are missing (base-Cenozoic and Pliocene dating according to Davies, 1975). Note that low-angle unconformities may be especially difficult to identify as erosional truncations and consequently that all truncations may not have been identified on these profiles.…”

Section: Brazilmentioning

confidence: 95%

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Elevated, passive continental margins: Not rift shoulders, but expressions of episodic, post-rift burial and exhumation

Japsen

Chalmers

Green³

et al. 2012

Global and Planetary Change

136

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Section: Brazilmentioning

confidence: 95%

“…The stratigraphy offshore eastern Australia is poorly known, but Davies (1975) interpreted two pronounced unconformities to represent phases of post-rift, erosional truncations (Fig. 3F).…”

Section: Se Australiamentioning

confidence: 97%

Elevated, passive continental margins: Not rift shoulders, but expressions of episodic, post-rift burial and exhumation

Japsen

Chalmers

Green³

et al. 2012

Global and Planetary Change

136

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“…Most of the evidence to date supporting tectonic lowering of the coastal zone in southeast New South Wales has been presented in papers by Ollier (1978, 1982), Ollier and Taylor (1988), and Ollier and Pain (1994). In general it is based on regional variations in the general level of the landscape and the levels of ancient erosion surfaces, analysis of drainage patterns, and seismic evidence for the geometry of the offshore sediment basement and thicknesses of offshore sediments ( Davies 1975).…”

Section: Direct Evidence For Cenozoic Downwarp and Faulting In The Comentioning

confidence: 99%

Cenozoic tectonics and landform evolution of the coast and adjacent highlands of southeast New South Wales

Brown¹

2000

Australian Journal of Earth Sciences

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This paper has been written firstly to dispel a widely held notion that the structure and stratigraphy of Permian and Triassic sedimentary rocks of the southern Sydney Basin precludes post‐Permian tectonic lowering of the coastal zone of southeast New South Wales with respect to the highlands; and secondly to present evidence of Cenozoic tectonic lowering of the coastal zone by gentle tilting and, locally, by faulting. The apparent horizontal attitude of Triassic sandstone in an east–west section inland from Nowra precludes later faulting or steep monoclinal folding in this immediate area, but does not preclude geomorphically significant tilting or gentle warping; and it places no constraints on the tectonic and geomorphic history in areas south of the sandstone outcrop. The form of an Oligocene erosion surface around Ulladulla, and the distribution of older rock units below this surface are also not incompatible with significant Cenozoic tectonism. Near Ulladulla, Mogo, Moruya, and Merimbula, mid‐Cenozoic non‐marine sediments and basalts in north–south‐trending palaeovalleys dip gently seaward at angles around 1°—about the same as the eastward slope of the offshore seismic basement and also similar to the average slope between the coastal zone and inland plateaux; indicating that the coastal zone and continental shelf have been downwarped relative to the inland plateaux in these areas. The area between Brooman, on the Clyde River, and the coast between Termeil and Bateman’s Bay, has been lowered by Cenozoic faulting. The steep slope on the west side of the Clyde River is a dissected 200–300 m fault scarp, and there are two other east‐facing fault scarps between the Clyde River and the coast. Fault blocks between the Clyde River and the coast are gently backtilted to the west. Further south, there may be more faults and tilt blocks between Bateman’s Bay and Moruya. Tectonic lowering of the coastal zone and continental shelf appears to be mostly post‐mid‐Cenozoic. This suggests that marine shelf sediments are likely to be not older than Miocene. There could also be older Cenozoic non‐marine sediments and perhaps basalts in palaeovalleys at the base of the section.

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“…Only in this area is a major unconformity separating offlapping from overlying onlapping strata found. This location coincides with an area where the escarpment has retreated -50 km more in a landward direction than elsewhere (after seismic data from [30]). See text for further discussion.…”

Section: Shelf Antarcticamentioning

confidence: 99%

“…The rifting caused opening of the central Tasman Sea and uplift of the margin [10,11,30,31]. The passive margin fill consists of a very thin ( u 500 m> and narrow (N 30 km) sedimentary wedge containing Tertiary to Recent elastic sediments [30].…”

Section: The Southeastern Australian Passive Marginmentioning

confidence: 99%

The effect of riftshoulder erosion on stratal patterns at passive margins - Implications for sequence stratigraphy

Balen¹,

Beek²,

Cloetingh³

1996

Proceedings

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Numerical modelling indicates that the erosion of uplifted rift flanks at passive margins has a profound effect on offshore stratigraphic patterns. Flexural uplift, due to isostatic rebound in response to erosion, extends far into the basin and causes uplift of the shelf. As a result, the contemporaneously deposited sedimentary wedge displays a characteristic offlap pattern. When the rift shoulder is largely eroded, onlap-promoting mechanisms related to cooling of the lithosphere enable sediments to onlap onto the basin margin. The initial offlapping and subsequent onlapping strata form one complete second-order depositional sequence comprising a shelf-margin-, transgressive-and highstand-systems tract. The modelling inferences are in broad agreement with strata1 patterns and basin geometries observed on the U.S. east coast, the southeastern Brazilian and southeastern Australian passive margins and the Transantarctic Mountains-Ross Sea Shelf system. The initial offlaps caused by erosion of rift shoulders have important implications for the deriviation of eustatic signals from coastal onlap patterns.

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Shallow seismic structure of the continental shelf, Southeast Australia

Cited by 24 publications

References 20 publications

Elevated, passive continental margins: Not rift shoulders, but expressions of episodic, post-rift burial and exhumation

Elevated, passive continental margins: Not rift shoulders, but expressions of episodic, post-rift burial and exhumation

Cenozoic tectonics and landform evolution of the coast and adjacent highlands of southeast New South Wales

The effect of riftshoulder erosion on stratal patterns at passive margins - Implications for sequence stratigraphy

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