Current modification of a mass failure deposit on the continental shelf, North Canterbury, New Zealand

Carter, L; Carter, R.M

doi:10.1016/0025-3227(85)90117-3

Marine Geology

1985

DOI: 10.1016/0025-3227(85)90117-3

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Current modification of a mass failure deposit on the continental shelf, North Canterbury, New Zealand

L Carter

R.M Carter

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Cited by 11 publications

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“…Certainly, in other seismic areas, failures of continental shelf and slope sediments have been recorded on the seafloor with inclinations as low as 0.4° ( Lewis 1971;Herzer & Lewis 1979;Carter & Carter 1985). In Cook Strait, evidence of failure outside canyons is unclear, probably because widespread seafloor erosion has either modified or removed such deposits.…”

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Acoustical characterisation of seafloor sediments and its relationship to active sedimentary processes in Cook Strait, New Zealand

Carter¹

1992

New Zealand Journal of Geology and Geophysics

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3.5 kHz seismic profiles are used to characterise the seabed in Cook Strait. The various acoustical responses have been classified into nine groups or echo-types which, together with sediment samples, photographs, and side-scan sonography, provide an insight into modern erosional and depositional.processes operating in the strait.Much of northern Cook Strait is underlain by semiconsolidated, late Pleistocene sediments that are eroded by strong, tide-dominated currents even at depths >200 m. Locally, erosion of these deposits is impeded by a lag gravel pavement that occupies much of the 150-350 m deep central strait. The same strong currents effectively transport bedload along the Wellington continental shelf, which is a rocky platform with a patchy veneer of mobile sand and gravel. Outside the main tidal stream, within semiprotected embayments, deposition is manifest by prominent sediment bodies of mud and sand prograding across the inner-middle shelf. Seaward of the shelf, in southern Cook Strait, the seafloor is dissected by a complex of submarine canyons that appear to syphon off tidally transported sand to the nearby Hikurangi Trough. However, in at least one place, transport is impeded by a slide blocking the canyon axis. Outside submarine canyons, products of gravitational mass movement are not conspicuous, even though Cook Strait lies across a zone of high seismicity. This scarcity of evidence is, in part, attributed to current modification of any such deposits.

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Acoustical characterisation of seafloor sediments and its relationship to active sedimentary processes in Cook Strait, New Zealand

Carter¹

1992

New Zealand Journal of Geology and Geophysics

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Sea-level controls on the post-glacial development of the Great Barrier Reef, Queensland

Carter

Johnson

1986

Marine Geology

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Collapse and flow of lowstand shelf-margin deposits: An example from the eastern Tyrrhenian Sea, Italy

Trincardi¹,

Field²

1992

Marine Geology

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Current modification of a mass failure deposit on the continental shelf, North Canterbury, New Zealand

Cited by 11 publications

References 11 publications

Acoustical characterisation of seafloor sediments and its relationship to active sedimentary processes in Cook Strait, New Zealand

Acoustical characterisation of seafloor sediments and its relationship to active sedimentary processes in Cook Strait, New Zealand

Sea-level controls on the post-glacial development of the Great Barrier Reef, Queensland

Collapse and flow of lowstand shelf-margin deposits: An example from the eastern Tyrrhenian Sea, Italy

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