Carter, R. M. and Carter, L. (1992): Seismic imaging of Pleistocene deep-sea cyclothems; implications for sequence stratigraphy

Leg/Site/Hole:
DSDP 90
DSDP 90 594
Identifier:
1995-006052
georefid

Creator:
Carter, R. M.
James Cook University, Department of Geology, Townsville, Australia
author

Carter, L.
New Zealand Division of Water Science, New Zealand
author

Identification:
Seismic imaging of Pleistocene deep-sea cyclothems; implications for sequence stratigraphy
1992
Terra Nova
Blackwell, Oxford, United Kingdom
4
6
682-692
Plate collision along the New Zealand Alpine Fault since the late Miocene has resulted in an abundant supply of terrigenous sediment to an adjacent starved late Cretaceous rift-basin, the Bounty Trough. During the late Neogene, alternating pulses of terrigenous (glacial) and biogenic (interglacial) sediment were deposited in the trough in the form of deep-sea cyclothems, in sympathy with glacio-eustatic sea-level fluctuations. Individual cyclothems ranging up to 15 m in thickness have been directly imaged by both 3.5 kHz and single channel airgun profiling. They are particularly conspicuous on the continental slope and in areas of the trough under the influence of overbank turbidite deposition from the Bounty Channel. On the abyssal Bounty Fan, approximately 50 cyclothems have been deposited since the late Pliocene, ie. each cyclothem corresponds to two contiguous oxygen isotope stages. Each cyclothem also corresponds to the offshore conformity of a single 5th or 6th order seismic sequence, with the lower terrigenous portion marking a lowstand systems tract, and the upper, biopelagic part representing the transgressive and highstand systems tracts. Therefore, as a single continental margin sequence is traced seawards it passes from unconformity-bounded shelf and shelf-margin cyclothems, to slope sediments which include thick conformity-bounded deep-sea cyclothems or autocyclic canyon deposits, to thin conformity-bounded deep-sea cyclothems on the distal rise, and finally to cryptically cyclic biopelagic sediment and/or red clay on the abyssal plain.
English
Serial
Coverage:Geographic coordinates:
North:-45.3128
West:174.5652East: 174.5653
South:-45.3129

Stratigraphy; Applied geophysics; Australasia; Bounty Trough; Cenozoic; continental margin; cyclothems; Deep Sea Drilling Project; DSDP Site 594; geophysical methods; geophysical profiles; geophysical surveys; IPOD; Leg 90; New Zealand; Pacific Ocean; planar bedding structures; plate collision; plate tectonics; Pleistocene; Quaternary; sedimentary structures; seismic methods; sequence stratigraphy; surveys; West Pacific;

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