Migration history of a fine-grained abyssal sediment wave on the Bahama Outer Ridge

Flood, Roger D.; Giosan, Liviu

doi:10.1016/s0025-3227(02)00558-3

Cited by 33 publications

(11 citation statements)

References 43 publications

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“…5b). These features are consistent with those observed from bottom current sediment waves Flood and Giosan, 2002;Lewis and Pantin, 2002;Masson et al, 2002;Hohbein and Cartwright, 2006;MacLachlan et al, 2008). Damuth (1979) also suggested that the sediment waves in field 2 shared many similarities with bottom current sediment waves.…”

Section: The Genesis Of the Sediment Waves In Fieldsupporting

confidence: 82%

Sediment waves on the South China Sea Slope off southwestern Taiwan: Implications for the intrusion of the Northern Pacific Deep Water into the South China Sea

Gong

Wang

Peng

et al. 2012

Marine and Petroleum Geology

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Section: The Genesis Of the Sediment Waves In Fieldsupporting

confidence: 82%

Sediment waves on the South China Sea Slope off southwestern Taiwan: Implications for the intrusion of the Northern Pacific Deep Water into the South China Sea

Gong

Wang

Peng

et al. 2012

Marine and Petroleum Geology

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“…The crests of the sediment waves associated with channels are usually aligned approximately perpendicular to the adjacent channel (Wynn and Stow, 2002) or normal to the presumed direction of over-bank flow. The waves are commonly slightly asymmetric with steeper upslope faces (Migeon et al, 2000) and migrate upslope due to preferential deposition of sediment on the upstream side (Flood and Giosan, 2002).…”

Section: Other Sedimentary Features On External Leveesmentioning

confidence: 99%

Genesis and character of thin-bedded turbidites associated with submarine channels

Hansen

Callow

Kane

et al. 2015

Marine and Petroleum Geology

117

129

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Submarine channel related thin-bedded turbidites are deposited in environments such as external levees, internal levees, depositional terraces and at times of channel abandonment.Thin-bedded turbidites are defined as beds that are less than 10cm thick, but the described environments can at times contain beds up to 50cm thick which would be classified as medium or thick-bedded (Boggs, 2006). This paper addresses many examples of these environments from the modern seafloor, outcrop and the subsurface to suggest criteria that assist in the differentiation of levees and terraces from an architectural, sedimentological, M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 2 ichnological and hydrocarbon reservoir perspective. External levees confine channel belts and are elongate sedimentary deposits that are a product of over-spill of turbidity currents from the channel belt they confine. External levees often have predictable vertical, lateral and downstream changes but can commonly be modified by collapse of the inner external levee into the channel, collapse on the outer external levee, sediment waves, and interaction of external levees with topographic features such as other channels, other external levees, basin margins or previous slump/slide blocks, which can greatly modify the sand distribution within them.A combination of internal levees, depositional terraces and slide blocks of external levee sediment make up thin-bedded turbidites within channel belts. We differentiate between wedge shaped internal levees and topographically flat or subdued depositional terraces whose differing geometries and sand distribution reflect the fact that the flow processes involved in the formation of these deposits are different. The characteristic wedge shape of an internal levee requires sufficient space within the channel belt for the over-spilling current to decelerate and deposit the majority of its suspended sediment before reaching the bounding topography of the channel belt. In the case of depositional terraces the space available in the channel belt is insufficient for the current to deposit the majority of its sediment before reaching the bounding topography of the channel belt, creating confined sheet-like deposits.External levees, internal levees and depositional terraces have distinct sedimentological characteristics such as sand bed thickness trends and sedimentary structures that can be used to distinguish them. Together with sedimentological characteristics, in some systems these thin-bedded turbidite deposits contain distinctive trace fossil assemblages, where channel proximal deposits such as proximal external levees, internal levees and depositional terraces M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 3 can have much higher biodiversity than sand-rich channel axes and more mud-dominated outer external levees.The depositional sites for internal levees and depositional terraces within channel belts can be formed by various processes such as entrenchment, point bar accretion, meander bend cutoff, ...

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“…4). In general, giant sediment waves migrate up-current when they develop on relatively flat seabed, and up-slope and upcurrent at an angle to the mean current when they develop on a slope (Blumsack and Weatherly, 1989;Hopfauf and Spiess, 2001;Flood and Giosan, 2002;Wynn and Masson, 2008). Therefore, it is difficult to accurately determine the mean bottom current direction from sediment waves that develop on a slope.…”

Section: Paleocurrent Direction Indicatorsmentioning

confidence: 99%

Geophysical evidence for widespread Cenozoic bottom current activity from the continental margin of Nova Scotia, Canada

Campbell

Mosher

2016

Marine Geology

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Migration history of a fine-grained abyssal sediment wave on the Bahama Outer Ridge

Cited by 33 publications

References 43 publications

Sediment waves on the South China Sea Slope off southwestern Taiwan: Implications for the intrusion of the Northern Pacific Deep Water into the South China Sea

Sediment waves on the South China Sea Slope off southwestern Taiwan: Implications for the intrusion of the Northern Pacific Deep Water into the South China Sea

Genesis and character of thin-bedded turbidites associated with submarine channels

Geophysical evidence for widespread Cenozoic bottom current activity from the continental margin of Nova Scotia, Canada

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