Computer enhanced GLORIA sidescan sonar images of the surface of the Mississippi Fan

Wen, Renjun; Sinding-Larsen, Richard; Kenyon, Neil H.

doi:10.1007/978-94-011-1234-5_44

Cited by 6 publications

(3 citation statements)

References 8 publications

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“…Slope angles in this section vary between 0.51 and 0.251 (Bouma et al, 1984(Bouma et al, , 1985aShor, 1985, 1986;Pickering et al, 1986). Early seismic-based studies provided information on the cross-sectional morphology of Mississippi Channel (Stuart and Caughey, 1976;Moore et al, 1978) but, as with Amazon Fan, it was not until planform mapping of the fan surface was undertaken with GLORIA sidescan sonar, that the sinuous nature of the channel was fully revealed (Garrison et al, 1982;Shor, 1985, 1986;Wen et al, 1995). Relative to Amazon Fan, sinuosity on Mississippi Fan is generally lower (maximum 1.7) and sinuous loops are smaller in dimensions (Kastens and Shor, 1986).…”

Section: Mississippi Fanmentioning

confidence: 96%

Sinuous deep-water channels: Genesis, geometry and architecture

Wynn

Cronin

Peakall

2007

Marine and Petroleum Geology

272

200

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Section: Mississippi Fanmentioning

confidence: 96%

Sinuous deep-water channels: Genesis, geometry and architecture

Wynn

Cronin

Peakall

2007

Marine and Petroleum Geology

272

200

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“…A series of overlapping elongate sedimentary deposits (lobes) comprise the distal part of the submarine fan beyond the main channel (Figs. 1, 2;Twichell et al 1991;Wen et al 1995;Paskevich et al 2000;Twichell et al 2009). A more detailed side scan sonar survey using the 27-30 kHz SeaMARC 1A system showed that one of the larger lobes mapped by GLORIA was broken into several sub-lobes Twichell et al 1995).…”

Section: Mississippi Fan Gulf Of Mexico: Regional Setting and Previomentioning

confidence: 99%

How Did Thin Submarine Debris Flows Carry Boulder-Sized Intraclasts for Remarkable Distances Across Low Gradients to the Far Reaches of the Mississippi Fan?

Talling¹,

Wynn²,

Schmmidt³

et al. 2010

Journal of Sedimentary Research

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Submarine density flows dominate sediment transport into many parts of the ocean and form submarine fans, which are some of the largest sediment accumulations on Earth. Previous studies often assumed that the distal fringes of submarine fans would be dominated by extensive sheet-like deposits from dilute and expanded turbidity currents, because only turbidity currents would transport large volumes of sediment for long distances across such low gradients. Deposits with a remarkable frondlike shape occur at the furthest fringe of the Mississippi submarine fan. Understanding the emplacement process of these deposits is important because their frondlike shape suggests deposition from debris flows rather than turbidity currents. Previous analyses concluded that these deposits comprise a complex arrangement of thin interbedded turbidity current and debris flow deposits. Here we propose a different internal geometry for the frondlike deposits. Intervals previously described as in place turbidites are interpreted to be clasts within a single debrite interval that is , 1 to 2 m thick. This debrite interval is underlain by clean sand. The debrite interval could have been emplaced by multiple debris flows, or one event comprising multiple pulses. Clasts in the debrite interval are much bigger than previously thought, including boulders with diameters that can exceed 50 cm. We show that thin (, 2 m) and extremely fluidal debris flows could have carried these boulders across gradients of only 0.06u to the fringes of one of the world's largest submarine fans, without hydroplaning. This long transport distance could occur if the density of the clasts was less than that of the surrounding debris flow. Emplacement of the basal clean sand layer appears closely linked to debris flow deposition because the clean sand layer pinches out in a location similar to that of the overlying debrite. We therefore suggest that the basal clean sand most likely settled out from the overlying debris flows, and that the clean sand is not a fore running turbidity current deposit. Shearing at the base of a mud-rich debris flow would most likely produce a muddy basal sand interval, rather than the clean sand that is observed. This basal sand interval is therefore less likely to be a record of a lubricating layer with high-pore-fluid-pressure on which the debris flows moved. This study shows how thin and highly mobile debris flows can redistribute large volumes of sediment including bouldersized clasts long distances into the deep ocean across remarkably low gradients.

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“…Like channels that comprising major part of modern Mississipian fan and Amazon Fan (Pickering et al, 1986;Wen et al, 1995;Wynn et al, 2007), the sinuous single deepwater channel in Alaminos canyon develops in area with similar low slope angles (<0.5 o ), but the sinuosity on channel in Alaminos fan is really lower (<1.3). Also, like other channels in Missippian fan (Kastens and Shor, 1986) and deepwater channels in West Africa (Peakall et al, 2000;Kolla et al, 2001), the sinuosity increases upward and channel narrows upward, but does not have obvious down-channel migration and sinuous loops did not arise in this area.…”

Section: Discussionmentioning

confidence: 97%

Seismic Geomorphology and Geometric Evolution of a Single Base-of-Slope Deepwater Channel in the near Seafloor of Alaminos Canyon, Northwestern Deep Gulf of Mexico

Jiang

Henriksen

Weimer

2011

Energy Exploration & Exploitation

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The main goal of this article is to investigate the seismic geomorphology and geometric evolution of the single base-of-slope deepwater channel within a depositional sequence in Alaminos Canyon area of northwestern deep Gulf of Mexico. High resolution 3D seismic data was used to characterize the stratigraphic architecture evolution of deepwater deposits within 300 milliseconds interval below the sea floor. The seismic geomorphologic feature of deepwater channel was fast interpreted by combining seismic cross sections and stratal slices rendered by domain transformation. The surface wrapping interpretation results of the deepwater channel indicate that the near seafloor channel evolved from earlier wider and straight channel to later relatively narrow and sinuous channel within a depositional sequence. The channel exhibits vertical aggrading pattern in updip confined setting and changes to appear lateral migrating pattern in downdip unconfined setting through time. The spatial and temporal evolution of this deepwater channel in this study represents the typical evolution of the channel in base-of-slope deepwater setting and can be used as analog to predict and characterize the deepwater hydrocarbon reservoir at exploration depth in this area or other similar settings around the world.

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Computer enhanced GLORIA sidescan sonar images of the surface of the Mississippi Fan

Cited by 6 publications

References 8 publications

Sinuous deep-water channels: Genesis, geometry and architecture

Sinuous deep-water channels: Genesis, geometry and architecture

How Did Thin Submarine Debris Flows Carry Boulder-Sized Intraclasts for Remarkable Distances Across Low Gradients to the Far Reaches of the Mississippi Fan?

Seismic Geomorphology and Geometric Evolution of a Single Base-of-Slope Deepwater Channel in the near Seafloor of Alaminos Canyon, Northwestern Deep Gulf of Mexico

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