On the Origin of Paleocurrent Complexity Within Deep Marine Channel Levees

2010 ◽  
Vol 80 (1) ◽  
pp. 54-66 ◽  
Author(s):  
I. A. Kane ◽  
W. D. McCaffrey ◽  
J. Peakall
Keyword(s):  
Channel Levees

Experiments on Wedge-Shaped Deep Sea Sedimentary Deposits in Minibasins and/or on Channel Levees Emplaced by Turbidity Currents. Part I. Documentation of the Flow

2009 ◽  
Vol 79 (8) ◽  
pp. 593-607 ◽  
Author(s):  
O. E. Sequeiros ◽  
B. Spinewine ◽  
M. H. Garcia ◽  
R. T. Beaubouef ◽  
T. Sun ◽  
...  
Keyword(s):  
Deep Sea ◽  
Turbidity Currents ◽  
Sedimentary Deposits ◽  
Channel Levees

Variability in form and growth of sediment waves on turbidite channel levees

2002 ◽  
Vol 192 (1-3) ◽  
pp. 23-58 ◽  
Author(s):  
William R. Normark ◽  
David J.W. Piper ◽  
Henry Posamentier ◽  
Carlos Pirmez ◽  
Sébastien Migeon
Keyword(s):  
Sediment Waves ◽  
Channel Levees

scholarly journals The Ogooue Fan (Gabon): a modern example of deep-sea system on a complex sea-floor topography

2018 ◽  
Author(s):  
Salomé Mignard ◽  
Thierry Mulder ◽  
Philippe Martinez ◽  
Thierry Garlan
Keyword(s):  
Sea Level ◽  
Deep Sea ◽  
Sedimentary Facies ◽  
Turbidity Currents ◽  
Acoustic Data ◽  
Fine Grained ◽  
Longshore Drift ◽  
Volcanic Islands ◽  
Sea Fan ◽  
Channel Levees

Abstract. The Ogooue deep-sea Fan located in the northeastern part of the Gulf of Guinea expands over more than 550 km westwards of the Gabonese shelf and passes through the Cameroun volcanic line. Here are presented the first study of acoustic data (multibeam echosounder and 3.5 kHz seismic data) and piston cores covering the deep-sea part of this West African system. This study led to the construction of the sedimentary processes map of this area. The overall system corresponds to a well-developed mud-sand rich deep-sea fan, fed by the Ogooue River 'sedimentary load. This system presents the typical morphological elements of clastic slope apron: tributary canyons, distributary channel-levees systems and lobes elements. However, variations on the slope gradient cumulated with the presence of numerous seamounts, including volcanic islands and mud volcanoes, led to a more complex fan architecture and sedimentary facies distribution. In particular, turbidity currents derived from the Gabonese shelf deposit across several interconnected sedimentary sub-basins located on the low gradient segments of the margin. The repeated spill-overs of the most energetic turbidite flows have notably led to the incision of a large distal valley connecting an intermediate sedimentary basin to the more distal lobe area. The sedimentary facies repartition over the fan indicates that pelagic to hemipelagic sedimentation is dominant across the area. Distribution and thickness of turbidite sand beds is highly variable along the system, however turbidite sands preferentially deposit in the bottom of channel-levee systems and on the most proximal depositional areas. The most distal depocenters receive only the upper parts of the flows, which are composed of fine-grained sediments. The Ogooue deep-sea system is predominantly active during periods of low sea-level because canyon heads are separated from terrestrial sediment sources by the broad shelf. However, the northern part of this system appears active during sea-level highstands. This feature is one deeply incised canyon, the Cape Lopez canyon, located on a narrower part of the continental shelf has a different behaviour and receives sediments transported by the longshore drift.

Evolution of Pliocene to Recent abyssal sediment waves on Bounty Channel levees, New Zealand

1990 ◽  
Vol 95 (2) ◽  
pp. 97-109 ◽  
Author(s):  
L. Carter ◽  
R.M. Carter ◽  
C.S. Nelson ◽  
C.S. Fulthorpe ◽  
H.L. Neil
Keyword(s):  
New Zealand ◽  
Sediment Waves ◽  
Channel Levees

scholarly journals MORFOLOGIA, PROCESSOS DE SEDIMENTAÇÃO E LITOFÁCIES DOS AMBIENTES MORFO-SEDIMENTARES DA PLANÍCIE COSTEIRA BRAGANTINA, NORDESTE DO PARÁ, BRASIL

1996 ◽  
Author(s):  
Pedro Walfir Martins Souza Filho ◽  
Maâmar El-Robrini
Keyword(s):  
Sea Level ◽  
Coastal Plain ◽  
Coastal Dunes ◽  
Flood Plain ◽  
Alluvial Plain ◽  
Marine Sand ◽  
Depositional System ◽  
Sand Sheet ◽  
Equatorial Climate ◽  
Channel Levees

The Bragança Coastal Plain is located in the Northeastern of Pará, in the Bragança-Viseu CoaxialBasin (Cretaceous), with an approximate surface area of 1,570 Km2. The geometry of the basin and itspaleotopography, associated with recent tectonic movements have controlled the distribution and thethickness of the tertiary and quaternary deposits. This coastal plain constitutes a macrotidal (6 m) depositionalsystem, developed in a hot and humid equatorial climate, with a dry and wet well defined seasons and anannual precipitation averaging 3,000 mm.The geomorphology of the area is subdivided into three main morphologic realms: (1) alluvial plain,with fluvial channel, levees and flood plain; (2) estuarine plain, with an estuarine channel subdivided intoestuarine funnel segment, straight segment, meandering segment and upstream channel, tidal creek and,floodplain and; (3) coastal plain, with salt marsh (inner and outer), tidal plain (supratidal mangroves,intertidal mangroves and sand flats with tidal shoals), chenier, coastal dunes and beach environments.The recent morpho-sedimentary units are separated from highland by a line of inactive cliffs that issituated 25 km from the coastline. This cliffs mark the higher Holocene sea level, very well knowed inbrazilian east coast as Holocenic Transgression (5,100 years B.P.). During this event was deposited a basaltransgressive sequence (S1), constituted by estuarine sand and mud and marine sand. Afterwards, underregressive or stillstand sea level the mangrove deposits prograde over the transgressive sand sheet buildinga prograding sequence (S2). Nowadays, this sequence are being overlain by a recent transgressive sequence(S3).The sedimentary model, based on lithostratigraphy and sedimentary processes, proposed to BragançaCoastal Plain show a complex coastal depositional system, constituted by different sedimentaryenvironments with singular sedimentary, stratigraphic and morphologic characteristics in relation to itsgeometry and spacial distribution of the environments.The morpho-sedimentary unit show that the environments studied from the alluvial plain to coastalplain represent a dynamic area dominated by macrotides and influenced by waves along the shoreline.Therefore, the depositional model proposed is composed by a coastal plain depositional system withfluvial-estuarine-tidal flat environments with dune-beach ridge associated.

A Polynomial Model for Lateral Thickness Decay of Submarine Channel-Levees

2014 ◽  
Vol 84 (1) ◽  
pp. 51-57 ◽  
Author(s):  
H. Ezz ◽  
A. Cantelli ◽  
J. Imran
Keyword(s):  
Polynomial Model ◽  
Submarine Channel ◽  
Channel Levees
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