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Multi-process generated sediment waves on the Landes Plateau (Bay of Biscay, North Atlantic)

Multi-process generated sediment waves on the Landes Plateau (Bay of Biscay, North Atlantic)
Multi-process generated sediment waves on the Landes Plateau (Bay of Biscay, North Atlantic)
Detailed analyses of recently collected bathymetric and sparker seismic data, support a new interpretation of the Landes Plateau field of sediment waves located on the Aquitaine upper continental slope (Bay of Biscay). The wave geometry, previously described as the result of a major sediment failure, is interpreted as a structure with a complex origin including the interaction of depositional and gravity deformation processes. Depositional processes are mainly recorded by the upslope migrating pattern of the waves resulting from oblique or sigmoid downlap reflections on the upslope flank of the waves and by toplapping and truncated reflections on the downslope flank. Hemipelagic and turbiditic sedimentation may be involved in the wave building as well as contouritic processes that could be related to the existing northward polar current and internal waves. Gravity deformations are syndepositional, discontinuous and of low amplitude, affecting thick layers which alternate with undeformed layers. They seem to correspond to gentle sediment creeping or stretching associated with minor listric or compaction-like faults, and possible limited back rotation of sediment blocks. These multi-process generated sediment waves could be rather common on the continental margins as they could have been mistaken with either depositional or deformational structures.
continental slope, Bay of Biscay, Landes Plateau, sediment wave, process interaction, sediment deformation, contour current, seismic data
9781402065118
0025-3227
279-302
Faugeres, J-C.
46f80dcd-61da-4a2b-a7bb-54fd55286e70
Gonthier, E.
513c897a-bce9-4532-a8e7-bc664614ede7
Mulder, T.
d7427cfd-88d1-48c3-89d8-d286a399ecac
Kenyon, N.H.
c9e9b414-ac6c-4264-8e63-7bf99196a869
Cirac, P.
666e829a-3015-42b3-832a-3d6569482943
Bellec, V.
361aee99-5b7b-4666-8e82-c200b884a404
Griboulard, R.
05c0dbb6-dd97-40d9-a68e-21d1b715c47d
Berne, S.
e03ffd6b-50e9-4c20-a710-435212c69571
Lesuave, R.
13d631a2-bf94-4c1a-86e0-ec5e9fd8d224
Faugeres, J-C.
46f80dcd-61da-4a2b-a7bb-54fd55286e70
Gonthier, E.
513c897a-bce9-4532-a8e7-bc664614ede7
Mulder, T.
d7427cfd-88d1-48c3-89d8-d286a399ecac
Kenyon, N.H.
c9e9b414-ac6c-4264-8e63-7bf99196a869
Cirac, P.
666e829a-3015-42b3-832a-3d6569482943
Bellec, V.
361aee99-5b7b-4666-8e82-c200b884a404
Griboulard, R.
05c0dbb6-dd97-40d9-a68e-21d1b715c47d
Berne, S.
e03ffd6b-50e9-4c20-a710-435212c69571
Lesuave, R.
13d631a2-bf94-4c1a-86e0-ec5e9fd8d224

Faugeres, J-C., Gonthier, E., Mulder, T., Kenyon, N.H., Cirac, P., Bellec, V., Griboulard, R., Berne, S. and Lesuave, R. (1970) Multi-process generated sediment waves on the Landes Plateau (Bay of Biscay, North Atlantic). Marine Geology, 182 (3-4), 279-302. (doi:10.1016/S0025-3227(01)00242-0).

Record type: Article

Abstract

Detailed analyses of recently collected bathymetric and sparker seismic data, support a new interpretation of the Landes Plateau field of sediment waves located on the Aquitaine upper continental slope (Bay of Biscay). The wave geometry, previously described as the result of a major sediment failure, is interpreted as a structure with a complex origin including the interaction of depositional and gravity deformation processes. Depositional processes are mainly recorded by the upslope migrating pattern of the waves resulting from oblique or sigmoid downlap reflections on the upslope flank of the waves and by toplapping and truncated reflections on the downslope flank. Hemipelagic and turbiditic sedimentation may be involved in the wave building as well as contouritic processes that could be related to the existing northward polar current and internal waves. Gravity deformations are syndepositional, discontinuous and of low amplitude, affecting thick layers which alternate with undeformed layers. They seem to correspond to gentle sediment creeping or stretching associated with minor listric or compaction-like faults, and possible limited back rotation of sediment blocks. These multi-process generated sediment waves could be rather common on the continental margins as they could have been mistaken with either depositional or deformational structures.

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More information

Published date: 1 January 1970
Keywords: continental slope, Bay of Biscay, Landes Plateau, sediment wave, process interaction, sediment deformation, contour current, seismic data

Identifiers

Local EPrints ID: 58439
URI: http://eprints.soton.ac.uk/id/eprint/58439
ISBN: 9781402065118
ISSN: 0025-3227
PURE UUID: 2c63cdfd-49ad-4b6d-845f-b0d7b7bcc306

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Date deposited: 13 Aug 2008
Last modified: 13 Mar 2019 20:32

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Contributors

Author: J-C. Faugeres
Author: E. Gonthier
Author: T. Mulder
Author: N.H. Kenyon
Author: P. Cirac
Author: V. Bellec
Author: R. Griboulard
Author: S. Berne
Author: R. Lesuave

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