| Registro completo |
| Provedor de dados: |
ArchiMer
|
| País: |
France
|
| Título: |
Origin of an enigmatic regional Mio-Pliocene unconformity on the Demerara plateau
|
| Autores: |
Pattier, France
Loncke, L.
Imbert, Patrice
Gaullier, V.
Basile, C.
Maillard, Alexandre
Roest, Walter
Patriat, Martin
Vendeville, B. C.
Marsset, Tania
Bayon, Germain
Cathalot, Cecile
Caprais, Jean-claude
Bermell, Sylvain
Sotin, Christine
Hebert, Bertil
Mercier De Lepinay, Marion
Lebrun, J. F.
Marcaillou, B.
Heuret, A.
Droz, Laurence
Graindorge, David
Poetisi, E.
Berrenstein, H.
|
| Data: |
2015-07
|
| Ano: |
2015
|
| Palavras-chave: |
Unconformity
Hydrate pockmark
Slide
Contourite
Valley
Canyon
Demerara plateau
|
| Resumo: |
The Demerara plateau, located offshore French Guiana and Suriname, is part of a passive transform continental margin particularly prone to develop slope instabilities, probably in relation to the presence of a free distal border along its steep continental slope. Slope failure occurred at different periods (Cretaceous to Neogene) and shows an overall retrogressive evolution through time. Upslope these failure headscarp, an enigmatic regional MioPliocene unconformity has been discovered through the interpretation of new academic and industrial datasets. The aim of this work is to describe and understand the origin of this surface. Our analysis shows that this unconformity is made of a series of valleys that cross-cut sedimentary strata. Each one of these valleys has a short lateral extent and is closed along two perpendicular directions, which suggests that it could correspond to a highly meandering system, or to some sub-circular depressions. The infill of these features is equivalent to the regional stratigraphic strata found outside the structures, but in a subdued position. This seems to imply that the structures have originated by a local loss of sediments at their base or by sliding processes. Furthermore, these depressions intersect each other through time, while migrating progressively downslope. We discuss a series of hypotheses that try to explain the onset and evolution of these depressions forming the Mio-Pliocene unconformity (Canyons? Slope failures? Contourite moats? Hydrate pockmarks?). Having established that these structures are depressions formed by collapse, and have many similarities with structures recently described in the literature as pockmarks associated with gas hydrate dissolution, we favor this hypothesis. We propose that these hydrate pockmarks form with a mass failure that was triggered by fluid-overpressure development at the base of the hydrate stability zone.
|
| Tipo: |
Text
|
| Idioma: |
Inglês
|
| Identificador: |
https://archimer.ifremer.fr/doc/00271/38193/36735.pdf
DOI:10.1016/j.margeo.2015.04.001
https://archimer.ifremer.fr/doc/00271/38193/
|
| Editor: |
Elsevier Science Bv
|
| Formato: |
application/pdf
|
| Fonte: |
Marine Geology (0025-3227) (Elsevier Science Bv), 2015-07 , Vol. 365 , P. 21-35
|
| Direitos: |
2015 Elsevier B.V. All rights reserved.
info:eu-repo/semantics/openAccess
restricted use
|
|
