Data/hora: 04/06/2024 00:33:55

Provedor de dados: | 5
País: | France
Título: | Pockmarks on the South Aquitaine Margin continental slope: The seabed expression of past fluid circulation and former bottom currents
Autores: | Michel, Guillaume; Dupre, Stephanie; Baltzer, Agnes; Ehrhold, Axel; Imbert, Patrice; Pitel, Mathilde; Loubrieu, Benoit; Scalabrin, Carla; Lazure, Pascal; Marie, Louis; Geldof, Jean-baptiste; Deville, Eric.
Data: | 2017-12
Ano: | 2017
Palavras-chave: | Pockmark; Fluid; Seabed morphology; Aquitaine slope; GIS; Currents.
Resumo: | Inactive and mostly elongated pockmarks of 100–200 m in dimension were recently discovered on the South Aquitaine Margin continental slope. They are distributed at water depths greater than 350 m in both interfluve and sediment-wave areas, and are strongly controlled by the sedimentary morphology and architecture. Water column and seafloor backscatter and sub-bottom profiler data do not exhibit present-day or past gas evidence, e.g., massive and continuous gas releases at the seabed and fossil methane-derived authigenic carbonates. It is thus proposed that the pockmarks originated from a shallow source and result from relatively recent and short-duration gas or water expulsion events. Former near-bottom currents may have contributed to the elongation of these WNW–ESE-oriented pockmarks, whereas present-day weaker near-bottom currents may induce upwelling, contributing to the maintenance of the elongated shapes of the pockmarks.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/00413/52491/53279.pdf

http://archimer.ifremer.fr/doc/00413/52491/53280.pdf

http://archimer.ifremer.fr/doc/00413/52491/53282.jpg

http://archimer.ifremer.fr/doc/00413/52491/53283.jpg

DOI:10.1016/j.crte.2017.10.003

http://archimer.ifremer.fr/doc/00413/52491/

Editor: | Elsevier France-editions Scientifiques Medicales Elsevier
Relação: | info:eu-repo/grantAgreement/EC/FP7/213144/EU//CORALFISH
Formato: | application/pdf
Fonte: | Comptes Rendus Geoscience (1631-0713) (Elsevier France-editions Scientifiques Medicales Elsevier), 2017-12 , Vol. 349 , N. 8 , P. 391-401

Fonte:

2017 Academie des sciences. Published by Elsevier Masson SAS. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/ 4.0/).

info:eu-repo/semantics/openAccess

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