| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Pockmarks on the South Aquitaine Margin continental slope: The seabed expression of past fluid circulation and former bottom currents
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| 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
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| Data: |
2017-12
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| Ano: |
2017
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| Palavras-chave: |
Pockmark
Fluid
Seabed morphology
Aquitaine slope
GIS
Currents
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| 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.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| 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/
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| Editor: |
Elsevier France-editions Scientifiques Medicales Elsevier
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| Relação: |
info:eu-repo/grantAgreement/EC/FP7/213144/EU//CORALFISH
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| Formato: |
application/pdf
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| Fonte: |
Comptes Rendus Geoscience (1631-0713) (Elsevier France-editions Scientifiques Medicales Elsevier), 2017-12 , Vol. 349 , N. 8 , P. 391-401
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| Direitos: |
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
restricted use
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