@misc{52491, type = "Article", year = "2017", title = "Pockmarks on the South Aquitaine Margin continental slope: The seabed expression of past fluid circulation and former bottom currents", journal = "Comptes Rendus Geoscience", editor = "Elsevier France-editions Scientifiques Medicales Elsevier", volume = "349", number = "8", pages = "391-401", author = "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", url = "https://archimer.ifremer.fr/doc/00413/52491/", organization = "", address = "FRANCE", doi = "https://doi.org/10.1016/j.crte.2017.10.003", abstract = "
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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