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Journal articles
Pockmarks on the South Aquitaine Margin continental slope: the seabed expression of past fluid circulation and bottom currents
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.
Cited literature [53 references]
https://hal-ifp.archives-ouvertes.fr/hal-01704712
Contributor : Nadine Couëdel <>
Submitted on : Tuesday, September 15, 2020 - 10:02:53 AM
Last modification on : Thursday, July 29, 2021 - 10:06:08 AM
Contributor : Nadine Couëdel <>
Submitted on : Tuesday, September 15, 2020 - 10:02:53 AM
Last modification on : Thursday, July 29, 2021 - 10:06:08 AM
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2017_CRG_Michelal.pdf
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