Spatial distribution of (sub-)outcropping methane-derived authigenic carbonate structures at the outer Aquitaine Shelf

The present database is composed of a polygon shape file (.shp) dedicated to GIS applications. This seafloor surface represents the area within which (sub-)outcropping methane derived authigenic carbonates were identified based on ship-borne multibeam bathymetry and seafloor backscatter data; as displayed in Figs. 4 and S1a of Dupré et al. 2020 (Dupré S, Loubrieu B, Pierre C, Scalabrin C, Guérin C, Ehrhold A, Ogor A, Gautier E, Ruffine L, Biville R, Saout J, Breton C, Floodpage J, Lescanne M (2020) The Aquitaine Shelf Edge (Bay of Biscay): A Primary Outlet for Microbial Methane Release. Geophysical Research Letters 47 (7):e2019GL084561. doi:10.1029/2019gl084561). The presence of (sub-)outcropping methane-derived authigenic carbonates at the seafloor was confirmed by remotely-operated-vehicle dives during the GAZCOGNE2 marine expedition.

The acoustic data were acquired in 2013 on board the R/V Le Suroît during the GAZCOGNE1 expedition with two ship-borne multibeam echosounders, the Kongsberg EM302 and EM2040, with transmission frequency of 30 and 200 kHz, respectively. Details on multibeam data acquisition, processing and interpretation of sub-outcropping methane-derived authigenic carbonate structures are presented in Dupré et al 2020 (including a Supporting Information section).

Cited from Dupré et al 2020: “The carbonates are exclusively located along the shelf edge with the majority (98%) between 140 and 220 m water depths. The (sub-)outcropping carbonates are spread over a 375 km2 area that extends over a distance of 80 km between the Cap Ferret and Capbreton canyons. The western spatial limit of the methane-derived authigenic carbonates coincides with the shelf break.”

 
Citation proposal
DUPRÉ Stéphanie (Ifremer, Geo-Ocean UMR, France, Plouzané) (2024) . Spatial distribution of (sub-)outcropping methane-derived authigenic carbonate structures at the outer Aquitaine Shelf. https://services.mspdata.eu:/geonetwork/srv/api/records/seanoe:98661

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Date ( Publication )
2024-01
Date ( Revision )
2024-02-06
Other citation details
Dupré Stéphanie (2024). Spatial distribution of (sub-)outcropping methane-derived authigenic carbonate structures at the outer Aquitaine Shelf. SEANOE. https://doi.org/10.17882/98661
Credit
The marine expedition GAZCOGNE1 (https://doi.org/10.17600/13020070) and GAZCOGNE2 (https://doi.org/10.17600/13030090) were co-funded by TotalEnergies and IFREMER as part of the PAMELA (Passive Margin Exploration Laboratories) scientific project (http://dx.doi.org/10.18142/236).

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Keywords ( Theme )
  • Marine geology
SeaDataNet Parameter Disciplines ( parameter )
  • Marine geology
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Date ( Publication )
2020

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Cross reference
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Study
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Cross reference
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Platform
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Cross reference
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Metadata language
English
Topic category
  • Oceans
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  • SHP ( )

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Processed data  

Data - 261 KB

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Seanoe  
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seanoe:98661   XML
Metadata language
English
Character set
UTF8
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Date stamp
2024-02-06
Metadata standard name
ISO 19115:2003/19139
Metadata standard version
1.0

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Spatial distribution of (sub-)outcropping methane-derived authigenic carbonate structures at the outer Aquitaine Shelf. Background bathymetry from Emodnet, version 2020 (https://www.emodnet-bathymetry.eu/)

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