search DOI 10.17882/77523

Depth profiles of selected radionuclides and grain size in marine sediments of the West Gironde Mud Patch (Bay of Biscay)

The West Gironde Mud Patch (WGMP) is a 420-km2 mud belt in the Bay of Biscay, located 25 km off the mouth of the Gironde estuary. This clay-silt feature of 4 m in thickness extends between 30 and 75m water depth, surrounded by the sands and gravels that cover the North Aquitaine continental shelf. Interface cores were collected during JERICOBent-1 cruise (October 2016; Deflandre (2016) doi.org/10.17600/16010400) along two cross-shelf transects for a total of 9 sites. Each sediment core was carefully extruded every 0.5 cm from the top core to 4 cm and every 1 cm below until the core bottom. The sediment layers were used to determine dry bulk density, grain size and selected radioisotope activities (210Pb, 226Ra, 137Cs, 228Th, K).

Disciplines

Marine geology

Keywords

West Gironde Mud Patch, Bay of Biscay, continental shelf, 210Pb, 226Ra, 228Th, 137Cs, K, grain size, dry bulk density, sediment

Location

45.8N, 45.4S, -1.5E, -2W

Devices

Dry bulk density (DBD) determination: water content was determined by weighing each sediment samples before and after drying at 60°C, and dry bulk density was subsequently calculated, assuming a mineral density of 2.65 g/cm.

Sediment grain size was measured using a Malvern Mastersizer 2000 laser diffraction particle size analyzer.

Radionuclide activities were measured using a high-efficiency, broad energy gamma detector equipped with a Cryo-Cycle II (Mirion). The gamma detector is calibrated using IAEA certified materials (RGU-1). Errors on activities are based on standard deviation counting statistics

 

Data

FileSizeFormatProcessingAccess
Profiles of selected radionuclides, grain size and dry bulk density in marine sediment of the West Gironde Mud Patch (Bay of Biscay)
142 KoXLS, XLSXQuality controlled data
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How to cite
Schmidt Sabine (2020). Depth profiles of selected radionuclides and grain size in marine sediments of the West Gironde Mud Patch (Bay of Biscay). SEANOE. https://doi.org/10.17882/77523

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Oceanographic cruises
JERICOBENT-1
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Dubosq Nicolas, Schmidt Sabine, Walsh J.P., Grémare Antoine, Gillet Hervé, Lebleu Pascal, Poirier Dominique, Perello Marie-Claire, Lamarque Bastien, Deflandre Bruno (2021). A first assessment of organic carbon burial in the West Gironde Mud Patch (Bay of Biscay). Continental Shelf Research. 221. 104419 (11p.). https://doi.org/10.1016/j.csr.2021.104419, https://archimer.ifremer.fr/doc/00688/80054/
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