seanoe:107979 Schmidt Sabine CNRS, UMR5805 EPOC 2025-10-27 ISO 19115:2003/19139 1.0 Depth profiles of 210Pb, 226Ra, 228Th, 137Cs and 40K in marine sediments of the West Gironde Mud Patch (Bay of Biscay) collected during the JERICObent7 cruise 2025-07-28 2025-10-27 Schmidt Sabine (2025). Depth profiles of 210Pb, 226Ra, 228Th, 137Cs and 40K in marine sediments of the West Gironde Mud Patch (Bay of Biscay) collected during the JERICObent7 cruise. SEANOE. https://doi.org/10.17882/107979 The West Gironde Mud Patch (WGMP) is a mud deposit located 25 km from the mouth of the Gironde Estuary in the Bay of Biscay. This 4-metre-thick clay-silt feature, which extends over an area of 420 km2, is found at depths between 30 and 80 meters. The main objectives of the JERICObent7 cruise, in July 2019, were to characterise the evolution of the WGMP’s benthic ecosystem in terms of its sedimentary, biogeochemical and ecological properties and to reconstruct climate variations and identify potential anthropogenic impacts over the last few centuries. To this end, a precise chronological framework was established for the sedimentary archives of the last few decades using 210Pbxs (T1/2 = 22.3 years). Interface cores were collected at stations 1, 3 and 4 along a cross-shelf transect. Twin Kullenberg cores were collected at sites 3 and 4 for geochemical (KGL) and palaeoceanographic (JB7-ST) investigations. Each interface core was carefully extruded at 0.5 cm intervals from the top of the core to 4 cm, and then at 1 cm intervals until the bottom was reached. Kullenberg cores were only collected at sites 3 and 4. Depending on their intended use, the Kullenberg cores were sampled at different resolutions, the depth of each sediment layer corresponded to the depth from the top of the core. These layers were then used to determine the dry bulk density and radioisotope activities of interest (210Pb, 226Ra,  228Th, 137Cs, 40K). Excess 210Pb was used to establish the realignment and chronological framework of the interface and Kullenberg cores. <p>This work was supported by the JERICO-NEXT (European Union's Horizon 2020 Research and Innovation program under grant agreement no. 654410) and LEFE- EC2CO VOG projects. The Regional Council of Nouvelle-Aquitaine (E3A project) is thanked for co-financing the Broad Energy gamma detector.</p> Schmidt Sabine CNRS, UMR5805 EPOC SEANOE https://www.seanoe.org/data/00968/107979/illustration.jpg Broad-Energy gamma spectrometer (BEGe™, Mirion Technology) at the EPOC laboratory West Gironde Mud Patch Bay of Biscay continental shelf sediment dry bulk density 210Pb 226Ra 228Th 137Cs 40K multicorer Kullenberg Marine geology Sedimentary fluxes ODATIS aggregation parameters and Essential Variable names 2025-07-29 geonetwork.thesaurus.external.theme.NVS.OD1 Marine geology SeaDataNet Parameter Disciplines 2025-07-29 geonetwork.thesaurus.external.parameter.NVS.P08 /Observational data/in-situ Type de jeux de donnée ODATIS 2024-10-15 geonetwork.thesaurus.local.theme.type_jeux_donnee CC-BY (Creative Commons - Attribution) History of the Sedimentary Regimes of the Aquitaine Margin (Bay of Biscay, France) at the Outlet of its Main Tributaries During the Last Millennium: A Mirror of the North Atlantic and European Climates 2025 Elsevier BV Eynaud Frédérique Schmidt Sabine Iratcabal Vincent Dubosq Nicolas Isabelle Billy Olivier Ther DEFLANDRE Bruno 10.2139/ssrn.5098379 History of the sedimentary regimes of the Aquitaine margin (Bay of Biscay, France) at the outlet of its main tributaries during the last millennium: a mirror of the North Atlantic and European climates 2025 Elsevier Eynaud Frédérique Schmidt Sabine Iratcabal Vincent Dubosq Nicolas Isabelle Billy Olivier Ther Deflandre Bruno 10.1016/j.gloplacha.2025.105039 10.17600/18001022 oceans -2.0 -1.5 45.4 45.8 2019-07-10 2019-07-15 CSV https://www.seanoe.org/data/00968/107979/data/121291.csv WWW:DOWNLOAD-1.0-link--download Quality controlled data Profiles of dry bulk density, 210Pb, 226Ra, 228TH, 137Cs and 40K in marine sediments - 11 KB https://doi.org/10.17882/107979 WWW:LINK-1.0-http--metadata-URL DOI of the product https://www.seanoe.org/data/00968/107979/ rel-canonical Seanoe 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. Radionuclide activities were measured in dry sediments using a high-efficiency, broad energy gamma detector equipped with a Cryo-Cycle II (Mirion Technology). The gamma detector is calibrated using IAEA certified materials (RGU-1). Errors on activities are based on standard deviation counting statistics