We combine consistently dated benthic carbon isotopic records distributed over the entire Atlantic Ocean with numerical simulations performed by a glacial configuration of the Norwegian Earth System Model with active ocean biogeochemistry, in order to interpret the observed Cibicides d13C changes at the stadial-interstadial transition corresponding to the end of Heinrich Stadial 4 (HS4) in terms of ocean circulation and remineralization changes. We show that the marked increase in Cibicides d13C observed at the end of HS4 between ~2000 and 4200 m in the Atlantic can be explained by changes in nutrient concentrations as simulated by the model in response to the halting of freshwater input in the high latitude glacial North Atlantic. Our model results show that this Cibicides d13C signal is associated with changes in the ratio of southern-sourced (SSW) versus northern-sourced (NSW) water masses at the core sites, whereby SSW is replaced by NSW as a consequence of the resumption of deep water formation in the northern North Atlantic and Nordic Seas after the freshwater input is halted. Our results further suggest that the contribution of ocean circulation changes to this signal increases from ~40% at 2000 m to ~80% at 4000 m. Below ~4200 m, the model shows little ocean circulation change but an increase in remineralization across the transition marking the end of HS4. The simulated lower remineralization during stadials than interstadials is particularly pronounced in deep subantarctic sites, in agreement with the decrease in the export production of carbon to the deep Southern Ocean during stadials found in previous studies. Important Note: This submission has been initially submitted to SEA scieNtific Open data Edition (SEANOE) publication service and received the recorded DOI. The metadata elements have been further processed (refined) in EMODnet Ingestion Service in order to conform with the Data Submission Service specifications.

This dataset contains the data acquired on the 20 m-long core CAS16-04PC (16°42.380’N, 60°36.907’W, 5706 mbsl) sampled with the Calypso piston coring system in the Désirade Basin offshore the Guadeloupe island (Lesser Antilles) during the research cruise (CASEIS)-[https://doi.org/10.17600/16001800] (DOI 10.17600/16001800) on board of the R/V Pourquoi Pas?,  between May 28th to July 05th 2016. The core was divided in twelve 150 cm-thick sections and one 110 cm-thick section. This dataset consists of the raw data measured: 1) on board with the GEOTECK Multi Sensor Core Logger of the Quebec University at Rimouski (on the whole core: P-wave velocity, gamma density, and volumetric magnetic susceptibility; and on the split core:  high resolution photographs, surface magnetic susceptibility and spectrophotocolorimetry); and 2) the X-ray images with the SCOPIX system and the semi-quantitative chemical elementary profiles with an AVAATECH XRF core scanner at UMR EPOC Bordeaux. 35 turbidites has been identified, including 3 thick deposits interpreted as homogenite/turbidite (up to 4 m-thick), intercalated with hemipelagic sediment layers. Important Note: This submission has been initially submitted to SEA scieNtific Open data Edition (SEANOE) publication service and received the recorded DOI. The metadata elements have been further processed (refined) in EMODnet Ingestion Service in order to conform with the Data Submission Service specifications.

This dataset contains the data acquired on the 20 m-long core CAS16-06PC (16°55.836’N, 60°37.135’W, 5585 mbsl) sampled with the Calypso piston coring system in the Caravelle Half Graben offshore the Guadeloupe island (Lesser Antilles) during the research cruise (CASEIS)-[https://doi.org/10.17600/16001800] (DOI 10.17600/16001800) on board of the R/V Pourquoi Pas?,  between May 28th to July 05th 2016. The core was divided in thirteen 150 cm-thick sections. This dataset consists of the raw data measured: 1) on board with the GEOTECK Multi Sensor Core Logger of the Quebec University at Rimouski (on the whole core: P-wave velocity, gamma density, and volumetric magnetic susceptibility; and on the split core:  high resolution photographs, surface magnetic susceptibility and spectrophotocolorimetry); and 2) the X-ray images with the SCOPIX system and the semi-quantitative chemical elementary profiles with an AVAATECH XRF core scanner at UMR EPOC Bordeaux. 39 turbidites has been identified, including 3 thick deposits interpreted as homogenite/turbidite (up to 3 m-thick), intercalated with hemipelagic sediment layers.  Important Note: This submission has been initially submitted to SEA scieNtific Open data Edition (SEANOE) publication service and received the recorded DOI. The metadata elements have been further processed (refined) in EMODnet Ingestion Service in order to conform with the Data Submission Service specifications.

This dataset contains the data acquired on the 19 m-long core CAS16-07PC (17°18.481’N, 60°59.840’W, 5425 mbsl) sampled with the Calypso piston coring system in the Méduse Basin offshore the Antigua island (Lesser Antilles) during the research cruise (CASEIS)-[https://doi.org/10.17600/16001800] (DOI 10.17600/16001800) on board of the R/V Pourquoi Pas?, between May 28th to July 05th 2016. The core was divided in 12 sections of about 150 cm and 1 section of about 100 cm. This dataset consists of the raw data measured: 1) on board with the GEOTECK Multi Sensor Core Logger of the Quebec University at Rimouski (on the whole core: P-wave velocity, gamma density, and volumetric magnetic susceptibility; and on the split core:  high resolution photographs, surface magnetic susceptibility and spectrophotocolorimetry); and 2) the X-ray images with the GEOTEK X-ray CT and the semi-quantitative chemical elementary profiles with an AVAATECH XRF core scanner at IFREMER. 81 turbidites has been identified intercalated with hemipelagic sediment layers.  Important Note: This submission has been initially submitted to SEA scieNtific Open data Edition (SEANOE) publication service and received the recorded DOI. The metadata elements have been further processed (refined) in EMODnet Ingestion Service in order to conform with the Data Submission Service specifications.

This dataset contains the data acquired on the sedimentary cores collected with the Calypso piston coring system at the same location (17°05.212’N, 60°50.248’W, 5821 mbsl) in the Falmouth Half Graben offshore the Guadeloupe island (Lesser Antilles) during the research cruise (CASEIS)-[https://doi.org/10.17600/16001800] (DOI 10.17600/16001800) on board of the R/V Pourquoi Pas?,  between May 28th to July 05th 2016. Two cores were sampled in this basin the CAS16-03PC and CAS16-14PC cores, which are 9.50 and 26.50 m-long, respectively. This dataset consists of the photo took on the core CAS16-03PC and the raw data measured on the longest core, the core CAS16-14PC: 1) on board with the GEOTECK Multi Sensor Core Logger of the Quebec University at Rimouski (on the whole core: P-wave velocity, gamma density, and volumetric magnetic susceptibility; and on the split core:  high resolution photographs, surface magnetic susceptibility and spectrophotocolorimetry); and 2) the X-ray images with the GEOTEK X-ray CT and the semi-quantitative chemical elementary profiles with an AVAATECH XRF core scanner at IFREMER. The stratigraphy of both cores appears identical. The core CAS16-14PC records 29 turbidites, including 4 thicker sedimentary event (up to 5 m-thick), intercalated with hemipelagic sediment layers. Important Note: This submission has been initially submitted to SEA scieNtific Open data Edition (SEANOE) publication service and received the recorded DOI. The metadata elements have been further processed (refined) in EMODnet Ingestion Service in order to conform with the Data Submission Service specifications.

The dataset contains the measurements of concentration of metals in sediments

The ReZoEnv field campaign was conducted at 9 sites distributed within contrasted seagrass (Zostera notlei) meadows in the Arcachon Bay. This multi-parameter survey was conducted during one year (November 2015 – November 2016). Water levels, temperature and light were recorded every 10 minutes. While bed sediment characteristics (granulometry, water content, organic matter content), seagrass characteristics (coverage, biometry, chlorophyll and CNP content) were measured monthly. Additionally, wind-wave parameters were obtained from high frequency pressure sensor at 4 sites, every 20 minutes. List of sites : ANDE : 44.745091 N, 1.121366 O FONT : 44.722631 N, 1.080133 O GAIL : 44.662573 N, 1.099575 O GARR : 44.705132 N, 1.121562 O HAUT : 44.729331 N, 1.15608 O ILE : 44.683117 N, 1.162716 O JACQ : 44.724563 N, 1.181109 O PASS : 44.689927 N, 1.089491 O ROCH : 44.648529 N, 1.127736 O Important Note: This submission has been initially submitted to SEA scieNtific Open data Edition (SEANOE) publication service and received the recorded DOI. The metadata elements have been further processed (refined) in EMODnet Ingestion Service in order to conform with the Data Submission Service specifications.

The SW Pacific region contains several ridges and basins that are inferred to represent pre-Quaternary volcanic arcs and back-arc basins. The geology of these features is less well characterized than that of the active Tonga-Kermadec and Vanuatu arcs. We report new major and trace element, and Pb, Hf, Sr and Nd isotope data for 27 lavas dredged from the Loyalty and Three Kings ridges during the 2015 VESPA cruise of R/V l'Atalante. Low-K basalts were dredged from the seabed deeper than 3300 m, and high-K to shoshonitic suites from shallower ridge crests at 2000–3300 m. The samples are mainly basalts, with lesser trachybasalts, basaltic andesites, trachyandesites andesites, dacites, and one granite (anhydrous SiO2 and K2O + Na2O range from ~47 to 64 and 1.5 to 11 wt% respectively). Trace element patterns allow discrimination of three geochemical signatures, identified as i) depleted, ii) transitional and iii) enriched, based on their light to heavy rare earth element (REE) ratios (with La/Sm ranging from 0.4 to 8). Depleted and transitional samples are basalts, featuring REE concentrations similar to MORB, but with high field strength element and large ion lithophile element contents, typical of back-arc basin basalts. The most enriched samples are basaltic andesites, andesites, trachyandesites and trachytes with island arc magma trace element signatures. Pb isotope ranges are limited (208Pb/204Pb ~38 to 39.8, 207Pb/204Pb ~15.51 to 15.64 and 206Pb/~17.9 to 20.1), while Hf isotopes display more diverse compositions (eHf ranging from +7.7 to +14). Both Nd (eNd = 2.8–9.3) and Sr (87Sr/86Sr = 0.7026–0.7048) isotopes are correlated with Hf data. Trace element and isotopic compositions can be explained in terms of mixing between three distinct geochemical endmembers in the mantle resembling DMM, HIMU and EM-2 sources. Our study confirms voluminous subduction-related magmatism on the Loyalty and Three Kings ridges, mostly of Late Oligocene – Early Miocene age. The issue of polarity of subduction to generate these rocks remains open, but the composition-space-time distribution of the igneous rocks can be explained in the context of SW Pacific geodynamics using a west-dipping Pacific slab model. Important Note: This submission has been initially submitted to SEA scieNtific Open data Edition (SEANOE) publication service and received the recorded DOI. The metadata elements have been further processed (refined) in EMODnet Ingestion Service in order to conform with the Data Submission Service specifications.