Sediment depth age-models, stable carbon isotope data, and radiocarbon data of Atlantic Ocean sediment cores

• Main Authors: Skinner, Luke C, Freeman, Emma, Hodell, David A, Waelbroeck, Claire, Vázquez Riveiros, Natalia, Scrivner, Adam E
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2020
• Subjects: Atlantic; radiocarbon; reservoir age; stable carbon isotopes; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.925638; https://doi.pangaea.de/10.1594/PANGAEA.925638

Sediment depth age-models, stable carbon isotope data, and radiocarbon data are reported for a suite of sediment cores from Iberian- and Brazil Margins, in the Atlantic basin. The sediment sequences span the last deglaciation (~30,000 years to the present). Stable carbon isotopes were measured on the benthic foraminifer species Cibicidoides wuellerstorfi, in the Godwin Laboratory, University of Cambridge. Each measurement was run on 1-4 individuals with a combined mass of 50-180μg. Samples were reacted with orthophosphoric acid (100%) and analysed, in comparison with a reference gas, using a dual inlet Thermo MAT 253 mass spectrometer connected to a Kiel device. Radiocarbon dates were obtained on monospecific samples of planktonic foraminifera, Globigerinoides ruber (Brazil Margin) or Globigerina bulloides (Iberian Margin), and samples of mixed benthic foraminifera (excluding agglutinated species) picked from the >150μm size-fraction. Samples were graphitized in the Godwin Radiocarbon Laboratory at the University of Cambridge, using a standard hydrogen/iron catalyst reduction method. AMS-14C dates were subsequently measured at the 14Chrono Centre, Queens University Belfast. All dates are reported as 'conventional radiocarbon ages', without additional 'corrections' applied. Reservoir ages and radiocarbon ventilation ages are derived based on the sediment core chronologies, and reported as offsets between contemporary marine- and atmospheric radiocarbon ages (based on the 'Intcal13' atmospheric radiocarbon calibration curve).