Middle Miocene seawater isotope evolution at IODP Site 307-U1318

• Main Authors: Hättig, Katrin, Varma, Devika, Louwye, Stephen, Schouten, Stefan, van der Meer, Marcel T J
• Format: Dataset
• Language: English
• Published: PANGAEA
• Subjects: 307-U1318B; 307-U1318C; According to Sangiorgi (2021); Age; Alkenone C37:2; δD; standard deviation; Calculated according to Cramer et al. (2011); Calculated according to Gould et al. (2019); Calculated according to Willemijn et al. (2018); Calculated from TEX86L (Kim et al.; 2012); Depth; composite; sediment/rock; DRILL; Drilling/drill rig; Event label; Exp307; Foraminifera; benthic δ18O; Hydrogen isotopes; Isotope Ratio Mass Spectrometer (IRMS); Thermo Fisher Scientific; Delta V; Joides Resolution; oxygen isotopes; Porcupine Basin Carbonate Mounds; Replicates; Sample code/label; Sea surface temperature; Temperature; δ18O; water; δ Deuterium; Cramer; North East Atlantic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.967156

Mid-Miocene (16.6 – 12.8 Ma) hydrogen isotopes of alkenones and sea temperatures are obtained from the sediment record of Integrated Ocean Discovery Program (IODP) Expedition 307, Site U1318 drilled in the Porcupine Basin, north east Atlantic at a water depth of ~ 400 m. Surface seawater isotopes are calculated based on the hydrogen isotopic compositions of C37 long chain alkenones (δ2HC37) with the environment calibration of Gould et al. (2019, doi:10.1016/j.gca.2018.12.004). The bottom seawater isotopes are based on oxygen isotopes of benthic foraminifera (record from Quaijtaal et al., 2018, doi:10.1017/S0016756816001278) and subsurface temperature (subT) estimates (TEX86H). We applied the calibration of Cramer et al. (2011, doi:10.1029/2011JC007255) and calculated subT with the 0-200 m equation of Kim et al. (2012, doi:10.1029/2012GL051157).