Stable isotope data and calcification temperature from planktic foraminifera in sediment core BOFS31/1K ...

• Main Authors: Elderfield, Henry, Ganssen, Gerald M
• Format: Dataset
• Language: English
• Published: PANGAEA 2000
• Subjects: DEPTH, sediment/rock; AGE; Globorotalia inflata, δ18O; Globigerinoides ruber pink, δ18O; Neogloboquadrina pachyderma dextral, δ18O; Globorotalia menardii, δ18O; Calcification temperature; Δδ18O; Kasten corer; Isotope ratio mass spectrometry; CD53; Charles Darwin; Neogloboquadrina pachyderma; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.143845; https://doi.pangaea.de/10.1594/PANGAEA.143845

Determining the past record of temperature and salinity of ocean surface waters is essential for understanding past changes in climate, such as those which occur across glacial-interglacial transitions. As a useful proxy, the oxygen isotope composition (delta18O) of calcite from planktonic foraminifera has been shown to reflect both surface temperature and seawater delta18O, itself an indicator of global ice volume and salinity (Shackleton, 1974; Rostek et al., 1993, doi:10.1038/364319a0). In addition, magnesium/calcium (Mg/Ca) ratios in foraminiferal calcite show a temperature dependence (Nürnberg, 1995, doi:10.2113/gsjfr.25.4.350; Nürnberg et al., 1996, doi:10.1016/0016-7037(95)00446-7; Lea et al., 1999, doi:10.1016/S0016-7037(99)00197-0) due to the partitioning of Mg during calcification. Here we demonstrate, in a field-based calibration experiment, that the variation of Mg/Ca ratios with temperature is similar for eight species of planktonic foraminifera (when accounting for Mg dissolution effects). ... : Calcification temperature derived from Mg/Ca ratios using the calibartion equation Mg/Ca(mmol/mol)=0.52exp0.1T (in deg C). Ages are in calendar years. ...