Pleistocene benthic stable isotopes and and age-depth model from the Agulhas Plateau Composite (APcomp)

Stable isotope measurements were performed on 2-3 Cibicidoides wuellerstorfi specimens (250-315μm size fraction) and made on a Thermo Finnigan MAT 253 mass spectrometer linked online to a Carbo Kiel carbonate preparation device at Cardiff University with long-term precision of ±0.05‰ for δ18O and ±0.021‰ for δ13C (±1σ).

Results are calibrated to an internal laboratory standard (BCT63) and presented relative to the Vienna Pee Dee Belemnite scale. IRD is defined as detrital mineral grains (excluding volcanic ash) >150μm. IRD is normalized to sample weight (IRD concentration in #/g) and then multiplication by apparent bulk mass accumulation rate derived from estimates of dry bulk density and linear sedimentation rate.