δ18O measurements of benthic foraminifera from sediment core MD13-3473

Stable O isotopic ratios were analysed in core MD13-3473, collected from the Tore seamount on the Iberian margin, for δ18O. Bulk subsamples of approximately 30 grams each were wet-weighed, freeze-dried, and reweighed, then ultrasonicated in a water bath, washed, and sieved with tap and distilled water into two grain-size fractions (63-150 μm and >150 μm) at the Sedimentology and Micropaleontology Laboratory of IGME-CSIC, Spain. These fractions were dried on paper filters in an oven at 40 ºC and weighed. Then, foraminifera species – approx. 30 individuals of planktonic foraminifera (Globigerina bulloides, Globorotalia inflata, and Orbulina universa), and approx. 10 individuals of benthic foraminifera (Cibicides wuellerstorfi and Cibicides lobatulus) – were picked from the >150 μm fraction in core MD13-3473.