(Table T1) Stable oxygen and carbon isotopes of bulk carbonate from ODP Leg 207 sites

• Main Author: MacLeod, Kenneth G
• Format: Dataset
• Language: English
• Published: PANGAEA 2006
• Subjects: 207-1257A; 207-1258A; 207-1259A; 207-1260A; 207-1261A; 207-1261B; Depth; composite; sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Intercore correlation; Joides Resolution; Leg207; Mass spectrometer Finnigan Delta Plus; North Atlantic Ocean; Ocean Drilling Program; ODP; Sample code/label; Walvis Ridge; Southeast Atlantic Ocean; δ13C; carbonate; δ18O; North Atlantic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.775981; https://doi.org/10.1594/PANGAEA.775981

Stable isotopic values of 174 upper Campanian and Maastrichtian bulk carbonate samples from Demerara Rise, in the western tropical Atlantic (Ocean Drilling Program Leg 207, Sites 1257-1261), largely fall between 0 per mil and 2 per mil for d13C and between -2 per mil and -3 per mil for d18O. The relatively low values and high scatter of d13C values observed suggest secondary calcite with a remineralized organic carbon component was present in most to all samples analyzed. Oxygen isotopic data exhibit less scatter and values closer to those expected for contemporary sea-surface conditions than do carbon data. However, trends in d18O data at any one section do not correlate among sites using shipboard age estimates. Regardless of whether subsequent age estimates modify correlation among holes, diagenetic concerns will remain a significant complication in any efforts to study isotopic trends during the late Campanian-Maastrichtian at these sites.