Stable carbon and oxygen isotope ratios of calcareous dinoflagellate cysts and planktic foraminifera from the Campanian/Maastrichtian section of ODP Hole 113-690C in the Weddell Sea (Table 1)

• Main Authors: Friedrich, Oliver, Meier, K J Sebastian
• Format: Dataset
• Language: English
• Published: PANGAEA 2003
• Subjects: 113-690C; Archaeoglobigerina australis; δ13C; δ18O; Archaeoglobigerina mateola; Counting 125-250 µm fraction; Counting 250-315 µm fraction; Counting 63-125 µm fraction; DEPTH; sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Globigerinelloides multispinatus; Hedbergella monmouthensis; Heterohelix dentata; Heterohelix globulosa; Isotope ratio mass spectrometry; Joides Resolution; Leg113; Mass spectrometer Finnigan MAT 251; Ocean Drilling Program; ODP; Orthopithonella globosa; Antarctic; Antarctic Ocean; Weddell; Weddell Sea; Antarc*
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.693934; https://doi.org/10.1594/PANGAEA.693934

Delta18O and delta13C values for the calcareous dinoflagellate species Orthopithonella? globosa (Fütterer 1984) Lentin and Williams 1985 and Pirumella krasheninnikovii (Bolli 1974) Lentin and Williams 1993 from lates Campanian and earliest Maastrichtian of ODP Hole 690C (Weddell Sea, Antarctic Ocean) have been studied in order to evaluate the species' depth habitat in the water column and their applicability in paleoceanographic studies. The calcareous dinoflagellates show isotopic values comparable to probably shallow-dwelling planktic foraminifera from the same sample in delta18O, but have an offset of about -5 ‰ to -7‰ in delta13C. This suggests that calcareous dinoflagellate oxygen isotopes may provide information for paleoceanographic reconstructions of sea-surface water temperatures, whereas their extremely light carbon isotope values are probably due to photosynthetic processes.