Stable oxygen isotope ratios of foraminifera from late middle Eocene sediments of ODP Site 171-1052 from Blake Plateau, West Atlantic Ocean (Appendix)

• Main Authors: Wade, Bridget S, Kroon, Dick
• Format: Dataset
• Language: English
• Published: PANGAEA 2002
• Subjects: 171-1052; Acarinina praetopilensis; δ18O; Blake Nose; North Atlantic Ocean; Chiloguembelina cubensis; Comment; COMPCORE; Composite Core; Counting 250-355 µm fraction; Depth; composite; sediment/rock; DSDP/ODP/IODP sample designation; Foraminifera; benthic; benthic δ18O; Globigerinatheka mexicana; Hantkenina alabamensis; Joides Resolution; Leg171B; Mass spectrometer VG Isogas Prism; Morozovella crassata; Morozovella spinulosa; Morozovella spp.; Nuttallides truempyi; Ocean Drilling Program; ODP; Sample code/label; Subbotina utilisindex; Turborotalia cocoaensis; North Atlantic; Planktonic foraminifera
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.678251; https://doi.org/10.1594/PANGAEA.678251

High-resolution (~3 k.y.) delta18O records from middle Eocene mixed-layer dwelling planktonic foraminifera from the western North Atlantic show pronounced (>1‰) variability. The magnitude of change is greater than that seen in open-ocean Pleistocene records, but could not have been caused by ice-volume and/or sea-level fluctuations. Instead, the oxygen isotope shifts resulted primarily from large oscillations in sea-surface temperatures and indicate that the regional paleoceanography of the middle Eocene western North Atlantic was not consistently warm or stable. The large shifts in sea-surface temperatures could reflect variations in the position of the Gulf Stream relative to Blake Nose or variations in upwelling intensity.