Publication Date:
2024-04-25
Description:
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.
Keywords:
171-1052; Acarinina praetopilensis; Acarinina praetopilensis, δ18O; Blake Nose, North Atlantic Ocean; Chiloguembelina cubensis; Chiloguembelina cubensis, δ18O; Comment; COMPCORE; Composite Core; Counting 250-355 µm fraction; Depth, composite; DEPTH, sediment/rock; DSDP/ODP/IODP sample designation; Foraminifera, benthic; Foraminifera, benthic δ18O; Globigerinatheka mexicana; Globigerinatheka mexicana, δ18O; Hantkenina alabamensis; Hantkenina alabamensis, δ18O; Joides Resolution; Leg171B; Mass spectrometer VG Isogas Prism; Morozovella crassata; Morozovella crassata, δ18O; Morozovella spinulosa; Morozovella spinulosa, δ18O; Morozovella spp.; Morozovella spp., δ18O; Nuttallides truempyi; Nuttallides truempyi, δ18O; Ocean Drilling Program; ODP; Sample code/label; Subbotina utilisindex; Subbotina utilisindex, δ18O; Turborotalia cocoaensis; Turborotalia cocoaensis, δ18O; δ13C, carbonate
Type:
Dataset
Format:
text/tab-separated-values, 2744 data points
Permalink
