Unknown
PANGAEA
In:
Supplement to: Friedrich, Oliver; Herrle, Jens O; Kößler, Peter; Hemleben, Christoph (2004): Early Maastrichtian stable isotopes: changing deep water sources in the North Atlantic? Palaeogeography, Palaeoclimatology, Palaeoecology, 211(1-2), 171-184, https://doi.org/10.1016/j.palaeo.2004.05.004
Publication Date:
2023-06-27
Description:
We propose that the observed short-term stable isotope fluctuations reflect changes in high- and low-latitude intermediate to deep water sources, based on a high-resolution stable isotope record of planktic and benthic foraminifera from the Early Maastrichtian (~71.3 to ~ 69.6 Ma) of Blake Nose (DSDP Site 390A, North Atlantic). Sources of these waters may have been the low-latitude eastern Tethys and high-latitude North Atlantic. Changes in intermediate to deep water sources were probably steered by eccentricity-controlled insolation fluctuations. Lower insolation favored the formation of high-latitude deep waters due to positive feedback mechanisms resulting in high-latitude cooling. This led to a displacement of low-latitude deep waters at Blake Nose. Higher insolation reduced intermediate to deep-water formation in high latitudes, yielding a more northern flow of low-latitude deep waters.
Keywords:
44-390A; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg44; North Atlantic
Type:
Dataset
Format:
application/zip, 2 datasets
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