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Early Maastrichtian stable isotopes: Changing deep water sources in the North Atlantic?

Friedrich, O., Herrle, J.O., Koessler, P. and Hemleben, C. (2004) Early Maastrichtian stable isotopes: Changing deep water sources in the North Atlantic? Palaeogeography, Palaeoclimatology, Palaeoecology, 211, (1-2), pp. 171-184. (doi:10.1016/j.palaeo.2004.05.004).

Record type: Article

Abstract

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.

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Published date: 19 August 2004
Keywords: Cretaceous climate, Ocean circulation, North Atlantic, Stable isotopes

Identifiers

Local EPrints ID: 49985
URI: http://eprints.soton.ac.uk/id/eprint/49985
ISSN: 0031-0182
PURE UUID: 1d7e947d-a513-4251-bb20-f45d2510aad3

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Date deposited: 08 Jan 2008
Last modified: 17 Jul 2017 14:54

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Contributors

Author: O. Friedrich
Author: J.O. Herrle
Author: P. Koessler
Author: C. Hemleben

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