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Geology; January 2007; v. 35; no. 1; p. 37-40; DOI: 10.1130/G23204A.1
© 2007 Geological Society of America
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No change in the neodymium isotope composition of deep water exported from the North Atlantic on glacial-interglacial time scales

Gavin L. Foster*,1, Derek Vance1 and Julie Prytulak1

1 Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, Bristol BS8 1RJ, UK

Quantifying past circulation is a vital part of testing our understanding of the modern and future climate system. The isotopic composition of neodymium (Nd) in marine precipitates has considerable promise as a recorder of past circulation patterns, but its robust application requires knowledge of the end-member compositions in order to correctly deconvolute a downstream signal. We show here, using in situ, high temporal resolution analyses of ferro-manganese crusts from the North Atlantic, that the Nd isotopic composition of deep water during times of much more extensive Northern Hemisphere ice cover was no different than the modern-day interglacial value. This result is surprising, but greatly simplifies the use of Nd isotopes as tracers of the strength and patterns of circulation in the Atlantic in the past.

Key Words: thermohaline circulation • ferromanganese • neodymium • isotope geochemistry • North Atlantic Deep Water




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L. F. Robinson and T. van de Flierdt
Southern Ocean evidence for reduced export of North Atlantic Deep Water during Heinrich event 1
Geology, March 1, 2009; 37(3): 195 - 198.
[Abstract] [Full Text] [PDF]


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