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Land–sea correlations for the last glaciation inferred from a pollen and dinocyst record from the Portuguese margin

Published online by Cambridge University Press:  20 January 2017

Jean-Louis Turon ,
Anne-Marie Lézine  and
Michelle Denèfle
Jean-Louis Turon*
Affiliation:
Département de Géologie et Océanographie EPOC UMR CNRS 5805, Université Bordeaux 1, 33405 Talence Cedex, France
Anne-Marie Lézine
Affiliation:
ESA7073 CNRS Paléontologie et Stratigraphie, Université Pierre et Marie Curie, 75252 Paris Cedex 5, France
Michelle Denèfle
Affiliation:
URA141 CNRS Géographie Physique, 1 Place Aristide Briand, 92195 Meudon Principal Cedex, France
*
*Corresponding author. E-mail address: turon@geocean.u-bordeaux.fr (J.-L. Turon).
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Abstract

Pollen and dinoflagellate cyst assemblages from Core SU 81-18 recovered off Portugal (37°46′N, 10°11′W; 3135-m water depth) have been used to document the short-term environmental changes that occurred in southwest Europe since 25,000 yr B.P. The relationship between the oceanic and continental environments has been further examined by the use of other marine proxies (coarse sedimentary fraction, foraminifera) and by comparison with proximal land pollen records. Heinrich 2 (H2) and Heinrich 1 (H1) events were the most extreme parts of the highly variable last glacial period, with the maximum extension of dry steppe on land and the occurrence of cool and dilute waters at the core site. Our study shows that H1 and H2 are divided in two distinct phases: one with Neogloboquadrina pachyderma left coiling associated with the maximum input of ice rafted debris, reflecting the in situ release of icebergs and the occurrence of cool and dilute seawater at the core site; the other with dinoflagellate cysts of subpolar affinity, Bitectatodinium tepikiense, reflecting a seasonal control marked by warm summer SST and cold winter SST.

Keywords

PollenDinocystsEastern AtlanticLast glacial, Heinrich eventsPaleoenvironmentsPaleoclimate
Type
Articles
Information
Quaternary Research , Volume 59 , Issue 1 , January 2003 , pp. 88 - 96
Copyright
Elsevier Science (USA)

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