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Direct land/sea correlation of the Eemian, and its comparison with the Holocene: a high-resolution palynological record off the Iberian margin

Published online by Cambridge University Press:  01 April 2016

M.F. Sánchez Goñi ,
J.-L. Turon ,
F. Eynaud ,
N.J. Shackleton  and
O. Cayre
M.F. Sánchez Goñi
Affiliation:
Département de Géologie et Océanographie, UMR-CNRS 5805, Université Bordeaux I, Avenue des Facultés, 33405 TALENCE, France Instituto de Ciencias de la Tierra ‘Jaume Almera’, CSIC, Lluís Solé i Sabarís s/n, 08028 BARCELONA, Spain
J.-L. Turon
Affiliation:
Département de Géologie et Océanographie, UMR-CNRS 5805, Université Bordeaux I, Avenue des Facultés, 33405 TALENCE, France
F. Eynaud
Affiliation:
Département de Géologie et Océanographie, UMR-CNRS 5805, Université Bordeaux I, Avenue des Facultés, 33405 TALENCE, France
N.J. Shackleton
Affiliation:
Godwin Institute for Quaternary Research, Department of Earth Sciences, Godwin Laboratory, Pembroke Street, CAMBRIDGE CB2 3SA, UK
O. Cayre
Affiliation:
CNRS-CEREGE, BP 80, 13545 AIX-EN-PROVENCE Cx 4, France

Abstract

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High-resolution pollen, dinocyst and isotopie profiles covering the marine isotope stage 5 (MIS 5) are presented from core MD952042 (Tagus abyssal plain, 37°47'N, 10°09'W). Both marine and terrestrial proxies indicate the occurrence of a Bølling-Allerød-Younger Dryas-like event at the beginning of MI substage 5e. The terrestrial Eemian stage coincides with both the lightest oxygen isotope values of substage 5e and the heavier ones approaching the 5e/5d transition. Accordingly, the Eemian is not equivalent to MI substage 5e, as the Holocene is not equivalent to MIS 1.

Remarkably, both pollen and dinocyst data reflect the same climatic pattern on land and ocean, and they evidence a succession of climatic events that the isotope signal does not identify. The Eemian began with a Mediterranean vegetation that was gradually replaced by Eurosiberian formations indicating a change from Mediterranean to oceanic climates. In the middle of the Eemian, warming conditions were interrupted by an event corresponding to a slight cooling resulting from an increase in precipitation over land and ocean. Finally, a warming trend characterised the last phase of the Eemian. The occurrence of small climatic changes during this interglacial is inconsistent with the dramatic variability suggested by the GRIP ice-core record.

Keywords

climatedinocystsEemianNorth Atlanticmarine isotope substage 5eplanktonic isotopespollensouthwestern Europevegetation
Type
Research Article
Information
Netherlands Journal of Geosciences , Volume 79 , Issue 2-3 , August 2000 , pp. 345 - 354
Copyright
Copyright © Stichting Netherlands Journal of Geosciences 2000

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