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Termination of the Last Glaciation in the Iberian Peninsula Inferred from the Pollen Sequence of Quintanar de la Sierra

Published online by Cambridge University Press:  20 January 2017

M. Cristina Peñalba ,
Maurice Arnold ,
Joël Guiot ,
Jean-Claude Duplessy  and
Jacques-Louis de Beaulieu
M. Cristina Peñalba
Affiliation:
Instituto de Ecología—UNAM, Apdo. Postal 1354, Hermosillo, 83000, Sonora, México
Maurice Arnold
Affiliation:
Centre des Faibles Radioactivités, Laboratoire mixte CNRS-CEA, Parc du CNRS, F-91198, Gif-sur-Yvette Cedex, France
Joël Guiot
Affiliation:
Laboratoire de Botanique Historique et Palynologie, URA CNRS D1152, Faculté des Sciences et Techniques St. Jérôme, 13397, Marseille Cedex 13, France
Jean-Claude Duplessy
Affiliation:
Centre des Faibles Radioactivités, Laboratoire mixte CNRS-CEA, Parc du CNRS, F-91198, Gif-sur-Yvette Cedex, France
Jacques-Louis de Beaulieu
Affiliation:
Laboratoire de Botanique Historique et Palynologie, URA CNRS D1152, Faculté des Sciences et Techniques St. Jérôme, 13397, Marseille Cedex 13, France
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Abstract

A 4.5-m-thick late-glacial pollen sequence, supported by 17 AMS 14C dates, has been investigated at the Quintanar de la Sierra marshland (Iberian cordillera, north-central Spain). Pollen zones were defined that correspond to successive phases in vegetation history during the end of the Late Würm, late-glacial interstade, and Younger Dryas periods. A transfer function approach has been adopted to derive quantitative climate estimates from the pollen assemblage data. A first expansion ofJuniperus and Hippophae, about 13,500 14C yr B.P., indicates the beginning of the late-glacial interstade which is characterized by a Juniperus–Betula–Pinus succession that suggests higher temperatures and moisture than during full-glacial time. The Younger Dryas interval is recorded by a 120-cm-thick sediment unit that is dominated by herbaceous pollen. Transfer function estimates suggest that the climate during this period was cold, with low precipitation during most of the year, although not in summer. The Holocene arboreal recolonization in the area started about 10,000 14C yr B.P., with a renewed Juniperus–Betula–Pinus succession related to a strong increase in annual temperature and precipitation. The start of this process was synchronous with mean sea-surface temperature changes, as recorded from the nearby SU 81-18 marine core. The strong affinity with other European late-glacial pollen sequences demonstrates that the pattern of climatic changes during the last glacial–interglacial transition was similar in both northwestern and southwestern Europe.

Type
Research Article
Information
Quaternary Research , Volume 48 , Issue 2 , September 1997 , pp. 205 - 214
Copyright
University of Washington

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