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Holocene palaeoclimates of southern Patagonia: limnological and environmental history of Lago Cardiel, Argentina

Institute of Arctic and Alpine Research, University of Colorado, Boulder, Colorado 80309–0450, USA: markgraf{at}spot.colorado.edu

J. Platt Bradbury

5784 Horseradish Gulch, Golden Colorado 80403, USA

Antje Schwalb

Institut für Umwelt-Geochemie, Universität Heidelberg, Im Neuenheimer Feld 236, D-69120 Heidelberg, Germany

Stephen J. Burns

Department of Geosciences, University of Massachusetts, Amherst, Massachusetts 01003–5820, USA

Charles Stern

Department of Geological Sciences, University of Colorado, Boulder, Colorado 80309–0399, USA

Daniel Ariztegui

Geological Institute, Swiss Federal Institute of Technology ETHZ, Sonneggstrasse 5, CH-8092 Zürich, Switzerland: Institut Forel and Department of Geology and Paleontology, University of Geneva, Rue des Maraichers 13, CH-1211 Geneva 4, Switzerland

Adrian Gilli

Geological Institute, Swiss Federal Institute of Technology ETHZ, Sonneggstrasse 5, CH-8092 Zürich, Switzerland

Flavio S. Anselmetti

Geological Institute, Swiss Federal Institute of Technology ETHZ, Sonneggstrasse 5, CH-8092 Zürich, Switzerland

Scott Stine

Department of Geography and Environmental Studies, California State University, Hayward, California 94542, USA

Nora Maidana

Departamento de Ciencias Biologicas, Laboratorio de Morfologia Vegetal, Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, 1428 Buenos Aires, Argentina

Multiproxy palaeoenvironmental and palaeolimnological analyses of two Holocene-age sediment cores from the margin of Lago Cardiel, a 76 m deep, closed-basin lake in southern Patagonia (latitude 49°S), provide information on lake-level changes that can be related to regional palaeoclimate scenarios. Sedimentol ogic (magnetic susceptibility, organic and inorganic carbon content) and environmental indicators (pollen, dia toms, ostracodes and stable isotopes on ostracodes) show lake levels markedly higher than today during the early Holocene, following a rapid lake-level rise after a desiccation phase prior to 11000 BP. After about 6000 BP, lake levels were generally lower, but underwent repeated fluctuations. These inferred changes support the previously proposed view that the southern westerly stormtracks were focused (zonal) north of latitude 50°S during the early Holocene, allowing for Antarctic cold fronts to bring easterly moisture to southern Patagonia, whereas during the late Holocene the stormtracks shifted seasonally, with an overall more meridional behaviour, resulting in less and more variable moisture at these latitudes.

Key Words: Environmental history • multiproxy approach • palaeolimnology • palaeoclimates • lake levels • storm-tracks • Patagonia • Lago Cardiel • Argentina • South America • Holocene

The Holocene, Vol. 13, No. 4, 581-591 (2003)
DOI: 10.1191/0959683603hl648rp


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