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Lateglacial and Holocene wet—dry cycles in southern Patagonia: chronology, sedimentology and geochemistry of a lacustrine record from Laguna Potrok Aike, Argentina

Sedimentology and Environmental Geology, Geoscience Center, University of Göttingen, Goldschmidtstr. 3, 37077 Göttingen, Germany, torsten.haberzettl{at}geo.uni-goettingen.de, Geomorphology and Polar Research (GEOPO-LAR), Institute of Geography, University of Bremen, Celsiusstr. FVG-M, 28359 Bremen, Germany

Hugo Corbella

Argentine Museum of Natural History, Av. Angel Gallardo 470, Buenos Aires, Argentina

Michael Fey

Geomorphology and Polar Research (GEOPO-LAR), Institute of Geography, University of Bremen, Celsiusstr. FVG-M, 28359 Bremen, Germany

Stephanie Janssen

Seminar for Geography and Education, University of Cologne, Gronewaldstr. 2, 50931 Cologne, Germany

Andreas Lücke

Institute for Chemistry and Dynamics of the Geosphere (ICG) V: Sedimentary Systems, Research Center Jülich, 52425 Jülich, Germany

Christoph Mayr

GeoBio-Center, University of Munich, Richard-Wagner-Str. 10, 80333 Munich, Germany

Christian Ohlendorf

Geomorphology and Polar Research (GEOPO-LAR), Institute of Geography, University of Bremen, Celsiusstr. FVG-M, 28359 Bremen, Germany

Frank Schäbitz

Seminar for Geography and Education, University of Cologne, Gronewaldstr. 2, 50931 Cologne, Germany

Gerhard H. Schleser

Institute for Chemistry and Dynamics of the Geosphere (ICG) V: Sedimentary Systems, Research Center Jülich, 52425 Jülich, Germany

Michael Wille

Seminar for Geography and Education, University of Cologne, Gronewaldstr. 2, 50931 Cologne, Germany

Sabine Wulf

Institute for Geophysics, Jackson School of Geosciences, The University of Texas at Austin, J.J. Pickle Research Campus, Bldg. 196, 10100 Burnet Rd, Austin TX 78758-4445, USA

Bernd Zolitschka

Geomorphology and Polar Research (GEOPO-LAR), Institute of Geography, University of Bremen, Celsiusstr. FVG-M, 28359 Bremen, Germany

A high-resolution multiproxy geochemical approach was applied to the sediments of Laguna Potrok Aike in an attempt to reconstruct moist and dry periods during the past 16 000 years in southeastern Patagonia. The age—depth model is inferred from AMS ¹⁴C dates and tephrochronology, and suggests moist conditions during the Lateglacial and early Holocene (16 000—8700 cal. BP) interrupted by drier conditions before the beginning of the Holocene (13 200—11 400 cal. BP). Data also imply that this period was a major warm phase in southeastern Patagonia and was approximately contemporaneous with the Younger Dryas chronozone in the Northern Hemisphere (12 700—11 500 cal. BP). After 8650 cal. BP a major drought may have caused the lowest lake level of the record. Since 7300 cal. BP, the lake level rose and was variable until the `Little Ice Age', which was the dominant humid period after 8650 cal. BP.

Key Words: Holocene • Younger Dryas • Lateglacial • `Little Ice Age' • lacustrine sediments • geochemistry • tephrochronology • multiproxy approach • Patagonia • Argentina.

The Holocene, Vol. 17, No. 3, 297-310 (2007)
DOI: 10.1177/0959683607076437


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