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Temporal evolution of sediment supply in Lago Puyehue (Southern Chile) during the last 600 yr and its climatic significance

Published online by Cambridge University Press:  20 January 2017

Sébastien Bertrand ,
Xavier Boës ,
Julie Castiaux ,
François Charlet ,
Roberto Urrutia ,
Cristian Espinoza ,
Gilles Lepoint ,
Bernard Charlier  and
Nathalie Fagel
Sébastien Bertrand*
Affiliation:
Clays and Paleoclimate Research Unit, Department of Geology, University of Liège, Allée du 6 août, B18, 4000 Liège, Belgium
Xavier Boës
Affiliation:
Clays and Paleoclimate Research Unit, Department of Geology, University of Liège, Allée du 6 août, B18, 4000 Liège, Belgium
Julie Castiaux
Affiliation:
Clays and Paleoclimate Research Unit, Department of Geology, University of Liège, Allée du 6 août, B18, 4000 Liège, Belgium
François Charlet
Affiliation:
Renard Centre of Marine Geology (RCMG), University of Ghent, 9000 Ghent, Belgium
Roberto Urrutia
Affiliation:
Centro EULA, University of Concepción, Concepción, Chile
Cristian Espinoza
Affiliation:
Centro EULA, University of Concepción, Concepción, Chile
Gilles Lepoint
Affiliation:
Marine Research Centre (MARE), Laboratory of Oceanology, University of Liège, 4000 Liège, Belgium
Bernard Charlier
Affiliation:
Endogenous Petrology and Geochemistry Research Unit, University of Liège, 4000 Liège, Belgium
Nathalie Fagel
Affiliation:
Clays and Paleoclimate Research Unit, Department of Geology, University of Liège, Allée du 6 août, B18, 4000 Liège, Belgium
*
*Corresponding author. Fax: +32 4 366 22 02. E-mail address:Seb.Bertrand@gmail.com (S. Bertrand).
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Abstract

Short-term climate changes in Southern Chile are investigated by a multi-proxy analysis of a 53-cm-long sedimentary sequence selected among eight short cores retrieved in Lago Puyehue (Chile, 40°S). This core contains a 600-yr-long undisturbed record of paleo-precipitation changes. Two measurement methods for sediment density, organic matter and biogenic silica contents are compared and the most appropriate techniques are selected. Together with aluminium and titanium concentrations, grain size and geochemical properties of the organic matter, these proxies are used to demonstrate paleo-precipitation changes around 40°S. Increase of terrigenous particle supply between A.D. 1490 and A.D. 1700 suggests a humid period. Contemporaneously, δ13C data show increasing lake productivity, in response to the high nutrient supply. The A.D. 1700–1900 interval is characterized by a decreasing terrigenous supply and increasing δ13C values, interpreted as a drying period. The magnetic susceptibility signal, reflecting the terrigenous/biogenic ratio, demonstrates that similar variations occur in all the undisturbed sedimentary environments of Lago Puyehue. The A.D. 1490–1700 wet period is associated with the onset of the European Little Ice Age (LIA) and interpreted as its local signature. This work supports the fact that the LIA was a global event, not only restricted to the Northern Hemisphere.

Keywords

Southern ChileLast millenniumPaleolimnologyLittle Ice AgeSediments
Type
Research Article
Information
Quaternary Research , Volume 64 , Issue 2 , September 2005 , pp. 163 - 175
Copyright
Copyright © University of Washington

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