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Temporal evolution of sediment supply in Lago Puyehue (Southern Chile) during th
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Title:
Temporal evolution of sediment supply in Lago Puyehue (Southern Chile) during the last 600 yr and its climatic significance
Authors:
Bertrand, Sébastien; Boës, Xavier; Castiaux, Julie; Charlet, François; Urrutia, Roberto; Espinoza, Cristian; Lepoint, Gilles; Charlier, Bernard; Fagel, Nathalie
Affiliation:
AA(Clays and Paleoclimate Research Unit, Department of Geology, University of Liège, Allée du 6 août, B18, 4000 Liège, Belgium), AB(Clays and Paleoclimate Research Unit, Department of Geology, University of Liège, Allée du 6 août, B18, 4000 Liège, Belgium), AC(Clays and Paleoclimate Research Unit, Department of Geology, University of Liège, Allée du 6 août, B18, 4000 Liège, Belgium), AD(Renard Centre of Marine Geology (RCMG), University of Ghent, 9000 Ghent, Belgium), AE(Centro EULA, University of Concepción, Concepción, Chile), AF(Centro EULA, University of Concepción, Concepción, Chile), AG(Marine Research Centre (MARE), Laboratory of Oceanology, University of Liège, 4000 Liège, Belgium), AH(Endogenous Petrology and Geochemistry Research Unit, University of Liège, 4000 Liège, Belgium), AI(Clays and Paleoclimate Research Unit, Department of Geology, University of Liège, Allée du 6 août, B18, 4000 Liège, Belgium)
Publication:
Quaternary Research, Volume 64, Issue 2, p. 163-175.
Publication Date:
09/2005
Origin:
CROSSREF; ELSEVIER
Abstract Copyright:
(c) 2005 University of Washington
DOI:
10.1016/j.yqres.2005.06.005
Bibliographic Code:
2005QuRes..64..163B

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, δでるた 13C 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 δでるた 13C 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.
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