Climate variability of southern Chile since the Last Glacial Maximum: a continuous sedimentological record from Lago Puyehue (40°S) |
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| Authors: | Sébastien Bertrand François Charlet Bernard Charlier Virginie Renson Nathalie Fagel |
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| Institution: | (1) Clays and Paleoclimate Research Unit, University of Liège, Liege, 4000, Belgium;(2) Renard Centre of Marine Geology, Universiteit Gent, Gent, Belgium;(3) Endogenous Petrology and Geochemistry Research Unit, University of Liège, Liege, Belgium;(4) Present address: Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, MS#25, Woods Hole, MA 02543, USA |
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| Abstract: | This paper presents a multi-proxy climate record of an 11 m long core collected in Lago Puyehue (southern Chile, 40°S) and
extending back to 18,000 cal yr BP. The multi-proxy analyses include sedimentology, mineralogy, grain size, geochemistry,
loss-on-ignition, magnetic susceptibility and radiocarbon dating. Results demonstrate that sediment grain size is positively
correlated with the biogenic sediment content and can be used as a proxy for lake paleoproductivity. On the other hand, the
magnetic susceptibility signal is correlated with the aluminium and titanium concentrations and can be used as a proxy for
the terrigenous supply. Temporal variations of sediment composition evidence that, since the Last Glacial Maximum, the Chilean
Lake District was characterized by three abrupt climate changes superimposed on a long-term climate evolution. These rapid
climate changes are: (1) an abrupt warming at the end of the Last Glacial Maximum at 17,300 cal yr BP; (2) a 13,100–12,300
cal yr BP cold event, ending rapidly and interpreted as the local counterpart of the Younger Dryas cold period, and (3) a
3,400–2,900 cal yr BP climatic instability synchronous with a period of low solar activity. The timing of the 13,100–12,300
cold event is compared with similar records in both hemispheres and demonstrates that this southern hemisphere climate change
precedes the northern hemisphere Younger Dryas cold period by 500 to 1,000 years.
This is the third in a series of eight papers published in this special issue dedicated to the 17,900 year multi-proxy lacustrine record of
Lago Puyehue, Chilean Lake District. The papers in this special issue were collected by M. De Batist, N. Fagel, M.-F. Loutre
and E. Chapron. |
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| Keywords: | Sediment Lake Grain size Magnetic susceptibility Climate Younger Dryas South America |
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