Reference : A 17,900-year multi-proxy lacustrine record of Lago Puyehue (Chilean Lake District): ...
Scientific journals : Article
Life sciences : Aquatic sciences & oceanology
Life sciences : Environmental sciences & ecology
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
Physical, chemical, mathematical & earth Sciences : Multidisciplinary, general & others
http://hdl.handle.net/2268/14821
A 17,900-year multi-proxy lacustrine record of Lago Puyehue (Chilean Lake District): introduction
English
De Batist, Marc [> > > >]
Fagel, Nathalie mailto [Université de Liège - ULg > Département de géologie > Argiles, géochimie et environnements sédimentaires >]
Loutre, Marie-France [> > > >]
Chapron, Emmanuel [> > > >]
2008
Journal of Paleolimnology
Springer Science & Business Media B.V.
39
2
151-161
Yes (verified by ORBi)
International
0921-2728
[en] lake ; deglaciation ; Late Glacial ; Holocene ; South America ; paleoclimate ; Paleolimnology
[en] This paper introduces the background and main results of a research project aimed at unravelling the paleolimnological and paleoclimatological history of Lago Puyehue (40 degrees S, Lake District, Chile) since the Last Glacial Maximum (LGM), based on the study of several sediment cores from the lake and on extensive fieldwork in the lake catchment. The longest record was obtained in an 11-m-long piston core. An age-depth model was established by AMS C-14 dating, Pb-210 and Cs-237 measurements, identification of event-deposits, and varve-counting for the past 600 years. The core extends back to 17,915 cal. yr. BP, and the seismic data indicate that an open-lake sedimentary environment already existed several thousands of years before that. The core was submitted to a multi-proxy analysis, including sedimentology, mineralogy, grain-size, major geochemistry and organic geochemistry (C/N ratio, delta C-13), loss-on-ignition, magnetic susceptibility, diatom analysis and palynology. Along-core variations in sediment composition reveal that the area of Lago Puyehue was characterized since the LGM by a series of rapid climate fluctuations superimposed on a long-term warming trend. Identified climate fluctuations confirm a.o. the existence of a Late-Glacial cold reversal predating the northern-hemisphere Younger Dryas cold period by 500-1,000 years, as well as the existence of an early southern-hemisphere Holocene climatic optimum. Varve-thickness analyses over the past 600 years reveal periodicities similar to those associated with the El Nino Southern Oscillation and the Pacific Decadal Oscillation, as well as intervals with increased precipitation, related to an intensification of the El Nino impact during the southern-hemisphere equivalent of the Little Ice Age.
SSTC
Researchers
http://hdl.handle.net/2268/14821
10.1007/s10933-007-9113-2

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Restricted access
MDB intro JOPL08.pdfPublisher postprint334.01 kBRequest copy

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.