NDLI: Chronology and depositional processes of the laminated sediment record from Lac d'Annecy, French Alps

Content Provider	Springer Nature Link
Author	Brauer, Achim Casava, Joël
Copyright Year	2001
Abstract	A high resolution sediment record spanning the entire time since the ice retreat after the Last Glacial Maximum has been recovered from Lac d'Annecy. The main focus of this study is to develop a reliable chronology of the record and to evaluate the environmental variability during the period of Late Würmian ice retreat. Most of the record is laminated. These laminations are of different structure, composition, and thickness. On the basis of varve stratigraphy five sedimentation units were identified which correspond to particular stages in the deglaciation of the region. Except for one each facies type has been related to an annual cycle of deposition. Varve counting in combination with radiocarbon dating provides the time control of the record and dates the base of lacustrine deposits to 16,600 varve yrs BP. The beginning of the Late Glacial is marked by a shift from clastic to endogenic carbonate varves caused by the climatic warming. Clastic varves have been further subdivided into a succession of complex and standard varve types. These variations of clastic varve formation are triggered by the ice retreat and related hydrological variations in the watershed of the lake. Sedimentological, mineralogical and isotopic data help identify different sediment sources of the sub-layers. Proximal sediments originate from local carbonaceous bedrock whereas distal sediments have characteristics of the molassic complex of the outer Alps. The alternation of proximal and distal sediments in the varve sequence reflects the deglaciation of the Annecy area with a changing influence of local and regional glaciers. The melting of the Alpine ice sheet is the driving force for regional environmental changes which in turn control the sediment transport and deposition processes in Lac d'Annecy.
Starting Page	163
Ending Page	177
Page Count	15
File Format	PDF
ISSN	09212728
Journal	Journal of Paleolimnology
Volume Number	25
Issue Number	2
e-ISSN	15730417
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2001-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sedimentology Physical Geography Hydrobiology Climate Change
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Aquatic Science

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