Late Glacial-Holocene sequence of Lake Saint-Point (Jura Mountains, France): Detrital inputs as records of climate change and anthropic impact |
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| Authors: | Aurlie Leroux Vincent Bichet Anne-Vronique Walter-Simonnet Michel Magny Thierry Adatte milie Gauthier Herv Richard Agns Baltzer |
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| Institution: | aLaboratoire chrono-environnement, UMR CNRS 6249, université de Franche-Comté, 16, route de Gray, 25030 Besançon cedex, France;bInstitut de géologie, université de Neuchâtel, 11, rue Émile-Argand, 2007 Neuchâtel, Suisse;cLaboratoire de morphologie continentale et côtière, UMR 6143 M2C, université de Caen, 24, rue des Tilleuls, 14032 Caen cedex, France |
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| Abstract: | A sediment sequence (SP05, 12.5 m long) was taken from the deep zone of Lake Saint-Point (850 m a.s.l.). Sedimentological analyses highlight two main contrasted periods of sedimentation: the Last Glacial Maximum (LGM)/Late Glacial characterized by high silicates and quartz contents the Holocene dominated by the carbonated fraction. At the beginning of the Holocene (11 400 years cal. BP), silicates fraction flux abruptly decreased. The shift between the Late Glacial and the Holocene periods may be explained by forest development in the catchment. From 10 200 to 6800 years cal. BP, silicates and detrital carbonate fractions remained stable before they progressively increased steady till 5000 years cal. BP. Both increases cannot be totally attributed to an anthropic impact since pollen data indicate continuous anthropic activities only dated back from 3000 years cal. BP. They thus resulted from a dominant climatic control. From 5000 years cal. BP, silicates content still increased while detrital carbonates input became steady due to a change in pedogenetic processes affecting the catchment. During the last millennium, silicates and detrital carbonate decreased, probably due to pastureland development. |
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| Keywords: | Lake Detristism Holocene Carbonates Anthropic ClimateMots clé s: Lac Dé tritisme Holocè ne Carbonates Anthropique Climat |
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