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Chronologie et sédimentologie du remplissage du lac d'Annecy depuis le Tardiglaciaire: Implications paléoclimatologiques et paléohydrologiques

Abstract : The sedimentary infill of the Lac d'Annecy (northwestern French Alps, 446m a.s.l) was investigated using short gravity cores and a 14m-long piston core taken in the deepest part of the basin (65m depth). The high resolution age-depth models result from combining 210Pb and 137Cs chronology, varve-counting, and the detection of historical flood events for the shorts cores. For the long core an age model was established by varve-counting (on numerical pictures), AMS 14C measurements, identification of d18O variations in Ostracods and tephra layer recognition. This investigation provides a continuous high resolution age depth model (from 5yrs. to 30yrs.) for the Holocene and the Late Glacial (15200 cal yrs BP at the base of the core). Magnetic parameters (magnetic susceptibility, MS; remnant magnetization parameters, ARM and IRM), laser granulometric analyses, carbonate contents, varve-thickness, and spectrophotometric properties (sediment lightness L*) have been investigated along the whole core in varying resolution from 0.3 cm to 10 cm. The results document local hydrological variations and climate variability since last glacial period. Major climatic shifts and events (Late Glacial climatic oscillations, Younger Dryas, 8.2k-event, Holocene optimum, Little Ice Age...) partially coincide with changes of drainage basin erosion and modifications of flood event frequency. Human impact is visible in the sediment record starting from 2700 years BP
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https://tel.archives-ouvertes.fr/tel-00010177
Contributor : Jérôme Nomade <>
Submitted on : Monday, September 19, 2005 - 4:55:50 PM
Last modification on : Thursday, November 19, 2020 - 3:54:26 PM
Long-term archiving on: : Thursday, September 23, 2010 - 3:10:10 PM

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Jérôme Nomade. Chronologie et sédimentologie du remplissage du lac d'Annecy depuis le Tardiglaciaire: Implications paléoclimatologiques et paléohydrologiques. Géologie appliquée. Université Joseph-Fourier - Grenoble I, 2005. Français. ⟨tel-00010177v3⟩

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