Lipid geochemistry of a post-glacial lacustrine sediment |
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| Authors: | Laurent Wünsche Yery A Mendoza Fazil O Gülaar |
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| Institution: | Laurent Wünsche, Yery A. Mendoza,Fazil O. Gülaçar, |
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| Abstract: | The post-glacial environmental history of Voua de la Motte, a small pond, was studied by the lipid geochemistry of a 6 m long core. Palynological studies show that the deepest part of the core goes back to 10,000 yr BP corresponding to the time of formation of the lake following the retreat of the Rhodanian glacier. Hydrocarbons, aldehydes, linear alcohols, sterols, monocarboxylic and monohydroxy fatty acids, were determined throughout the core both in the free and bound lipid fractions, as well as in the tightly bound fraction for the carboxylic acids. There is no clear evidence of a transformation from the unbound to the bound form, except perhaps for the α-hydroxy acids.Qualitative as well as quantitative fluctuations in the distributions of these lipid classes were observed upward in the core. An attempt is made to correlate these fluctuations with the bioenvironmental and climatological evolution of the Basin on the basis of information obtained from palynology. |
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| Keywords: | lake sediments palynology lipids n-alkanes n-alcohols n-aldehydes sterols carboxylic acids hydroxyacids |
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