HR: 0800h
AN: PP31A-1511    [Abstracts]
TI: Compound Specific Hydrogen Isotope Rations of Biomarkers Reconstruct the Palaeoclimate
AU: Gleixner, G
EM: gerd.gleixner@bgc-jena.mpg.de
AF: Max Planck Institute, POBox 100164, Jena, 07701 Germany
AU: * Sachse, D
EM: dsachse@bgc-jena.mpg.de
AF: Max Planck Institute, POBox 100164, Jena, 07701 Germany
AU: Muegler, I
EM: imuegler@bgc-jena.mpg.de
AF: Max Planck Institute, POBox 100164, Jena, 07701 Germany
AU: Radke, J
EM: jens.radke@thermo.com
AF: Max Planck Institute, POBox 100164, Jena, 07701 Germany
AU: Radke, J
EM: jens.radke@thermo.com
AF: Thermo Electron (Bremen) GmbH Finnigan Advanced Mass Spectrometry, Barkhausenstr. 2, Bremen, 28197 Germany
AB: We determined the compound specific isotope ratios of alkanes in order to test whether these isotope ratios are suitable to reconstruct the palaeoclimate. Therefore terrestrial and aquatic n-alkanes were extracted from lake sediments to estimate the isotopic composition of lake water and precipitation. This was done for lakes covering the climatic gradient from northern Finnland to southern Italy showing consistent results. In addition we compared sediments from closed lake sediments from humid and arid regions and found the isotopic difference between terrestrial and aquatic makers suitable to distinct between both systems. Finally we elaborated a correction function for thermally altered sediments in order to extent the reconstructions to the geological past. Our results suggest that compound specific isotope ratios of n-alkanes are a new proxy for the palaeoclimate.
DE: 0465 Microbiology: ecology, physiology and genomics (4840)
DE: 1041 Stable isotope geochemistry (0454, 4870)
DE: 1055 Organic and biogenic geochemistry
SC: Paleoceanography and Paleoclimatology [PP]
MN: Fall Meeting 2005