BioArchive Tswaing Crater
With a thickness of approximately 90 m the sediments of the Tswaing crater lake represent an important record for the global climate change on the southern hemisphere over the last 200,000 years and contain detailed information on the evolution of the lake ecosystem. During the first phase of the project the climatic variations of South Africa were reconstructed in a multi-proxy approach [Kirsten et al., 2007. South African Journal of Geology 110, 311 – 326]. Analyses of lipid biomarkers and their isotopic signature provided first insights into the carbon cycle and its variations during the last 14,000 years which were closely linked to climate changes.
Currently, we examine these variations and the evolution of the lake ecosystem in a more detailed study by the application of compound-specific hydrogen isotopes on selected lipid biomarkers aiming specifically at the understanding of hydrological changes such as variations in the precipitation and evaporation. Moreover, the climatic effect on the evolution of the lake environment and the biocoenosis will be elucidated.
- H. Wilkes
- F. Schmidt
- H. Oberhänsli (Section 3.3)
- I. Kristen
- T. Partridge, University of the Witwatersrand, South Africa
Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum