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Dating of Lake and Loess Sediments

  • Juerg Beer (a1) and Michael Sturm (a1)

Abstract

Lake and loess sediments represent archives that record important information about the iocal, regional and global climate conditions in the past. Lake sediments consist of autochthonous particles formed by biogeochemical processes within the lake and allochthonous particles brought into the lake from the catchment area. After deposition, the stratigraphy of the sediment can be altered by chemical, physical and biological processes. Under favored conditions, the sediment shows individual annual layers (varves), which can be used to date the sediment. Other dating methods are based on radioactive decay (14C, 210Pb) or on time markers such as tephra layers, deposits of natural catastrophes, e.g., floods, or radioactivity, e.g., emissions from a nuclear power plant.

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References

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Beer, J., Shen, C., Heller, F., Liu, T., Bonani, G., Dittrich, B., Kubik, P. and Suter, M. 1993 10Be and magnetic susceptibility in Chinese loess. Geophysical Research Letters 20: 5760.
Hajdas, I., Ivy, S. D., Beer, J., Bonani, G., Imboden, D., Lotter, A. F., Sturm, M. and Suter, M. 1993 AMS radiocarbon dating and varve chronology of Lake Soppensee: 6000 to 12,000 14C years BP. Climate Dynamics 9: 107116.
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Kukla, G., Heller, F., Liu, X. M., Xu, T. C., Liu, T. S. and An, Z. S. 1988 Pleistocene climates in China dated by magnetic susceptibility. Geology 16: 815818.
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Lotter, A. F., Ammann, B., Beer, J., Hajdas, I. and Sturm, M. 1992 A step towards an absolute time-scale for the Late-Glacial: Annually laminated sediments from Soppensee (Switzerland). in Bard, E. and Broecker, W., eds., The Last Deglaciation: Absolute and Radiocarbon Chronologies. NATO ASI Series I. Berlin, Springer-Verlag: 4568.
Shen, C., Beer, J., Tungshen, L., Oeschger, H., Bonani, G., Suter, M. and Wölfli, W. 1992 10Be in Chinese loess. Earth and Planetary Science Letters 109: 169177.
Sturm, M. 1979 Origin and composition of clastic varves. in Schlüchter, C., ed., Moraines and Varves. Rotterdam, Balkema: 281285.
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Wintle, A. G. 1990 A review of current research on TL dating of loess. Quaternary Science Reviews 9: 385397.

Dating of Lake and Loess Sediments

  • Juerg Beer (a1) and Michael Sturm (a1)

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