Magnetic polarity stratigraphy of fluvial sediments: an example from the Heidelberg Basin
2 Chair of Geomorphology, University of Bayreuth & BayCEER, University of Bayreuth
3 Leibniz Institute for Applied Geophysics, Hannover
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02.10.2014, 12:15-12:30, H36, NW III
Magnetostratigraphic investigations are a powerful tool for the age determination of sedimentary successions. Due to the scarcity of appropriate outcrops and the complexity and often also in-completeness of the recorded magnetic polarity signal the analyses of fluvial sequences are generally under-represented compared to studies of other environments. The Heidelberg Basin hosts one of the thickest sequences of fluvio-lacustrine Plio-Pleistocene sediments in Central Europe and provides the rare opportunity to study a unique sedimentary archive of climate history and environmental change. Up till now, the analysis of this archive was hindered by the lack of a chronostratigraphic framework. Instead, the successions were classified by lithological and hydrogeological criteria. Cores from deep drillings within the basin provide the base for the latest multidisciplinary analyses of the sedimentary sequences of the Heidelberg Basin. While luminescence dating were able to give a few numerical age constrains for the uppermost 100 meters of the cores, the biostratigraphy is still the subject of debate. We provide a consistent magnetic polarity stratigraphy of the sediments from the Heidelberg Basin. The extracted age constrains allow for an unambiguous correlation down to the Gauss-Matuyama boundary. The Neogene deposits could not be unequivocally classified. By applying age-depth plots, we tentatively identified the most plausible correlation schemes among several scenarios.
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