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| Titel |
Dolní VÄstonice (Czech Republic): a new high-resolution loess-palaeosol record of the last climatic cycle in Central Europe |
| VerfasserIn |
Pierre Antoine, Denis-Didier Rousseau, Christine Hatté, France Lagroix, Markus Fuchs, Olivier Moine, Caroline Gauthier, Jiri Svoboda, Lisa Lenka |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250052988
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| Zusammenfassung |
| On the basis of multidisciplinary high-resolution records performed in key sites from Western and Central Europe, our group demonstrates that loess sequences result from rapid and cyclic aeolian deposition phases, and that a correlation exists between variations in both loess grain size indexes and Greenland ice-core dust records, suggesting a global connection between North Atlantic and west-European air masses. In this context, the key sequence of Dolní Věstonice (DV) in southern Czech Republic has been investigated within the ANR “ACTES” program, in order to build a 50°N transect from northern France to Ukraine across the European loess belt. From the multidisciplinary study performed in DV, we present here the high-resolution grain-size record and a new set of 14 OSL dates. The grain size record (15 m high profile; 300 samples) shows a strongly contrasted pattern with significant abrupt coarse-grained events well marked in the sand fraction, which are especially well preserved in the upper part of the sequence between ca. 20-30 ka. We also observe a progressive coarsening of the loess deposits during this period as already noticed in other European sequences. Besides, the base of the DV sequence exhibits an exceptionally well-preserved Eemian-Early Glacial soil complex allowing a detailed reconstruction of environmental changes between ca. 125-70 ka. This soil complex is composed by two stacked subsequences like in Western Europe: at the base, a condensed record of MIS5 (< 1m), characterised by colluvial processes, superimposed pedogenesis ending with a first chernozem-like horizon; in the upper part, a thick sequence (~ 2.5m), showing a cyclic succession of two chernozem soil horizons and an important development of the sedimentation rate linked to the deposition of aeolian silts (“marker loess”). |
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