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| Titel |
First isotopic organic geochemical data of the Dolni Vestonice (Czech Republic) loess sequence: evidence of Westerlies influence all along the last climate cycle |
| VerfasserIn |
Christine Hatté, Caroline Gauthier, Denis-Didier Rousseau, Pierre Antoine, Markus Fuchs, France Lagroix, Olivier Moine, Adriana Sima, Lisa Lenka, Jiri Svoboda |
| 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 |
250049623
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| Zusammenfassung |
| Within the ANR-ACTES project, isotopic organic geochemistry (δ13Corg) study has been
performed in the Dolni Vestonice loess-paleosol sequence in Czech Republic in parallel with
other proxy studies like grain size, pedology, environmental magnetism and magnetic
anisotropy, stratigraphy-¦ The studied record covers the last climate cycle and the present
Holocene with a high sedimentation of about 20 meters.
The Czech sequence provides a high temporal resolution isotopic record that
characterizes paleoclimate rapid events of the Upper Pleistocene in Central Europe.
Furthermore, it shows that, thanks to the specific sedimentation conditions (high
accumulation, cold and arid environmental conditions) and if adequate chemical treatment is
applied to sediment, typical loess δ13Corg nicely reflects the original vegetation isotopic
composition. Conversely paleosol δ13Corg can only be interpreted in terms of qualitative
paleoenvironmental variations because of pedogenesis impact on the original vegetation
isotopic signature.
Organic geochemistry investigation allows also the characterization in terms of
environmental parameters (e.g. mean annual precipitation and precipitation annual
distribution) of short events recorded concomitantly by all investigated proxies.
We present the first organic and isotopic geochemical record of this loess sequence that,
in association to the OSL and 14C dating based chronology, we interpret in terms of past
climatic changes. The determined climatic evolution in Central Europe is then compared with
other climate records determined in European loess sequences at different latitudes. |
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