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| Titel |
The environmental magnetic fingerprint of periglacial loess in Eastern Germany |
| VerfasserIn |
Philipp Baumgart, Ulrich Hambach, Sascha Meszner, Dominik Faust  |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250072888
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| Zusammenfassung |
| In the framework of a comprehensive stratigraphic study of loess Eastern Germany, a detailed
rock magnetic study was carried out of four last glacial/interglacial loess-palaeosol
sequences. Magnetic susceptibility and laboratory-induced remanences have been determined
to compare individual sections and to identify the specific rock magnetic characteristics of the
Saxonian Loess Province.
According to the model of pedogenic magnetic enhancement, an increasing neoformation
of ferrimagnetic minerals in the course of pedogenesis was observed only in the uppermost
Late Weichselian lithological units consisting of almost unweathered loess and
indicating dryer climatic conditions. In contrast, the rock magnetic characteristics of
the lower Middle and Early Weichselian units exhibit a significant destruction of
primary magnetic minerals caused by such secondary processes as climatically
controlled waterlogging and reworking. The main observation, an increasing Ïfd with
decreasing Ï with stratigraphic depth, argues for a general magnetic depletion in
conjunction with decreasing magnetic grain sizes caused by weathering of larger primary
particles.
The magnetic fingerprint of the Saxonian loess is characterised by prevailing magnetic
depletion processes, which effectively rules out the application of the wind vigour model.
Moreover, the observed magnetic characteristics differ significantly from that of other
loess regions. Therefore, we propose a new magnetic facies model for more humid
(Central European) loess provinces dominated by typical periglacial conditions, including
widespread permafrost, which control the intense reworking and waterlogging (gleyification)
processes. |
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