Publication Date:
2019
Description:
〈span〉〈div〉Summary〈/div〉Anisotropy of magnetic susceptibility (AMS) measurements, a commonly used method, has been applied in loess to determine dominant paleowind direction during the Pleistocene. During the last session of sampling and detailed magnetic investigation of the Early Middle Pleistocene loess/paleosol succession at Paks (Hungary), ‘irregular’ (i.e. non-flow aligned magnetic fabrics (MF) were revealed from sedimentary records having uniform sedimentary parameters. Recent knowledge about the origin of irregular loess fabrics are still limited, although they may carry additional paleoenvironmental informations. The appearance of irregular MF suggests that a constant set of paleoclimatological conditions, as indicated by the layer characteristics, was interrupted by abrupt events. To characterize the unusual event horizons, the MF of the horizons and of both the under- and overlying material were analysed and compared by rock magnetic methods, such as hysteresis, temperature dependence of magnetic susceptibility and AMS.The analysis separated three types of irregular fabric and revealed three scenarios which might have been responsible for the forming of the irregular MF: abrupt climate changes, including rapid (catastrophic) weather events (e.g. intensification of strong wind or water-lain processes); short term pedogenesis during glacials; and post-depositional deformation triggered by mass movements or seismic activity.〈/span〉
Print ISSN:
2051-1965
Electronic ISSN:
1365-246X
Topics:
Geosciences
Published by
Oxford University Press
on behalf of
The Deutsche Geophysikalische Gesellschaft (DGG) and the Royal Astronomical Society (RAS).
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