Abstract
Statistical analytical methods were applied to classify the magnetic fabric of samples from different Hungarian loess profiles. A previous study of the anisotropy of magnetic susceptibility (AMS) of Hungarian loess suggested that ‘typical’ (wind-blown or undisturbed) and ‘redeposited’ loess were well differentiated by known statistical methods. The analyses of new samples require a review of previous results and the terms like ‘typical’ (wind-blown), ‘reworked’ and ‘redeposited’ loess.The type of magnetic fabric of fine-layered loess is classified by a new mathematical method in AMS study of loess: hierarchical cluster analysis. The following Quaternary surface processes were revealed by characteristics of the magnetic fabric of Hungarian loess:The primary magnetic fabric preserves the possible transport or accumulation direction of dust (direction of maximum susceptibility, NE/SW axis) and the structure of the fabric was affected by compaction. In the case of loess, the deviation of the inclination from vertical indicates the accumulation of dust on a sloping surface.The secondary magnetic fabric (fabric of the material after reworking or redeposition) of loess shows the magnetic fabric characteristics of reworked or redeposited material. Scattered values of the principal susceptibilities indicate the effect of bioturbation. Redeposition (fine-layered loess samples) is indicated by the alignment of the direction of maximum and intermediate susceptibilities on a stereographic plot and the degree of alignment possibly indicates the energy of the surface process (lower or higher degree of energy connected to different kind of surface process can produce different kind of magnetic fabric).The magnetic mineralogy of the pilot samples is determined by isothermal remanent magnetisation (IRM) measurements. No differences between loess samples with different sedimentary structure could be shown. The dominant phase in the magnetic fabric that determined the magnetic character of samples was magnetite/maghemite.
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