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New aspects of the interpretation of the loess magnetic fabric, Cérna Valley succession, Hungary

Published online by Cambridge University Press:  20 January 2017

Balazs Bradák-Hayashi
Affiliation:
Department of Planetology, Kobe University, 1-1, Rokkodai-cho, Nada-ku, Kobe, Hyogo, 657-8501, Japan Geographical Institute, Research Centre for Astronomy and Earth Sciences (HAS), 45 Budaörsi St., H-1112, Budapest, Hungary
Tamás Biró
Affiliation:
Department of Physical Geography, Eötvös Loránd University, 1/C Pázmány P. St, H-1117, Budapest, Hungary
Erzsébet Horváth
Affiliation:
Department of Physical Geography, Eötvös Loránd University, 1/C Pázmány P. St, H-1117, Budapest, Hungary
Tamás Végh
Affiliation:
Department of Physical Geography, Eötvös Loránd University, 1/C Pázmány P. St, H-1117, Budapest, Hungary
Gábor Csillag
Affiliation:
Geological and Geophysical Institute of Hungary, 14 Stefánia St., H-1143, Budapest, Hungary

Abstract

Anisotropy of magnetic susceptibility (AMS) is a frequently applied method in sedimentology, especially in the determination of the orientation of transport processes. We present an analysis of magnetic fabric (MF) studies on loess. New aspects of fabric development reveal: i) The deposition of the aeolian sediments was controlled by gravity, low-energy transport and local geomorphology, hence no clarified wind direction can be defined. ii) The influence of phyllosilicates is also significant among the magnetic components. iii) While the primary MF is relatively well-defined, the secondary MF is influenced by several processes. The analysis of stereoplots combined with the q—β diagram and photostatistics showed encouraging results during the characterization of various secondary MF such as redeposited MF and pedogenic fabric. iv) Changes in processes from aeolian to water-lain deposition and the increasing transportation energy were reflected by the connection between AMS and observed micro-scale sedimentary features. v) A relationship was obvious between the degree of pedogenesis and the transformation of sedimentary MF into a vertical MF typical for paleosols. vi) The significant role of very fine grained magnetite on the formation of inverse MF could not be excluded.

Type
Research Article
Copyright
Copyright © University of Washington 2016

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