Characteristics of Pleistocene climate cycles identified in Cérna Valley loess-paleosol section (Vértesacsa, Hungary)

B. Bradák, E. Thamó-Bozsó, J. Kovács, E. Márton, G. Csillag, E. Horváth

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Abstract

A climate cycle model was calculated using different methods (e.g., paleomagnetic, sedimentological and heavy mineral studies) on the loess sequence containing four paleosol and five loess layers in Cérna Valley. The model is based on the development of the sediment sequence created by the influence of the climatic, geological and geomorphological phenomena, and contains the following cycles:. • The homogeneous, non-laminated loess was developed during the semiarid (350-400mm/y) and cold periods in the Pleistocene. The magnetic fabric was built up by multidomain, ferromagnetic minerals and reflects the direction of dust deposition or/and the paleoslope.• The accumulation period of dust was followed by a more humid (650mm/y) pedogenic period, indicated by the enrichment of superparamagnetic minerals and by the disturbed or inverse magnetic fabric developed during pedogenesis by different processes (e.g., leaching, bioturbation).• The third period following the pedogenic period is a humid erosional phase indicated by the fine layered reworked loess. The magnetic fabric built up by multidomain ferro- and superparamagnetic minerals was characterized by better aligned directions of principal susceptibilities than in the wind-blown material. Sheet wash and other water logged surface processes appeared in the fabric of these layers. This process is possibly connected to non-periodic, sudden events with high precipitation and absence of the vegetation. • The next cycle started with the following dust accumulation period.

Original languageEnglish
Pages (from-to)86-97
Number of pages12
JournalQuaternary International
Volume234
Issue number1-2
DOIs
Publication statusPublished - Apr 1 2011

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ASJC Scopus subject areas

  • Earth-Surface Processes

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