We tested the remanence of two short sediment cores of Holocene age from Lake Balaton for the secular variation of the geomagnetic field. IRM runs and S-ratio values point to a ferrimagnetic phase (magnetite, maghemite) as the dominant magnetic mineral present in the sediment. On the Wohlfarth-Cisowski test the behaviour is interacting single domain but there is an abundance of superparamagnetic particles as well as shown by the high degree of viscosity on AF-demagnetisation. Combined with linearity analysis the latter was applied to separate and identify those remanence components which were thought to have been imprinted by the geomagnetic field. After disposing of the severly outlying remanence directions, the mean direction in both cores agrees well with the local direction of the axial dipole field but the individual directions do not seem to follow any regular course expected for the secular variation.
|Number of pages||7|
|Publication status||Published - Dec 1 2007|
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