Abstract
In contrast to the loess-paleosol sequences of China and Central Europe, paleosols of the Halfway House and Gold Hill Steps loess sections in central Alaska show no enhancement in magnetic susceptibility. Evidence for maghemitization and ultrafine superparamagnetic minerals is found in the topsoil and in the lowest weathered loess of the sequence. These minerals are not detected in the three paleosols within the profiles. Rock-magnetic characteristics also indicate a smaller magnetic grain size in the loess with the lowest magnetic susceptibility values. This finding supports the interpretations of Begét et al. (1990) that magnetic concentration and corresponding susceptibility variations may be related to changes in wind intensity.
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