Geochemical characteristics of sediments are responses to physical and chemical alteration
in landslides. However, consequences of in situ interactions associated with landslides
are difficult to distinguish from those related to long-term weathering in young soft
sediments such as loess. In this study, geochemical characteristics of the Kulcs landslide
in Hungary are studied to identify the provenance of the loess–paleosol–red clay sequence
and geochemical signatures that can potentially be attributed to the effects of landsliding.
Results indicate that sliding is largely initiated by the lithological changes within
the landslide body. Sediments above the sliding zone closely resemble the non-slipped
Pleistocene old loess deposits from Hungary. It is also confirmed that the sliding
zone develops in old paleosols in the loess sequence and red clays at its base which
are all characterized by the enrichment of Al, K, Na, H2O and considerable depletion
in Ca and Mg associated with carbonates. Altogether, these geochemical characteristics
indicate that chemical weathering trend of unconsolidated landslide sediments is slightly
modified by the redistribution of carbonates and decomposition of plagioclase. It
is assumed that the distribution of Mn and Ba is modified by the water–sediment interaction
in the landslide.