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Geochemical comparison of stream and overbank sediments : a case study from Žumberak region, Croatia

A geochemical survey of the Žumberak region was carried out within the scope of the research project labelled “Basic geochemical map of Croatia – carbonate terrains”. The purpose of this research was to narrow the focus of investigation to an appropriate sample medium that is area-related, with greater prospects of reflecting the surface lithology as well as traces of possible mineralization and pollution. Discriminant analysis was chosen as a simple strategy to sequester one of the two types of sample material – stream sediment or overbank sediment - as more informative on the basis of their geochemical composition. Geochemical comparison between the low- to medium-order stream and overbank sediments was thus grounded on the presupposed statistical contradistinction between the locality-paired sample correlates. Results of discrimination prefer the overbank material mainly on account of its higher natural geochemical variability vis-a-vis otherwise common geochemical semblance. Investigations also demonstrated that in the relatively non-contaminated area it may not be easy to verify the supposed purity-contamination reciprocity between the investigated media since the recent and prehistoric materials were not contrasted as regards their non-lithogene components.

geochemical mapping; drainage basin approach; stream sediment; overbank sediment; discriminant analysis; Žumberak; Croatia

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