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Geochemical Mapping and Pb distribution in soils developed on Carbonate and Non-carbonate bedrock in Croatia

An update of geochemical mapping of the topsoil cover performed in the two geologically very different environs of the Republic Croatia is given. One is a carbonate bedrock (karst) dominated region (southern Dalmatia) and the other a non-carbonate bedrock dominated region (NW Croatia). Geochemical mapping was performed at a density of 1 sample per 25 km2. In comparison with the non-carbonate terrains, the carbonate terrains have higher mean concentrations of Al, As, Co, Cu, Fe, La, Mn, Pb, Ni, Mn, Th, V, Cr, Zn, Zr and Nb, similar contents of Sr, P and Ti, whereas K, Na, Mg and Ba are lower in carbonate terrains. Approximately 4% of the sites can be considered as moderately enriched (polluted) in Pb, either directly from mining activities or by airborne deposition. Only a limited number of sampling sites can be directly linked with mineralization. It was found that differences in soil chemistry between the karst (Dinaric) regions and the Pannonian region are not only expressed only by concentration differences but also by element associations.

Geochemical baseline mapping; soils; environmental geochemistry; heavy metals; pollution; karst; carbonate and non-carbonate bedrock; Croatia.

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