Traces of bloomery iron production are known from 150 archaeological sites in the lowland Drava River valley, NW Croatia. Excavated workspaces are dated to Late Antiquity and the Early Middle Ages (4th/5th – 8th/9th century). The sites can be referred to as iron production environments. These include workspaces with traces of iron production activities and adjoining areas with natural preconditions for the development of bog iron ores. The study analyses topsoil properties of one of these environments with the objective to define and distinguish pedogenic markers related to bog iron ore formation and deposits from anthropogenic activity markers related to iron production. This is achieved through comprehensive analysis of 67 topsoil samples set within a regular square grid in the research area. The samples are characterized by mineralogical (XRD), geochemical (pXRF), granulometric, and soil pH analysis. Multivariate statistical and spatial analyses are used to understand influences on the topsoil properties. The analysis shows: (1) the spatial delineation of bog iron ore occurrence and iron production site, (2) primary (Fe, As, P, Mn, Ba, Th and goethite) and secondary (Ni, Cu, Zn, Hg, Pb) markers associated with the bog iron ore occurrence, (3) a positive trend in the representation of primary markers, associated with development potential of bog iron ores at different micro-locations, (4) markers for iron production sites related to ferrous slag (Fe, Pb, Zn), technical ceramics and wood ash/charcoal (P, Ca, K, Mg, Sr, Zn, Pb and calcite, amphibole minerals), (5) long-term influence on topsoil pH above archaeological record.
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