FÁZOVÉ SLOŽENÍ STŘEDOVĚKÝCH STRUSEK PO TAVBĚ Pb-Ag RUD Z HUTNICKÉHO AREÁLU PLANDRY U JIHLAVY Phase composition of Medieval slags after smelting of Pb-Ag ores from the metallurgical complex Plandry near Jihlava

Abstract

Slags aft er silver smelting from the metallurgical site Plandry near Jihlava were examined in order to assess the conditions of smelting and composition of the charge. Samples were studied by a polarizing microscope in transmitted and refl ected light and selected phases were analyzed using electron microprobe. Two diff erent types of slag were specifi ed on the basis of their phase composition. Th e fi rst is made up of glass, olivine, and sulphides. In the second type, olivine and glass predominate and spinelide, K-Ba-feldspar, leucite, and sulphides are present in less quantity. Sulphides are present as droplets formed by the Cu-Fe-S matrix with inclusions of shandite, sphalerite, and an unknown Cu-Pb-S phase. Slag contains also relicts of unmelted quartz and chromspinel. Th e presence of Fe 3+ in newly formed spinelide refl ects at least partially oxic conditions during melting. Th e mesothermal type of ore with gangue formed by quartz, barite, and carbonate of the dolomite-ankerite series was probably processed. Low contents of lead in glass as well as low volume of Pb-Ag-bearing sulphides refl ect good yield of metals of interest (Pb, Ag). Slags represent a potential environmental hazard due to relatively high contents of Zn (up to 6.6 wt. % ZnO in the glass). Uvod Zajmova lokalita spada do jihlavskeho rudniho reviru. Ten je v nejužsim slova smyslu chapan jako uzemi

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