Abstract
A study of the geochemical behaviour of zirconium (Zr) and afnium (Hf) in several Bulgarian coal deposits has shown that the content of these elements varies considerably, the highest concentrations being found in fragments of coalified woods included in sandstones. Zr and Hf content of the lithotypes of the coals is lower than that of the corresponding whole coal samples. The Zr Hf ratio for xylain and vitrain is always lower than that for whole coal samples. Zr and Hf are mainly associated with the inorganic matter of the coals and Zr org and Hf org dominate only in the low ash coals of some deposits. It is assumed that Zr org and Hf org were leached from the terrigenous minerals supplied to the peat swamp and fixed by the organic matter. These processes result in a slight separation of both elements.
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