Abstract
The specific features of the chemical composition, isomorphism, and zoning have been studied for pyrochlore supergroup minerals (PSM) from metasomatic rocks of ore occurrence no. 9 (Nezilovo, Pelagonian Massif, Republic of Macedonia). Ore occurrence no. 9 has an unusual nonsulfide association of chalcophile elements: Zn, As, Sb and Pb. Pyrochlore supergroup minerals crystallized at all stages of metasomatism. Zoning of pyrochlore supergroup minerals and their relationships with associated minerals (Zn-bearing silicates, tilasite, barite, carbonates, various accessory Pb-, Sb- and Zn-oxides, etc.) suggest a complex geochemical evolution of ore occurrence no. 9. The possible mechanism for the formation of nonsulfide parageneses of chalcophile elements is discussed.
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