ABSTRACT
Alunites from low-sulphidation type epithermal systems hosted by Miocene intermediate-acidic volcanic rocks of the Tokaj Mountains are mostly K-alunites with minor Ba content. Alunites from high-sulphidation type epithermal systems in the andesitic stratovolcanic structure of Paleogene age in the Velence Mountains have significant Na contents and contain phosphate-bearing analogue (woodhouseite) with REE elements in their cores. S isotope composition of high-sulphidation alunites of the Velence Mountains is significantly enriched in 34S, compatible with their magmatic-hydrothermal origin and in contrast to the composition of steam-heated alunites from the Tokaj Mountains.
