The subduction-related calc-alkaline magmatic complexes of the Matra and the Borzsony Mts contain significant Pb-Zn ore deposits. Earlier studies on the trace element and isotope geochemistry of the volcanic rocks indicated crustal contamination of the original magmas that also appears in the host rock δ34S data (ranging from +0.9‰ to +5.6‰). Most of the sulfide minerals studied (galena, sphalerite, chalcopyrite, pyrite) reflect these magmatic compositions. However, in veins formed close to sedimentary country rocks significant δ34S deviations occur. The presence of both very negative (to -20.7‰) and positive (to +18.1‰) compositions indicate mobilization of biogenic sulfide and seawater-derived sulfate. An attempt was made to apply the data for geothermometric purposes. However, most of the data show disequilibrium fractionations that can be related to the combined effects of contamination and closed-system mineral precipitation.
|Number of pages||14|
|Journal||Acta Geologica Hungarica|
|Publication status||Published - Dec 1 1999|
- Calcalkaline volcanic rocks
- Pb-Zn ore deposits
- Stable sulfur isotope composition
ASJC Scopus subject areas