Stable Isotope Study of Variscan Vein Pb-Zn-Ag Mineralization of the Bohemian Massif

Exploration & Mining Geology, Vol. 1, No. 1, 1992

J.H. BERNARD and K. ZAK, Geological Survey, Prague, Malostranske1 n&n. 19, 118 21 Prague 1, Czechoslovakia

The three traditional types of Variscan vein Pb-Zn-(Ag) mineralization recognized in the Bohemian massif from historic paragenetic studies are confirmed by modern metallogenic studies. Stable C, S, and O isotope data, as well as Pb and Sr isotopic ratios of the deposits, indicate a 4 predominantly crustal origin of the constituents in all three types. Although the data also suggest differences in temperature and pressure of formation, and the oxidation conditions and nature of the hydrothermal fluids, nonetheless they are consistent with prevailing metallogenic classifications of the vein mineralization.