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This is especially true for some of the Irish (e.g., Navan) and Alpine (e.g., Bleiberg; Schroll, 1997) examples. One neglected aspect in the study of carbonate-hosted Pb-Zn deposits is the role of microbial processes in their formation, a topic that started to attract the general interest of economic geologists only recently (e.g., Southam and Saunders, 2005). Most evidence for the involvement of microorganisms in the formation of carbonate-hosted Pb-Zn deposits is based on sulfur isotopes. Strongly negative sulfur isotope compositions of sulfides are commonly regarded as evidence for BSR (e.g., Fallick et al., 2001; Bawden et al., 2003). Microtextural evidence for the involvement of bacteria in the mineralization process is rare. Sulfide microglobules interpreted as biogenic peloids have, however, been reported from carbonate-hosted Pb-Zn deposits in Ireland (Kucha, 1988; Kucha et al., 1990) and the Upper Silesian MVT deposits in Poland and Belgium (Kucha and Viaene, 1993). In this study we present nano-to macrotextural and sulfur isotope evidence supporting the hypothesis that microorganisms

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