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Lead isotope ratios of galenas from stratabound massive sulfide deposits in upper Precambrian metasediments of the Blue Ridge (BR) geologic province are too radiogenic for their presumed synsedimentary, late Precambrian age. A positive correlation between lead and sulfur isotope ratios in galenas from Ducktown, Tennessee, is interpreted as an original characteristic of the ores, and indicates that the radiogenicity of the lead is not the result of metamorphic processes, but of derivation of lead from U/Pb-enriched elastic sediments. At Ducktown, however, lead and sulfur isotope ratios indicate a component derived from a mafic source, and suggest that rift basin faulting may have controlled mineralization. Lead isotope ratios in Mount Rogers Formation rhyolites and in BR Paleozoic plutons indicate different sources of lead than those contributing

Lead- and sulfur-isotope systematics in some sulfide deposits of the Piedmont and Blue Ridge provinces of the southern Appalachians