Abstract

The 206Pb/204Pb ratios of fine-grained fractions from glacial tills indicate the presence of known Proterozoic volcanogenic massive sulfide deposits at Chisel Lake, near Snow Lake, Manitoba, Canada. Data from <2 μm and other size fractions define a linear array on a 207Pb/204Pb vs. 206Pb/204Pb diagram, with a slope that yields an age similar to the age of the deposits and the surrounding country rocks. Some of the least radiogenic till samples were found down ice from the deposits, suggesting that the Pb isotopic compositions from till may provide a new approach to mineral exploration for massive sulfide deposits in glaciated terrains.

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