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A Watershed-Scale Approach to Tracing Metal Contamination in the Environment - Figure 2

Figure 2. Plot of the ²⁰⁶Pb /²⁰⁴Pb data from sediment samples collected from the drowned channel of the Mokelumne River in the Camanche Reservoir plotted as a function of distance beginning upstream of the Penn Mine. For each of the sediment samples, the portion of the labile Pb from the Penn Mine is calculated using equation 1. The average Pb-isotopic composition of the background materials (open squares) is shown by the dashed horizontal line, and the Pb-isotopic composition of ore from the Penn Mine is shown by the solid triangles (from Church et al., 1997).

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