Abstract
Solid-source lead-isotope studies show that, although Dugald River Prospect, Queensland and Broken Hill, New South Wales, are over 800 miles apart, they appear to have been derived from sources very similar in U-Th-Pb relative abundances. However whereas the Broken Hill deposit is uniform in isotopic make-up, some Dugald River samples show small variations. All Dugald River samples differ slightly from the uniform lead at Mount Isa, 60 miles to the southwest, where lead disseminated in the copper host-rock is isotopically indistinguishable from the nearby lead orebody. Confidence limits for these and other available solid-source data are compared with a comparable set of gas-source lead isotope results. Evidence of instrumental bias is seen, emphasising that direct comparison of solid-source data with the “conformable growth curve” is not justified without correction to a common standard.
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