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- W2112509155 abstract "Pb-isotope ratios from galenas and Ni-arsenides of the Midwest deposit indicate that there are three classes of Pb present. The first, with 206 Pb/ 204 Pb ratios of about 22.5 and 208 Pb/ 204 Pb ratios of about 43.5, occurs only in galenas and is restricted to the basal Athabasca Formation. The second occurs from about 35 m above the unconformity to the deepest samples available to us (60 m into the basement rocks). Characteristically the 206 Pb/ 204 Pb ratios are 30–35 and the 208 Pb/ 204 Pb ratios are about 50, and this Pb occurs in both galenas and Ni-arsenides. The third class has elevated 206 Pb/ 204 Pb ratios ranging up to 350 and occurs within about 10 m of the unconformity in close association with U minerals.A model is developed in which radiogenic additions to galena have occurred during at least two different events. The first added U and Th daughters to sandstone-type Pb at 265 ± 50 Ma, and the second added U daughter only to the basement-type Pb in the past 50 Ma or less. These events are consistent with Pb loss recorded in the U minerals and indicate that the lead-loss mechanism from these U minerals is catastrophic rather than continuous diffusion.Some trace Pb isotopic compositions in Ni-arsenides suggest to us the occurrence of disequilibrium migration of 238 U daughter products, but there is no clear evidence that this occurred on a macroscopic scale in the galena.The model implies that some galena predates the U mineralization, and thus that there is a potential for Pb–(Zn?) mineralization in the basal Athabasca Formation." @default.
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- W2112509155 date "1984-06-01" @default.
- W2112509155 modified "2023-09-23" @default.
- W2112509155 title "Isotopic composition of lead in galena and Ni-arsenides of the Midwest deposit, northern Saskatchewan" @default.
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- W2112509155 doi "https://doi.org/10.1139/e84-071" @default.
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