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Natural Resources Canada > Earth Sciences Sector > Priorities (2002-2006) > Northern resources development > Western Churchill Metallogeny Project
Western Churchill Metallogeny Project U-Pb SHRIMP analyses of zircons from Paleoproterozoic granites: probing the Hearne crust indirectly
Otto van Breeman
Four Nueltin suite samples and twenty Hudson suite samples that were analysed by U-Pb SHRIMP techniques show that intrusion of the Hudson suite lasted ca. 50 Ma, from 1845 Ma to 1795 Ma, with a peak around 1825 Ma and the Nueltin suite from 1765-1750 Ma following a ca. 30 million period of magmatic quiescence. Whole rock Nd isotopic measurements, with average Nd near -10, indicate a dominant late Archean crustal component in both suites of Proterozoic granites, reflected by numerous inherited zircon ages between 2720 Ma and 2650 Ma in Hudson granites but along the Manitoba border, inherited zircons of 3500 Ma to 3000 Ma age, together with previously published U-Pb data on gneisses, and ca. 3 Ga TDM model ages of Hudson granites, indicate the presence of middle to early Archean crust.
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