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1 Department of Geology and Geophysics, University of Wisconsin, 1215 West Dayton Street, Madison, Wisconsin 53706, USA
In this study we contrast insights on Precambrian crustal growth and maturation from radiogenic and oxygen isotope systematics in the Superior (3.0–2.7 Ga) and Grenville (1.3–1.0 Ga) Provinces of the Canadian shield. Oxygen isotope ratios in zircon provide the best evidence of supracrustal input into ancient orogens. Archean Superior Province zircons have relatively low 
18O values and a limited range (5.7
± 0.6), while Proterozoic Grenville Province zircons have elevated 18O values and a wider range (8.2 ± 1.7). These data reflect fundamental differences in crustal evolution and maturation between the Superior and the Grenville Provinces. In the Grenville Province, radiogenically juvenile supracrustal material with high 18O values was buried (or subducted) to the base of the crust within 150 m.y. of initial crust production, causing high magmatic 18O values (18O [zircon] 
8) in anorthosite suite and subsequent plutons. Information about large volumes and rapid recycling of Grenville crust is not accessible from radiogenic isotope data alone. The Grenville data contrast with the restricted 18O values of Superior Province magmatism, where subtle (
1) elevation in 18O occurs only in volumetrically minor, late to postorogenic (sanukitoid) plutons. Differences in sediment 18O values between the Superior and Grenville Provinces are predominantly a function of the 18O of source materials, rather than differences in chemical maturity or erosion styles. This study shows that zircon is a robust reference mineral to compare igneous processes in rocks that have undergone radically different histories.
Key Words: oxygen isotopes • zircon • Precambrian • crustal growth • Superior Province • Grenville Province
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