Abstract
U-Pb zircon studies have shown that the early Archaean Uivak gneisses of northern Labrador were affected by granulite facies metamorphism between 2.7 and 2.8 Ga ago, when the rocks were already close to a billion years old. At least three subtypes of granulite facies reworked Uivak gneiss have been recognized; together with field observations their isotopic and geochemical characteristics suggest a series of processes during different stages of which the whole rock isotopic systems responded differently.
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