Abstract
Although Sm-Nd isotopic analyses of volcanics from Kambalda, Western Australia, form a 3.2 Ga linear array, Pb−Pb analyses of the same suite give an isochron age of 2.73±0.03 Ga and a 2.7 Ga model age for the associated sulphides. We suggest that the 3.2 Ga age is incorrect and that the Sm-Nd array results from mixing between depleted mantle and either older continental crust or enriched mantle.
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