Published in
Elsevier, Earth and Planetary Science Letters, 4(74), p. 315-324
DOI: 10.1016/s0012-821x(85)80003-0
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The Sm-Nd age of Kambalda volcanics is 500 Ma too old!
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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.