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Isotopic evidence from the eastern Canadian shield for geochemical discontinuity in the Proterozoic mantle

โœ Scribed by Ashwal, L. D.; Wooden, J. L.


Book ID
109733001
Publisher
Nature Publishing Group
Year
1983
Tongue
English
Weight
245 KB
Volume
306
Category
Article
ISSN
0028-0836

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U/Pb isotopic data for two zircon suites are presented : (1) a pre D1 tonalite gneiss gives an age of 443 + 13 \_ 16 m.y. (2) a post D1 leucogranite gneiss gives 427+~ ~ m.y. Both zircon suites contain a minor inherited pre-Cambrian component. The data confirm a lower Palaeozoic age for the major,