Uranium-lead isotopic evidence from zirc
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R. A. Cliff
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Article
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1980
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Springer
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English
β 776 KB
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,