Uranium-lead isotopic evidence from zircons for lower Palaeozoic tectonic activity in the Austroalpine Nappe,the Eastern Alps |
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Authors: | R. A. Cliff |
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Affiliation: | 1. Department of Earth Sciences, University of Leeds, LS2 9JT, Leeds, England
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Abstract: | U/Pb isotopic data for two zircon suites are presented: - a pre D 1 tonalite gneiss gives an age of 443 ± 16 13 m.y.
- a post D 1 leucogranite gneiss gives 427 ± 11 10 m.y.
Both zircon suites contain a minor inherited pre-Cambrian component. The data confirm a lower Palaeozoic age for the major, fabric-forming D 1 event. Hercynian metamorphism which was sufficient to reset muscovite K/Ar ages to ca. 290 m.y. had little effect on the zircons. The possible importance of lower Palaeozoic orogeny in southern Europe and the uncertainties in regional palaeogeography are emphasised. |
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