U-Pb geochronology and Sm-Nd isotopic composition of Proterozoic gneisses, Channel Islands, UK

From: Journal of the Geological Society | Date: July 1, 1998| Author: | Copyright information

SCOTT D. SAMSON1 & RICHARD S. D'LEMOS2

Abstract: Gneissic units of the Channel Islands, United Kingdom. have traditionally been considered to be Palaeoproterozoic basement to the late Neoproterozoic Cadomia terrane, based on lithological correlations and imprecise or ambiguous isotopic data. A new precise U-Pb date of 2061 +/- 2 Ma, based on analyses of single zircons, for the Icart granitic orthogneiss of Guernsey confirms a Palaeoproterozoic age of its igneous protolith. The Nd depleted mantle model age (T^sub DM^) of this gneiss is 2220 Ma. only slightly older than its crystallization ...

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