Crustal sources in lower palaeozoic rocks from NW Iberia: Insights from laser ablation U-Pb ages of detrital zircons

From: Journal of the Geological Society | Date: November 1, 1999| Author: | Copyright information

Detrital zircons from greywackes belonging to an Ordovician volcanosedimentary-igneous complex in NW Spain were dated using the laser ablationinductively coupled plasma-mass spectrometry

technique. U-Pb results indicate the existence of three Precambrian crustal sources in NW Iberia. The age grouping dated at c. 590-620 Ma confirms the presence of a CadomianAvalonian basement in this zone. The second age group (c. 1.11.2 Ga) is the first evidence for a Grenvillean age crustal component in NW Iberia. The age grouping dated at c. 1.92.0 Ga corresponds to the age of the Icartian igneous ...

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