Provenance variability along the Early Ordovician north Gondwana margin: Paleogeographic and tectonic implications of U-Pb detrital zircon ages from the Armorican Quartzite of the Iberian Variscan belt

1. Shaw, J.
2. Gutiérrez-Alonso, G.
3. Johnston, S.T.
4. Pastor Galán, D.