Detrital Zircon U/Pb ages in synorogenic deposits of the Internal Zones of the Iberian Variscan Massif and their significance in the orogenic evolution

Abstract

The Variscan synorogenic rocks present extensive exposures in the external parts of the Iberian Variscan massif, namely the Cantabrian and South Portuguese Zones. Nevertheless, in the internal part of the chain this type of sedimentary bodies was preserved exclusively in the nucleus of the main synformal structures. A total of 13 samples were gathered for study of the U-Pb ages in sedimentary zircons belonging to the internal part of the Iberian Variscan Massif: 7 samples collected and analyzed in this research are considered together to previous 6 samples analysis results which are now reinterpretedUnidad de Salamanca, Instituto Geológico y Minero de España, EspañaDepartamento de Geología, Universidad de Salamanca, EspañaLaborátorio Nacional de Energia e Geologia, PortugalARC National Key Centre for Geochemical Evolution and Metallogeny of Continents, Macquarie University, Australi