Cryptic Early-to-Main rift-related Cambrian magmatism in the Central Iberian and Galiza-Trás-os-Montes zones (Iberian Massif) revealed by U-Pb dating of inherited zir

Abstract

The Early Palaeozoic rift-related igneous activity recorded in the Iberian Massif is subdivisable into three main events separated by relatively quiescent episodes. The so-called Early, Main and late events represent space-temporal diachronic pulses characterized by a progressive variation in the nature of the rift-related magmatism. The first two, Early and Main rift-magmatic events, were defined in detail by Sánchez García et al. (2003) and are almost exclusive of the Ossa-Morena Zone (OMZ), while the late magmatic event mainly occurs in the Central Iberian (CIZ) and Galiza-Trás-os-Montes (GTMZ) zones (Ollo de Sapo Formation and associated plutons).