Metamorphic characteristics in the Eastern part of the Pallaresa massif and their relationships with the Variscan deformation events: Axial Zone of the Pyrenees (NW Andorra)

Abstract

The Pallaresa massif is a large E-W trend antiformal structure which is included in the metamorphic structural units of the Pyrenean Axial Zone. These units are characterized by metamorphism ranges from low to high grade and different generations of folds and pervasive cleavages accompanied by subordinate thrusting. Pre-Caradocian rocks outcropping in the eastern part of Pallaresa massif consists of a monotonous alternation of quartzites and slates with some intercalations of limestone or microconglomerate that mainly shows low metamorphic grade. However, close to the Aston and Hospitalet domes, in the vicinity of some igneous intrusions, the metamorphism may reach high grade conditionsInstituto Geológico y Minero de España, EspañaUniversidad de Oviedo, Españ