This magmatism is assigned to a volcanic arc context, which we consider as being earlier than the continental intra-plate extensive context of the Cambrian magmatism. Résumé Dans le Haut-Atlas occidental, un important volcanisme a donné des coulées de laves et de pyroclastites andésitiques ...
Four deep zones of underthrust, extrusion and accretion were developed from the south to the north in the Alpine orogeny (Fig. 4; Table 1). 1. 1. Alpine subduction started in the Western Alps with the underthrust of the Sesia zone below the Canavese zone of the Southern Alps (Dal Piaz...
1. Alpine subduction started in the Western Alps with the underthrust of the Sesia zone below the Canavese zone of the Southern Alps (Dal Piaz et al.2001; Babist et al.2007; Handy et al.2010). It is dated by its Late Cretaceous 75–65 Ma high-pressure metamorphism (Duchêne et al.1...
Introduction The Simplon massif and the Lepontine gneiss dome in the Cen- tral Alps represent one of the best studied zones of continental collision, which has been investigated for over a 150 years (e.g. Studer 1851; Gerlach 1869; Schardt 1903; Schmidt & Preiswerk 1905;Argand 1911,...