Fig. 1

a Simplified geological overview of the arc of the western Alps (A Argentera massif, CM Combeynot massif, MB Mont Blanc massif, P Pelvoux massif, R Rhone-Simplon line, T Tonale line); after Ferreiro Mählmann (1996), Ceriani et al. (2001) and Ravenne et al. (1987, 2004). b Tectonic map along the eastern rim of the Pelvoux massif compiled from (1) geological maps BRGM (1/50,000): La Grave, Briançon, St Christophe en Oisans, Guillestre, Orcières and Embrun and (2) Tricart (1986). Points Yr, Fo, Be, Cha, Do and DoF refer to samples studied, collected at the eastern rim of the Pelvoux massif, in the Yret, Fournel, Beassac, Chambran, Dormillouse and Dormillouse-Fangeas valleys, respectively. RT Roselend Thrust, RYSZ Rocher de l’Yret shear zone