Fig. 2

Late Cretaceous and Tertiary structures and metamorphism of the Central and Western Alps, modified after Frey et al. (1999), Steck et al. (2001, 2013) and Oberhänsli (2004) with locations of the structural map of the Monte Rosa region (Fig. 3) and geological Zweisimmen-Monte Rosa section (Fig. 4), 1, (green): Late Eocene-Miocene greenschist facies metamorphism, 2, (yellow): Late Eocene–Oligocene 40–28 Ma amphibolite facies metamorphism, 3, (magenta red): Mantle derived 32–29 Ma (Adamello 42–29 Ma) dioritic magmatism, 4, (violet): Late Cretaceous-Early Paleocene 90–60 Ma eclogite facies metamorphism of the Sesia zone, 5, (blue–violet): Eocene 50–38 Ma eclogite facies metamorphism of the Middle and Upper Penninic nappes, 6, (blue): Late Eocene eclogite facies metamorphism of the Adula nappe