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Fig. 3 | Swiss Journal of Geosciences

Fig. 3

From: Alpine peak pressure and tectono-metamorphic history of the Monte Rosa nappe: evidence from the cirque du Véraz, upper Ayas valley, Italy

Fig. 3

Mesoscopic aspect of some key lithologies belonging to the Monte Rosa nappe: a layered gneiss with quartz and biotite rich bands, and younger cross-cutting aplitic dyke. b Metamorphic assemblages: (i) large Grt formed during high temperature-low P Variscan metamorphism, and (ii) Wm + Ctd + St indicating peak conditions during the Alpine high P event. c Migmatitic textures of basement lithologies in close proximity to granitic intrusion indicating partial melting due to the intrusion of the Monte Rosa granite. d Wm + Ctd + St pseudomorphs after former contact metamorphic andalusite formed during the peak Alpine high P event. e Complexly folded mafic boudins in a matrix of coarse-grained Plg + Qz volcanoclastic metasediments belonging to the Furgg zone series. f Metamorphic assemblages: (i) large Grt formed during Variscan regional metamorphism, and (ii) Wm + Ctd + St belonging to peak Alpine high P event

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