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The Dent Blanche nappe
The Dent Blanche nappe: largely composed of gneiss (lien vers arrêt E-10 excu E), a metamorphic granite, and famous Mt Dolin breccias representing the Alpine rift in the southern margin (small triangles on the cross section). Gabbros from the Permian age can also be found, on Mt Colon for example. The Dent Blanche nappe is a continental fragment that detached from the African plate during the formation of the Alps, thus this southern alpine margin is often referred to as the Austroalpine domain.
NB: The following nappes form the Penninic structural domain separated into three distinct regions. The upper part is the remnant of the Alpine ocean, its suture zone, the central part represents the Briançonnais domain, and the lower part the Valais Ocean. South of the western Alps is the Mt Rose Nappe composed of Carboniferous granite absent in the Val d'Hérens. The Gran Paradiso massif belongs to the same zone as the Mont Rose, called internal massifs, and both pertain to the Briançonnais domain (see general map and cross section).
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+41 (0) 27 283 40 00
Place du Clos Lombard 6
1983 Evolène
+41 (0) 27 283 40 00
Place du Clos Lombard 6
1983 Evolène