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- External_massif abstract "An external massif is, in the geology of the Alps, a place where crystalline rocks of the European plate crop out. Such massifs are found north and west of the Penninic zone (the crystalline "core" of the Alps) as tectonic windows in the Helvetic Zone. They differ from the crystalline nappes in that they were originally part of the European plate, while the Penninic nappes were part of the crust below various domains in the Tethys Ocean.The external massifs are the Argentera in the Alpes Maritimes, the Pelvoux massif and the Belledonne in the Savoyan part of the French Alps, the Mont Blanc Massif at the borders between France, Italy and Switzerland and the Aarmassif and Gotthardmassif in the Central Alps of Switzerland.The massifs are composed of the basement of the former margin of the European plate, consisting of metamorphic and igneous rocks of Hercynian age or older. The Mesozoic cover that was originally on top of these rock has mostly been detached by thin skinned thrusting about 40 to 25 million years ago (Ma). At some places along the Aarmassif, the Mesozoic cover is partly still lying conformally on top of the Hercynian basement rock, this Mesozoic is called the Infrahelvetic complex. The uplift that brought the massifs to the surface involved thick skinned thrusting (the style of thrusting in which the basement is itself involved) and took place in a tectonic phase beginning around 19 million years ago.".
- External_massif thumbnail External_crystalline_massifs_of_the_Alps.png?width=300.
- External_massif wikiPageID "24703106".
- External_massif wikiPageRevisionID "545749710".
- External_massif hasPhotoCollection External_massif.
- External_massif subject Category:Geology_of_the_Alps.
- External_massif comment "An external massif is, in the geology of the Alps, a place where crystalline rocks of the European plate crop out. Such massifs are found north and west of the Penninic zone (the crystalline "core" of the Alps) as tectonic windows in the Helvetic Zone.".
- External_massif label "External massif".
- External_massif label "Massifs cristallins externes".
- External_massif sameAs Massifs_cristallins_externes.
- External_massif sameAs m.080nyrz.
- External_massif sameAs Q3297714.
- External_massif sameAs Q3297714.
- External_massif wasDerivedFrom External_massif?oldid=545749710.
- External_massif depiction External_crystalline_massifs_of_the_Alps.png.
- External_massif isPrimaryTopicOf External_massif.