Deutsch: Gruf-Komplex Français: Complexe du (Monte) Gruf Italiano: Complesso del (Monte) Gruf English: Gruf Complex
The Gruf Complex is a polymetamorphic migmatitic unit of the Eastern Lepontic (Ticino Culmination), interpreted as a lower crust compartment (possibly related to the Adula Nappe) that was dragged up by the rise of the Bregaglia Intrusion. It directly underlies the Tambo Nappe and the ophiolitic Chiavenna Nappe to the north along a steeply N-dipping fault and follows the base of the Bregaglia Intrusion to the south.
Gruf migmatite complex (Gulson 1973), Gruf-Masse (Schmutz 1976), Bodengo-Gruf Unit (Berger & Mercolli 2007), Gruf complex (Galli et al. 2013)
Deutsch: Internes Penninikum der Zentral- und Ostschweiz Français: Pennique Interne de Suisse centrale et orientale Italiano: Pennidico Interno della Svizzera centrale e orientale English: Internal Penninic of Central and Eastern Switzerland
In Central and Eastern Switzerland, the internal part of the Penninic domain is restricted to the Simplon-Ticino region and to Graubünden (incl. Lower Engadine Window) with some prolongation in the Italian valleys of San Giacomo and Malenco. East of the Rhine, both external and internal Penninic units are present in the Vorarlberg (Austria) and converge eastward in the Allgäu (Germany) at the eastern end of the Helvetic domain.
Penninic in central and eastern Switzerland (TK500 / Gouffon et al. 2024)
Deutsch: Canavese-Störung Français: Faille du Canavese Italiano: Faglia del Canavese (s.s. = esterna) English: Canavese Fault
Discontinuité tectonique cassante développée au bord septentrional (= externe) de la zone du Canavese s.s. Elle sépare cette dernière de la zone de Sesia. En direction du nord-est, la zone du Canavese se pince et la ligne du Canavese rejoint alors la terminaison sud-occidentale de la ligne insubrienne entre la zone d'Ivrée à métamorphisme granulitique anté-alpin et la nappe de Sesia à métamorphisme éclogitique alpin.
Canavese (Italia)
--- (Novarese 1929), South Canavese Line (Boriani & Sacchi 1974), Ligne du Canavese (Steck & Tièche 1976), External Canavese Line = ECL (Biino & Compagnoni 1989), linea del Canavese (Dal Piaz et al. 1992a), External Canavese Line = ligne Externe du Canavèse (Borghi et al. 1996), external Canavese line = ECL = Canavese line s.s. (Ferrando et al. 2004), Canavese Fault = Canavese-Störung = Faille du Canavese (TK500 / Gouffon et al. 2024)
Deutsch: (Internes) Mittelpenninikum der Westschweiz Français: Pennique Moyen (interne) de Suisse occidentale Italiano: Pennidico Medio (interno) della Svizzera occidentale English: (Internal) Middle Penninic of Western Switzerland
In Western Switzerland, the Middle Penninic subdomain comprises units located between the Sion-Courmayeur Nappe and the Tsaté and Zermatt-Saas nappes. These units were first grouped together within the “Grand St-Bernard Nappe” (Argand 1911), which was then subdivided into several nappes.
The Middle Penninic units are thought to be derived from the Briançonnais Terrane, which consisted of a polycyclic crystalline basement cut by Late Cambrian (ca. 500 Ma) and Permian (ca. 270 Ma) granitic intrusions, Permo-Carboniferous sediments that filled narrow basins and a characteristic Mesozoic – Paleogene sedimentary cover. Much of this Briançonnais cover was detached at the level of the Triassic evaporites to form some of the nappes in the Prealps.
Middle Penninic in Western Switzerland (TK500 / Gouffon et al. 2024)
Cephalopodenbank (Arn. Heim 1916), Ammonitenhorizont an der Basis des Valanginienkalkes (Haus 1937 in: Rutsch et al. 1966), Büls-Schichten (Kuhn 1997), Büls Beds = Büls Member (Föllmi et al. 2007)
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