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Deutsch: Lago-Maggiore-Störung
Français: Faille du Lago Maggiore
Italiano: Faglia del Lago Maggiore
English: Lago Maggiore Fault

The Lago Maggiore Fault marks the boundary between the Ivrea-Ceneri Complex and the Upper Orobic Nappe. It was originally an Early Mesozoic rift fault that separated the Early Jurassic Monte Nudo Basin in the east from the Gozzano High in the west.

Lago Maggiore

Lago Maggiore Fault (TK500 / Gouffon et al. 2024)

Deutsch: Val-Colla-Störung
Français: Faille du Val Colla
Italiano: Faglia della Val Colla
English: Val Colla Fault

The Late Variscan Val Colla Fault is a mylonitic fault zone separating the Strona-Ceneri and Val Colla zones and sealed at M. Caslano, west of Lugano, by unconformably overlying Permian volcanics. In the northeast, the Val Colla Fault is cut by Alpine faults and interrupted by the Tonale Fault.

Val Colla Fault (TK500 / Gouffon et al. 2024)

Deutsch: Val-Colla-Zone
Français: Zone du Val Colla
Italiano: Zona della Val Colla
English: Val Colla Zone

The Val Colla Zone is a Variscan tectonic unit representing, together with part of the Strona-Ceneri Zone, the basement of the Upper Orobic Nappe. It consists mainly of paragneisses, hornblende-epidote schists and metagranites. These Variscan, originally amphibolite-facies metamorphic rocks, were retrogressed to the greenschist facies, possibly during Mesozoic rifting and associated exhumation of the basement rocks.

Val Colla (TI)

Val-Colla-Zone = Val-Colla-Decke (Reinhard 1954), Val Colla-Zone (Rutsch et al. 1966), Zona Val Colla (Boriani et al. 1990), Zona della Val Colla (Dal Piaz et al. 1992a), Val Colla Zone (Berger & Mercolli 2007)

Deutsch: Canavese-Zone
Français: Zone du Canavese
Italiano: Zona del Canavese
English: Canavese Zone

The intensely mylonitized Canavese Zone consists of individual slivers of basement and Mesozoic sedimentary cover rocks trapped along the Internal and the External Canavese faults between the Ivrea-Ceneri Complex in the southeast and the Sesia Nappe in the northwest, dismembered by Alpine shear zones and brittle faults. It extends from the area west of Ivrea to Locarno where it is truncated by a fault that links the Centovalli Fault to the Tonale Fault. It includes migmatitic and leucogranitic basement rocks with inclusions of mafic granulites similar to those of the Ivrea Zone, and amphibolite-facies basement rocks with granitic intrusions similar to those of the Strona-Ceneri Zone. The Mesozoic sedimentary cover can be compared to that of the Lower Austroalpine Err Nappe Complex in Graubünden and is interpreted as part of the distal Adriatic margin.

Canavese (Italia), N Ivrea / Piemonte

zone du Canavese (Argand 1909a/b, Argand 1911b), zone du Canavèse [sic] (Henny 1918, Debelmas 1976), Elemento tectonico del Canavese (Hermann 1937), Zone des Canavese (Walter 1950, Kobe 1956), Roches du Canavese (Steck & Tièches 1976), Canavese Zone (Zingg et al. 1976, Biino & Compagnoni 1989, Borghi et al. 1996, Berger & Mercolli 2007), geosinclinale del Canavese = Zona del Canavese (Dal Piaz et al. 1992a), Canavese unit = Canavese metasediments (Babist et al. 2006), zone du Canavais [traduction littérale], Canavese Zone = Canavese-Zone = Zone du Canavese (TK500 / Gouffon et al. 2024)

Deutsch: Südalpin
Français: Sudalpin
Italiano: Sudalpino
English: Southalpine

The South Alpine tectonic domain exposes a complete section of the Adriatic continental crust from ultramafic (slices of uppermost continental mantle lithosphere), mafic and felsic granulite-facies rocks (lower continental crust: Ivrea Zone) through medium- and low-grade basement rocks (middle–upper continental crust: Strona-Ceneri and Val Colla zones, basement of the Orobic units) to unconformably overlying non-metamorphic Late Carboniferous sediments that were involved in post-Variscan folding.

The detached Variscan continental crust and its overlying Permian to Miocene sedimentary cover form a fold-and-thrust belt, the southern S-vergent back-chain of the Alps, separated from the other domains of the Western and Central Alps to the west by the Canavese Fault and to the north by the Tonale Fault. Both faults are part of an Oligocene–Miocene post-collisional system of transpressive transfer faults along the northwestern boundary of the Adriatic indenter.

Southalpine, Alpi meridionali lombarde (Godenzi 1963), Southern Alps = Alpi meridionali (Dal Piaz et al. 1973), Südalpen (Trümpy 1974), Sudalpino = Alpi meridionali (Sciesa 1991), Alpi Meridionali = Sudalpino (Dal Piaz et al. 1992a), Südalpin (Spillmann 1993)