Stefan M. Schmid. 84th CONVENTION 2017 Ascona, Switzerland, Monte Verità, June 17 19, 2017
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1 On the "root zone" of the Alpine nappes in the Ticino area (Ivrea Zone, Insubric line and gneisses of the Southern Steep Belt): Geometry and kinematics Stefan M. Schmid 84th CONVENTION 2017 Ascona, Switzerland, Monte Verità, June 17 19, 2017 S N S N Livo gorge near Lake Como View from Losone towards Arcegno
2 OROGEN-SCALE
3 The Insubric line; part of the Periadriatic line Main activity of the Insubric Line: Ma. The eastern segments (Pustertal- Gailtal- and Balaton-lines) are also active after 20 Ma, when the Periadriatic line became offset by the Giudiarie line the Eastern Alps Austroalpine Southern Alps 200 km
4 Estimate of the amount of dextral strike slip estimate of the amount of dextral strike slip, based on the reconstruction of the movement of the Ivrea mantle wedge (green) for the last 35 Ma: 140 km reconstruction for the last 45 Ma after Schmid et al. (2017), Europe fixed 0 Ma 25 Ma 103 km 35 Ma 45 Ma 140 km Schmid et al. 2017
5 Estimate of backthrusting along the Insubric Line 22 km Schmid et al. 2004
6 Large amounts of exhumation by retro-thrusting and Subsequent erosion restricted to the Lepontine dome Oberhänsli et al. 2004
7 The Lepontine dome in map view Gotthard nappe limit amphibolite grade Simano & Leventina- Lucomagno Zermatt- Saas Fee M. Rosa Bellinzona- Dascio Schmid et al. 2017
8 The Lepontine dome in profile view Schmid et al. 2017
9 Passive margin formation exhumed Ivrea zone Ticino & Lombardian S. Alps Ivrea Zone Schmid et al S. Alps preserve a passive margin Age of peak-t: Permian!!!! Granulite facies mafics Granulite facies metapelites
10 LOCAL GEOLOGY, OUTCROPS, THIN SECTIONS
11 Canavese Line (eastern branch of Insubric line) in Valle d Ossola SE NW SE NW Ivrea Zone Sesia Zone SOUTHERN ALPS CENTRAL ALPS NW SE CENTRAL ALPS SOUTHERN ALPS Zingg et al. 1990
12 Insubric line near Ascona S N
13 S Ivrea Zone Ivrea-derived mylonites Canavese Mesozoic Sesia-derived mylonites Sesia Zone P.-L. Ocean Zerm.-Saas Zone Monte Rosa nappe N Arcegno 2 km Losone
14 backthrusting and strike slip displacements down-dip lineations = back-thrusting subhorizontal lineations = strike slip The northern part of the mylonite belt records steep lineations, indicating backthrusting. The southern part of the mylonite belt records subhorizontal lineations, Indicating dextral strike slip Schmid et al & 1989
15 Fault rocks at the Insubric line 1 mafic rocks Ivrea Zone paragneisses Ivrea Zone cataclasite pre-alpine fabric pseudotachylite Ivrea-derived mylonite
16 Fault rocks at the Insubric line 2 mylonitized Mesozoic limestone Sesia-derived mylonites lineations sigma clasts sheath fold
17 tectonic map of the Arcecno area and excursion day 2 Grotto Zelinda 8$ 7$ 6$ 1 5$ 3$ our hotel 4$ 2 unpublished
18 southern part of the Lepontine dome Simano (490Ma granite gneiss) Cima Lunga (Adula) Maggia (Cocco gneiss) Lavertezzo Maggia Maggia (Vogorno) Belinzona-Dascio zone (Valaisan?) Onsermone zone (Antigorio) Belinzona-Dascio zone Zerm.-Saas Fee Monte Rosa Sesia Insubric mylonites Ivrea Strona Ceneri Berger & Merolli 2005
19 foliations and lineations lineations foliations mostly Eduard Wenk unpublished compiled by S. Schmid
20 foliations, lineations & tectonic map
21 Profile across the southernmost Lepontine dome Bellinzona- Dascio Zone Simano nappe 2. stop 1. stop Insubric line Geology of Switzerland Guide Book 1980
22 Polyphase folding in the Lepontine dome at Lavertezzo
23
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