strati.ch - Lessico lithostratigrafico della Svizzera

Rappresentazione e statuto

Varianti storiche: anticlinal de Verampio (Argand 1911b carte et planches), Verampiodecke (Grütter 1929), cupola di Verampio (Toce) (Hermann 1937), Fenster von Verampio (Wieland 1966), zone de Verampio (Escher et al. 1987), cupola di Verampio = elemento zero (Dal Piaz et al. 1992a), nappe n°0 (Carrupt 2003), Verampio unit = Verampio nappe = Verampio fold nappe (Steck et al. 2013), Verampio Nappe (TK500 / Gouffon et al. 2024)

Descrizione: Steck et al. 2013, p.429: "The Verampio and Leventina units are the deepest units of the Alpine nappe stack, exposed in the Toce and Ticino dome structures (Figs. 2, 3; Table 1). The deep seismic study (Swiss National Foundation Project no. 20, Steck et al. 1997; Steck 2008) confirmed the thrust sheet geometry of the Verampio nappe, itself separated by an unnamed nappe (X-nappe on cross-section 3, Fig. 3) from the root of the northern Gotthard fold nappe. The Verampio fold nappe is composed of the 291 ± 4 Ma old Verampio granite (U–Pb zircon age, François Bussy in Steck et al. 2001) intrusive in Paleozoic meta-greywackes (Baceno schists) and separated from the higher Antigorio fold nappe by a syncline of autochthonous Mesozoic sediments, the Teggiolo zone (Steck et al. 1999, 2001)."

Estensione geografica: Lepontin (Toce-Dom) [kommt nur auf GA25-Blatt XXX_Helsenhorn vor].

Termini generici

Tipo di origine

Definizione: Argand Emile (1911) : Les nappes de recouvrement des Alpes Pennines et leurs prolongements structuraux. Mat. Carte géol. Suisse (N.F.) 31/1, 30 pages

Revisione: Gouffon Yves (Editor) (2024) : Tectonic Map of Switzerland 1:500000, Explanatory notes. Federal Office of Topography swisstopo, Wabern

p.47: The Verampio Nappe is the lowest unit of the Toce Culmination. It appears as a window in the Valle Antigorio. This nappe consists of a paragneiss basement intruded by a Variscan granite (289 ± 3 Ma, Bergomi et al. 2007) and overlain by a thin Mesozoic sedimentary cover. The same Mesozoic series occupies the reverse limb of the overlying Antigorio Nappe. Steck et al. (2001) suggest the contact between these two nappes is a thrust isoclinal recumbent syncline.