Falda del Lebendun
Rappresentazione e statuto
- Colore CMYK
- N/A
- Colore RGB
- R: 241 G: 239 B: 237
- Rango
- falda
- Uso
- Unità in uso.
- Status
- valido
Nomenclatura
- Deutsch
- Lebendun-Decke
- Français
- Nappe du Lebendun
- Italiano
- Falda del Lebendun
- English
- Lebendun Nappe
- Origine del nome
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Lebendun = Vallone del Vannino (Italia), Alta Val Formazza (N.B. Punta Lebendun und Passo di Lebendun stehen in der Monte-Leone-Decke)
- Varianti storiche
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nappe II = nappe du Lebendun (Argand 1911), rückgefaltete und eingewickelte Teil der Bernharddecke = Lebendungneiszone = Lebendundecke (Grütter 1929), Lebendun-Lappen (Niggli et al. 1936), Falda Lebendun (Godenzi 1963), Lebendun-Zone = Lebendun-Zug [?] (Wieland 1966), Lebendunserie (Joos 1967), Ricoprimento Lebendun = complesso Lebendun = lobo di Lebendun (Bianconi 1971), Lebendun-Decke (Bearth 1973), falda di ricoprimento del Lebendun, Lebendun-Zone, Lebendun-Serie (Etter 1984), nappe du Lebendun (Escher et al. 1987, Spring et al. 1992), nappe n°2 = Lebendun nappe (Carrupt 2003), Lebendun nappe (Steck et al. 2013), Falda del Lebendun (Della Torre & Maggini 2015), Lebendun Nappe (Gouffon et al. 2024)
Descrizione
- Descrizione
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Steck et al. 2013, p.435: The Lebendun nappe is composed of a polymictic conglomerate and a micaschist (‘‘schisti bruni’’, Burckhardt 1942; Burckhardt and Gu¨nthert 1957; Joos 1969). Pebbles of Triassic dolomite testify the post-Triassic, possibly Cretaceous age of these sediments (Rodgers and Bearth 1960; Spring et al. 1992). It occupies a large zone to the north of the Antigorio nappe and Sambuco unit. Another up to 50 m thick band of Lebendun conglomerate is exposed on the mountain ridge to the north of the Pizzo di Bronzo in the upper Valle dell’Isorno, between the Bosco zone on top and the Antigorio gneiss at the base. The tectonic position of the Lebendun conglomerates suggests that they have been thrust from the south of the Maggia and the north of the Monte Leone nappes (Fig. 4).
Prevalgono metapeliti e gneiss di origine sedimentaria, localmente conglomeratici.
Gerarchia e successione
- Unità sovrastante
- Unità sottostante
- Limite superiore
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Monte-Leone-Decke bzw. Bosco-Zone
- Limite inferiore
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Antigorio-Decke
Età
- Geomorfologia
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- Mesozoico
- Osservazioni sul tetto
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unsicher
- Età alla base
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- Paleozoico
- Osservazioni sulla base
-
unsicher
Geografia
- Estensione geografica
- Alpi Lepontine: Crevola d'Ossola, Val Divedro, Zwischbergental, Alte Kaserne, Val Devero, Lebenduntal, Val Formazza, Basodino, Val Bedretto [kommt auf den GA25-Blättern 034_Basodino, 061_Simplon, 068_Val-Bedretto, 093_Brig, 138_Ambri-Piotta, 145_Bosco/Gurin, sowie XXX_Binntal vor].
Referenze
- Revisione
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(2024) :
Tectonic Map of Switzerland 1:500000, Explanatory notes. Federal Office of Topography swisstopo, Wabern
p.48: The Lebendun Nappe overlaps the Antigorio Nappe on its northwestern edge. It is overlapped by the Pizzo del Vallone in the west and by the Sambuco Nappe in the northeast. In the north, it is bordered by the calcschists of the Sion-Courmayeur Nappe. The end of the Lebendun Nappe to the east is not clearly established, as its rocks around the Sambuco Nappe – mainly siliceous and carbonate schists – are quite similar to the metasediments of neighboring units. Its extension on the map is in accordance with Probst (1980; including his San Giacomo Unit) and Leu (1986; including his Sabbione Zone, without the basal part that constitutes the Pizzo del Vallone Nappe). To the southwest, it ends near the Swiss–Italian border in the valley descending from the Simplonpass. Further east, it forms a narrow band between the Antigorio Nappe and the Bombogno Zone in Italy, which is too thin to be drawn on the map. The Lebendun Nappe is constituted by foliated metasediments of arkose origin (shales and conglomerates) and is surrounded by calcschists and marbles. Pebbles of dolomites in the conglomerates suggest a post-Triassic deposition age for all these rocks (Rodgers & Bearth 1960, Spring et al. 1992).