Campo-Decke
Torna a Falda del CampoRappresentazione e statuto
- Colore CMYK
- N/A
- Colore RGB
- R: 241 G: 239 B: 237
- Rango
- falda
- Uso
- Unità in uso.
- Status
- valido
Nomenclatura
- Deutsch
- Campo-Decke
- Français
- Nappe de Campo
- Italiano
- Falda di Campo
- English
- Campo Nappe
- Origine del nome
- Varianti storiche
-
mittelostalpine Decke = Campo-Decke (Alb. Heim 1922), Campodecke (Rösli 1928, Spillmann 1993), Campo-Decke s.l. > Campo-Decke s.str. (Staub 1946), falda di Campo (Pozzi 1957), falda Campo (Godenzi 1963, Montrasio et al. 2012), Campo-Languard-Einheit (Dössegger 1987), Campo Nappe (TK500 / Gouffon et al. 2024)
Descrizione
- Descrizione
-
Wurde füher als «Mittelostalpin» interpretiert, d.h. strukturell und faziell am Übergang zwischen Unter- und Oberostalpin.
Furrer et al. 1985: A large, possible complex body of basement rocks. Where Languard sediments are absent, the distinction between Languard and Campo basement is difficult.
Gerarchia e successione
- Limite inferiore
-
Bernina-Deckenkomplex
Geografia
- Estensione geografica
- SE der Engadin-Störung
Referenze
- Revisione
-
(1985) :
Field workshop on Triassic and Jurassic sediments in the Eastern Alps of Switzerland. Mitt. geol. Inst. ETH und Univ. Zürich (N.F.) 248, 81 S.
p.94: The Campo Nappe is the largest unit of the Campo Nappe Complex and predominantly consists of Variscan basement, locally intruded by Permian magmatites (e.g., Sondalo Gabbro, Martell Granite; Bockemühl 1988, Petri et al. 2017). This nappe tectonically overlies the Masuccio Nappe in the southwest and the Languard Nappe in the northeast and extends all along the base of the tectonically higher Ortler Nappe. Its former Permian–Mesozoic cover has been almost completely detached very early during WNW-directed Late Cretaceous thrusting (Conti 1992) and is not present nowadays due to erosion. However, small occurrences of Permian–Mesozoic sedimentary rocks remain more or less attached to the basement of the Campo Nappe. A thin slice of Mesozoic cover of the Campo Nappe located at the footwall of the overlying Grosina Nappe is preserved west of Piz Sena in Val Poschiavo (Schudel 1965). Very small outcrops of Permian Verrucano located east of Bormio are found in the footwall of the basal thrust of the Ortler Nappe, here formed by the Carnian Raibl Group (Montrasio et al. 2012). Carnian deposits of the Raibl Group also accompany an E–W striking thrust within the basement of the Campo Nappe south of Sulden (within Variscan phyllites of the “Scaglia dello Zebrù”, Montrasio et al. 2012).
Lithologically, the Variscan basement of the Campo Nappe is dominated by metasedimentary sequences of variable pre-Alpine metamorphic grade, ranging from amphibolite facies in the south (e.g., around the Permian Sondalo Gabbro; Mohn et al. 2011, Petri et al. 2017) to greenschist facies in the north (e.g., “Filladi di Bormio” and phyllites of the “Scaglia dello Zebrù”). The Alpine metamorphism grade ranges from lower to upper greenschist facies, defined by mineral assemblages and microstructures in the southern Campo Nappe (Werling 1992, Meier 2003, Viola et al. 2003), to lower greenschist-facies conditions in the north. Widespread penetrative greenschist-facies deformation within the Campo Nappe of Alpine age has also been documented for the above-mentioned Variscan phyllites found along the northern rim of the Campo Nappe.