Falda Malenco-Forno-Lizun
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
- Malenco-Forno-Lizun-Decke
- Français
- Nappe de Malenco-Forno-Lizun
- Italiano
- Falda Malenco-Forno-Lizun
- English
- Malenco-Forno-Lizun Nappe
- Varianti storiche
-
Ophiolithzug Val Maroz-Malenco (Staub 1921), Zone von Châtillon-Malenco (Staub 1942b), Malenker Ophiolith-Decken (Staub 1946), Zone Disgrazia-Val Malenco (Roesli 1946), Forno-Decke, Monte-del-Forno-Serie (Ferrario & Montrasio 1976), Monte-del-Forno-Komplex (Peretti 1985), Falda ofiolitica Malenco-Forno (Sciesa 1991), Malenco-Forno-Lizun-Einheit (Spillmann 1993), Malenco-Forno-Lizun units (Manatschal 1995), Malenco-Forno-Lizun-Decke (Spillmann & Trommsdorff 2007), Malenco-Forno-Lizun Nappe (TK500 / Gouffon et al. 2024), cf. Trommsdorff et al. 1993
Descrizione
- Descrizione
-
Reliktischer exhumierter subkontinentaler Mantel, ozeanischer Basalt und Sedimente.
Gerarchia e successione
- Unità di rango inferiore
- Limite superiore
-
Margna-Decke (Unterostalpin)
Geografia
- Estensione geografica
- Tiefste tektonische Einheit der Bernina-Gruppe.
Paleogeografia e tettonica
- Tipo di origine
-
- tettonico
Referenze
- Definizione
- (1921) : Geologische Karte der Val Bregaglia (Bergell ; 1:50'000). Geologische Spezialkarte 90
- Revisione
-
(2024) :
Tectonic Map of Switzerland 1:500000, Explanatory notes. Federal Office of Topography swisstopo, Wabern
p.78: Three units with distinct lithological assemblages of oceanic origin, situated in adjacent areas, form the Malenco-Forno-Lizun Nappe. The Malenco unit (Montrasio et al. 2005) consists of large volumes of serpentinite that represent exhumed subcontinental mantle formerly exposed at the ocean floor, and, in a small area adjacent to the Margna Nappe, a transition into continental lower crust in Permian granulite facies, associated with a Permian gabbroic intrusion (Müntener & Hermann 1996). Further north, the Forno unit consists of metabasalts and metagabbros of oceanic origin covered by metasedimentary rocks of Jurassic to Early Cretaceous age, which are in direct contact with the roof of the Bregaglia Intrusion (Puschnig 1998, Froitzheim et al. 1996 a). The Lizun unit, located around the Piz Lizun, northwest of the Engadine Fault and sinistrally offset from the Forno unit (Schmid & Froitzheim 1993), exposes same rocks of oceanic origin as in this latter unit (Liniger & Nievergelt 1990). The Malenco-Forno-Lizun Nappe, together with the Platta Nappe, is located in the hangingwall of the Turba Normal Fault (Nievergelt et al. 1996).
- Pubblicazioni importanti
-
(1993) : From magmatism through metamorphism to sea floor emplacement of subcontinental Adria lithosphere during pre-Alpine rifting (Malenco, Italy). Schweiz. mineral. petrogr. Mitt. 73, 191-203
-
Lizun-Grünschiefer
- Name Origin
- Rango
- unità litostratigrafia
- Statuto
- termine informale
- In breve
-
Metabasika der Malenco–Forno–Lizun-Decke nördlich der Engadiner-Linie. Metasedimente fehlen in dieser Region.
-
Complesso del Monte del Forno
- Name Origin
- Rango
- tettono-stratigrafia
- Statuto
- termine informale
- In breve
-
Within the Upper Penninic Malenco-Forno-Lizun Nappe, the Forno unit is situated southeast of the Engadine Fault and is sinistrally offset from the Lizun unit. It consists of metabasalts and metagabbros of oceanic origin covered by metasedimentary rocks of Jurassic to Early Cretaceous age, which are in direct contact with the roof of the Bregaglia Intrusion.
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Quarziti del Muretto
- Name Origin
-
Val Muretto (GR), östlich des Malojapasses
- Rango
- Formazione litostratigrafica
- Statuto
- termine informale
- In breve
- Schistes quartzeux à diopside et plagioclase (bytownite). Le protolithe devait être une arkose à matrice argileuse et ciment carbonaté (Mützenberg 1986).
- Age
- Tardo Cretacico
-
Formazione dei Rossi
- Name Origin
- Rango
- unità litostratigrafia
- Statuto
- termine informale
- In breve
- Metasedimente (kalkhaltige Andalusit-Granat-Biotitschiefer) des Monte-del-Forno-Komplexes.
- Age
- Später Jura
-
Quartziti di base
- Rango
- unità litostratigrafia
- Statuto
- termine informale
- In breve
- Quarzit mit lokal zwischengeschaltete Amphibol-Pyroxen-Grünschiefer, Mn-Silikate und kalksilikat-führende Marmore.
-
Anfibolite del Forno
- Name Origin
- Rango
- unità litostratigrafia
- Statuto
- termine informale
- In breve
- Getüpfelter (gefleckter) bis gebänderter Amphibolit (MORB-Metabasalt ; Gautschi 1980) mit Porphyroblasten aus metamorphem Plagioklas. Pillowstrukturen (mit Epidotschlieren und Kalksilikatlagen als «Interpillow-Sedimente») und Hyaloklastite sind lokal erhalten.
- Age
- Callovien
-
Ofiolite del Forno
- Rango
- unità litostratigrafia
- Statuto
- termine informale
- In breve
- Ophiolithsequenz des Monte-del-Forno-Komplexes.
-
Corpo ultramafico della Val Malenco
- Name Origin
- Rango
- tettono-stratigrafia
- Statuto
- termine informale
- In breve
-
Within the Upper Penninic Malenco-Forno-Lizun Nappe, the Malenco unit consists of large volumes of serpentinite that represent exhumed subcontinental mantle formerly exposed at the ocean floor, and, in a small area adjacent to the Margna Nappe, a transition into continental lower crust in Permian granulite facies, associated with a Permian gabbroic intrusion.
-
Oficarbonati della Val Ventina
- Name Origin
- Rango
- unità litostratigrafia
- Statuto
- termine locale (informale)
- In breve
- Ophikarbonat des Val-Malenco-Ultramafititkörpers, diskordant zu den alpinen Strukturen streichend.
-
Ur-Brekzie
- Name Origin
- Rango
- tettono-stratigrafia
- Statuto
- termine informale
- In breve
- Ophikarbonate bzw. tektonische Brekzie am Kontakt zwischen der Margna-Decke und dem Malenco-Serpentinit.
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Oficarbonati di Scermendone
- Name Origin
- Rango
- unità litostratigrafia
- Statuto
- termine locale (informale)
- In breve
- Ophikarbonate mit Sedimentstrukturen (Gradierung) des Val-Malenco-Ultramafititkörpers.
-
Gabbro del Monte Braccia
- Name Origin
- Rango
- Formazione litostratigrafica
- Statuto
- termine informale
- In breve
- Gabbroide Intrusion im Bereich der Krusten-Mantel-Grenze (d.h. zwischen Margna- und Malenco-Decke).
- Age
- Cisuralien (= Frühes Perm)
-
Serpentinite della Val Malenco
- Name Origin
- Rango
- unità litostratigrafia
- Statuto
- termine informale
- In breve
-
Grüner bis rostrotbraun anwitternder, Chlorit und/oder Brucit führender, magnetitreicher Antigoritschiefer mit wechselndem Gehalt an Diopsid und Olivin. Schwarze, gelängte Erzaggregate, die zur Hauptsache aus Magnetit bestehen, treten häufig vor.
- Age
- Bajocien