Ofiolite della falda di Antrona
Representation and status
- Color CMYK
- (38%,0%,25%,37%)
- Color RGB
- R: 100 G: 160 B: 120
- Rank
- tectonically bounded lithostratigraphic unit
- Validity
- Unit is in Use
- Status
- informal term
Nomenclature
- Deutsch
- Ophiolith der Antrona-Decke
- Français
- Ophiolite de la nappe d'Antrona
- Italiano
- Ofiolite della falda di Antrona
- English
- Ophiolite of the Antrona nappe
- Origin of the Name
- Historical Variants
-
Ophiolite der Antrona-Anzasca-Mulde (Bearth 1939), Ophiolithe von Antrona-Bognanco = Ophiolithe der Zone von Antrona = Antronamulde (Bearth 1956), Antrona ophiolitic unit, Antrona ophiolite complex, Antrona mafic-ultrmafic complex (Colombi & Pfeifer 1986), unità ofiolitica di Antrona = ofioliti della Zona di Antrona = ofioliti mesozoiche di Antrona (Dal Piaz et al. 1992a), Antrona ophiolites (Keller 2004, Steck et al. 2015)
Description
- Description
-
Serpentinite, Metabasalte und Metagabbros (mit Eklogitrelikten), sowie Kalkschiefern (ehemalige Sedimentbedeckung)
Hierarchy and sequence
- Upper boundary
-
Portjengrat-Einheit
- Lower boundary
-
Monte-Rosa-Decke
Age
- Age at top
-
- Kimmeridgian
- Age at base
-
- Callovian
- Dating Method
-
163.1 +/- 2.4 Ma, 158 +/-17 Ma and 155.6 +/- 2.1 Ma (U/Pb SHRIMP zircon ; Liati et al. 2005)
Palaenography and tectonic
- Paleogeography
- Piemont Basin
- Tectonic unit (resp. main category)
- Kind of protolith
-
- ophiolitic
- Metamorphic facies
-
- greenschist facies (epizone)
- amphibolite facies
- eclogite facies
- Note on metamorphism
-
HP-mtm (eclogite) + greenschist/amphibolite
References
- Definition
-
(2001) :
Low-grade metamorphism of the Gets nappe (Western Alps). Schweiz. Mineral. Petrogr. Mitt. 81, 229-237
The Antrona and Zermatt-Saas ophiolitic nappes are found in a structurally low position. They are affected by high-P metamorphism (eclogite facies) followed by greenschist to amphibolite grade metamorphism (Bearth, 1974; Dal Piaz, 1974b; Hunziker, 1974; Dal Piaz and Ernst, 1978; Colombi, 1989; Steck, 1989; Vannay and Allemann, 1990; Reinecke, 1991; Amato et al., 1999).
-
Anfibolite della Val Loranco
- Name Origin
-
Val Loranco (Italia)
- Rank
- lithostratigraphic unit
- Status
- informal term
- In short
-
Reliktische Pillow-Lava Strukturen wurden von Tacchini und Zingg (1999) in den Amphiboliten des Antronatales beobachtet.
- Age
- Middle Jurassic
-
Eclogite di Andolla
- Name Origin
-
Rifugio/Alpi di Andolla (Italia), Valle di Loranco
- Rank
- lithostratigraphic unit
- Status
- local name (informal)
- Age
- Late Cretaceous
-
Serpentinite di Cisore
- Name Origin
-
Cisore (Italia), W Domodossola
- Rank
- lithostratigraphic unit
- Status
- local name (informal)
-
Serpentinite della Punta della Forcola
- Rank
- lithostratigraphic unit
- Status
- informal term
-
Peridotite degli Alpi di Cama
- Name Origin
-
Alpi di Cama (Italia), NE Antronapiana
- Rank
- lithostratigraphic unit
- Status
- local name (informal)