unità della Balma
Representation and status
- Color CMYK
- N/A
- Color RGB
- R: 241 G: 239 B: 237
- Rank
- tectonic
- Validity
- Unit is in Use
- Status
- local name (informal)
- Status discussion
Nomenclature
- Deutsch
- Balma-Einheit
- Français
- unité de la Balma
- Italiano
- unità della Balma
- English
- Balma unit
- Origin of the Name
-
Alpe la Balma (Italia), alta Valsesia
- Historical Variants
-
Balma unit (Pleuger et al. 2005, Liati & Froitzheim 2006, Steck 2008, Steck et al. 2015), Balma ophiolite (Kirst 2017)
Hierarchy and sequence
- Upper boundary
-
Stolemberg-Einheit bzw. Zermatt-Saas-Zone
- Lower boundary
-
Monte-Rosa-Decke
Age
- Age at top
-
- Turonian
- Age at base
-
- Cenomanian
- Dating Method
-
Protolithalter: 93.4 +/-1.7 Ma (U-Pb SHRIMP zircon ; Liati & Froitzheim 2006, cf. Chiavenna-Ophiolith) ; eklogitfazielle Metamorphose : 45-42 Ma (Lu-Hf, Granat).
Palaenography and tectonic
- Paleogeography
- Valaisan Basin
- Tectonic unit (resp. main category)
References
- Definition
- (2006) : Assessing the Valais ocean, Western Alps: U-Pb SHRIMP zircon geochronology of eclogite in the Balma unit, on top of the Monte Rosa nappe. European Journal of Mineralogy 18, 299–308