Granite des Montées Pélissier
Retour à Massif des Aig. RougesReprésentation et statut
- Couleur CMYK
- (0%,51%,49%,16%)
- Couleur RGB
- R: 215 G: 105 B: 110
- Rang
- Formation lithostratigraphique
- Usage
- Ce terme est en usage.
- Status
- terme informel
Nomenclature
- Deutsch
- Montées-Pélissier-Granit
- Français
- Granite des Montées Pélissier
- Italiano
- Granito delle Montées Pélissier
- English
- Montées Pélissier Granite
- Origine du nom
- Variantes historiques
- --- (Laurent 1967), Montées-Pélissier granite (Dobmeier 1996), Montées-Pélissiers peraluminous granite (Bussy et al. 2000, Capuzzo et al. 2003)
Hiérarchie et succession
- Unité hiérarchiquement supérieure
Âge
- Âge au sommet
-
- Viséen
- Âge à la base
-
- Viséen
- Méthode de datation
- 332 +/-2 Ma (U/Pb on zircon and monazite ; Bussy et al. 2000)
Paléogéographie et tectonique
- Termes génériques
-
-
Aiguilles Rouges
:
massif des Aiguilles Rouges
-
Aiguilles Rouges
:
- Type de protolithe
-
- plutonique
Références
- Révision
-
(2001) :
Mont-Blanc, Aiguilles-Rouges massifs (External Massifs) - an example of polyorogenic evolution. Fieldtrip Guide 1, 53-84, Univ. Lausanne
p.66: The Montées-Pélissier granite is a vertical 3 km-long by 500 m-wide sheet-like pluton in tectonic contact with its country-rocks. A transpressive regime induced subhorizontal movements with extreme elongation, subsequently reoriented into subvertical displacements (Dobmeier 1998). The granite intruded syntectonically along ductile shear-zones during the transcurrent stage and recorded the subsequent vertical movements during cooling (Dobmeier 1996). Primary magmatic flow fabrics are mostly superimposed by low-T ductile to brittle deformation. The Montées-Pélissier granite is a fine-grained foliated two-mica monzogranite, which hosts rare biotite-rich restites, mafic microgranular enclaves and biotite-bearing lamprophyres. It is peraluminous with A/CNK values between 1.17 and 1.27; but primary muscovite is scarce and the mean representative point of its zircon morphological population plots at the limit between peraluminous and calc-alkaline granite fields in the typological grid of Pupin (1988).