Evidence of Tethyan continental break-up and Alpine collision in the Argentera-Mercantour Massif, Western Alps - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Lithos Année : 2020

Evidence of Tethyan continental break-up and Alpine collision in the Argentera-Mercantour Massif, Western Alps

Marco Filippi
Davide Zanoni
  • Fonction : Auteur
Jean-Marc Lardeaux
Maria Iole Spalla
Guido Gosso
  • Fonction : Auteur

Résumé

In the Argentera-Mercantour Massif, swarms of high-K calc-alkaline lamprophyres intruded into Carboniferous migmatites and early Permian granites, likely in Permian-Triassic times. The dykes collected multiple magmatic injections, the latest of which of alkaline affinity. Syn-intrusive vesicles and straight chilled margins suggest that the lamprophyres emplaced at a shallow crustal level.Lower greenschist facies mineral assemblages replaced lamprophyre igneous minerals as a result of late-intrusive hydrothermal circulation that occurred soon after the dyke emplacement. The hydrothermal event is constrained at T = 300–350°C and P < 0.1 GPa by matching thermobarometry and pseudosection results. During the Alpine collision, the lamprophyres were intersected by upper greenschist facies mylonitic shear zones developed at T = 420–450°C and P = 0.2–0.4 GPa, which are the metamorphic peak conditions of the Argentera-Mercantour Massif in Alpine times.
Fichier principal
Vignette du fichier
S0024493720302905.pdf (89.41 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-02955783 , version 1 (18-07-2022)

Licence

Paternité - Pas d'utilisation commerciale

Identifiants

Citer

Marco Filippi, Davide Zanoni, Jean-Marc Lardeaux, Maria Iole Spalla, Guido Gosso. Evidence of Tethyan continental break-up and Alpine collision in the Argentera-Mercantour Massif, Western Alps. Lithos, 2020, 372-373, pp.105653. ⟨10.1016/j.lithos.2020.105653⟩. ⟨hal-02955783⟩
35 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More