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Titre : | Métamorphisme de MP-HT dans les Schistes X de la Montagne noire (Massif Central) : Montagne Noire |
Auteurs : | Baptiste VERMOOTE ; Pierre Jean HAINQUE ; Pierre Jean HAINQUE |
Type de document : | Projet d'initiation à la recherche apprenti |
Concepts : | MONTAGNE NOIRE |
Résumé : | The Montagne Noire forms the southern end of the French Massif Central, which belongs to the southern part of the Variscan orogenic belt. It is divided into three geological zones: the northern flank, the axial zone and the southern flank. The northern limit of the southern flank is marked by micaschists, known as the « X Schists ». This probably Cambro-Silurian unit corresponds to the sedimentary cover of the gneiss dome of the axial zone. The geological events responsible for the evolution of the dome are still debated today, but the metamorphism in the « X Schists » is closely linked to them. The metamorphism in the Montagne noire shows a continuous variation from North to South, with LP/HT metamorphism in the dome of the axial zone and a progressive evolution towards MP/HT metamorphism in the X Schists". The current model of dome emplacement mainly considers extensional deformation and granitic intrusions in crustal shear zones to explain the metamorphism in the Montagne noire. As part of this project, a microscopic analysis was performed on samples from the St Pons area. It mainly shows markers of a LP/HT metamorphism, with some local variations. These results are similar to those obtained by GINIAUX et al. (2010). However, it would be interesting to perform more analysis, with more precise methods carried out on a larger sample." |
Spécialité : | Géologie |
Numéro de promo : | 81 |
numéro MIR : | 18 |