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Crustal dynamics: from the field observations to quantification

Crustal dynamics: from the field observations to quantification

Massif du Mont Blanc

Teaching manager : Philippe, Hervé Leloup 

Other teachers: Véronique Gardien and Gweltaz Mahéo

Teaching hours : 30h (including 3 days in the field)

General Objectives

From a practical example (in this case the Mont-Blanc massif in the Alps) the goal is to learn how to define the best field targets in order to decipher the geological history of the area, and during field investigations to decide a sampling strategy to allow the quantification of the involved geological process (deformation, metamorphism, magmatism, exhumation, uplift).

Pedagogic content.

The class consists of three field days and two days of indoor data analysis.

Given the time constraints the students will not be able to fully analyse their own samples but they will learn how to prepare them, do some fluid inclusions analysis, and use a collection of thin section and already acquired data (e.g. chemical analysis, geochronology, thermometry, structural data) in order to build their own scientific approach and interpretations.

The main investigated subjects will be:

- The structure: general geometries (in map view and along cross-sections), shear zones kinematics (microtectonics), relative chronology, amounts of deformation.

- The dating: relative chronology, geochronology, thermochronology.

- The pressure and temperature conditions: metamorphic facies, global and mineral chemical equilibria (PERPLEX), microthermometry.

- Thermo-kinematic modelling using low-temperature thermochronologcal data (PECUBE).

 

On the field : Plan de l'Aiguille