Geodynamics

The Geodynamics course presents, studies and characterizes the major processes associated with solid Earth geodynamics: mantle dynamics, plate tectonics, plate boundaries (break-ups, subductions, collisions, oceanic expansion) and intraplate domains. These systems and processes are studied using natural examples on the scale of the crust and lithosphere, with emphasis on the integration of the various data and tools used in Earth sciences (geophysics, geochemistry, structural geology, rock mechanics, petrology, etc.) NB: the hydrosphere, biosphere and atmosphere are not covered.

Lectures are combined with practical sessions focusing on the analysis and synthesis of documents in order to characterize geodynamic processes, drawing on the concepts covered in geosciences since S1.

Hourly volumes :

WC: 3 p.m.

TD: 21 h

Objectives* :

Description, study and understanding of the major geodynamic processes that structure and affect the Solid Earth. Understanding the dynamics of these systems, their evolution over time, and their interactions.

Basic knowledge (L1 and L2 level) of earth sciences (structural geology, geophysics, geochemistry, sedimentology, etc.)

Continuous assessment (TD reports, written exams)

Synthetic description of the concepts covered in CM :

• Introduction: Paleo-reconstructions, kinematics - driving force relationships
• Mantle convection and dynamics, asthenosphere-lithosphere interactions
• Plate kinematics (velocity space, triple point, Eulerian pole, partitioning)
• Rift - Deformation modes, distribution of deformation and seismicity Rift, ridge, expansion, cooling of the oceanic lithosphere
• Subduction - Dynamics, force balance, deformation and arc and back-arc GPS
• Collision - Integrating geology, tectonics and dynamics
• Intra-plate domain (rheology, GIA, viscosity)

Understanding the geodynamic processes affecting the solid Earth

Understanding the workings of major plate boundary systems

Integrate data and information from all fields of Earth science to characterize the geodynamics of the solid Earth.

Ability to place natural examples in their theoretical context (plate tectonics, balance of forces, etc.)