Doctoral training on internal Earth

Les Houches, 15-26 octobre 2018

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Mineralogy-petrophysics: deformation process and compositional evolution of the lithosphere and asthenosphere

Wednesday 9 September 2015

Mineralogy-petrophysics: deformation process and compositional evolution of the lithosphere and asthenosphere

- Andrea Tommasi (Université de Montpellier)

  • Lecture 1 – 1h30 – Introduction: Mineralogy & petrological processes in the upper mantle (phase changes, fusion, reactive transport of melts). Case studies: Ronda & Lherz. (Course1.pdf)
  • Lecture 2 – 1h – How do the lithosphere and asthenosphere deform? Basic behaviors. Deformation mechanisms: Dislocation creep, diffusion creep, grain boundary sliding.
  • Lecture 3 – 1h30 – Deformation mechanisms (continuation) & Rheology (Course 2&3.pdf)
  • Lecture 4 – 1h - Shear zones – strain localization at different depths in the lithosphere (course 4)
  • Lecture 5 – 1h30 - Deformation and anisotropy of physical properties (seismic, thermal, and mechanical anisotropy) (course 5)
  • Lecture 6 – 1h – Melts and deformation. Water cycle. Hydration and deformation. (course 6)

- Patrick Cordier (Université de Lille):
Title: The physics behind rheology: understanding for modeling (or the opposite…)
Abstract: The rheological behavior of lithospheric and mantle rocks takes place under conditions that cannot be reached experimentally. Several physical mechanisms are responsible for the ductile flow of rocks and minerals. Their modeling is the only way to link observations and experimental results to natural processus. We will present the current efforts to develop multi scale modeling of the rheology of minerals. Applications to ductile deformation of olivine under lithospheric conditions and deformation at depth of its high-pressure polymorphs will be presented.