HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

Plastic deformation and recrystallization processes of minerals control the rheological behavior of the lower continental and oceanic crusts during their tectonic history. Deformation of polyphase rocks like granites and gabbros occur over a wide range of temperatures, pressures, strain rates, and fluid conditions. In these rocks plagioclase is ubiquitous, constituting a third to a half of the whole mineralogical assemblage, and is