Orthogneiss,mylonite and non coaxial deformation of granites: the example of the South Armorican Shear Zone |
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Authors: | D Berthé P Choukroune P Jegouzo |
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Institution: | Centre Armoricain d''Etude Structurale des Socles, C.N.R.S., Université de Rennes I, Avenue du Général-Leclerc, 35042 — Rennes—Cédex, France |
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Abstract: | The deformation of two granitic massifs along a dextral wrench fault zone (the South Armorican Shear Zone) is examined at the sample and grain scales. We note that an association of continuous-discontinuous deformation mechanisms is responsible for the mylonitisation at the grain scale. The general characteristics of the deformation (strain, ellipsoid type, strain regime, non-coaxial model) and quartz fabrics measured in these mylonites at each of the mylonitisation stages described, are also discussed. |
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