Abstract
Neoformations and transformations of clay minerals in tectonic shear zones of the Penninikum (Hohe Tauern/Austria) were investigated by X-ray diffraction, optical and X-ray microanalytical methods. The shear zones developed in granite-gneisses, gneiss-phyllonites and mica-schists. Low-temperature solution transfers led to chemical alteration of the tectonically crushed rocks and to the formation of clay minerals in shear zones. The distribution of clay minerals and the alteration sequences were evidence of three successive alteration stages. These alteration stages can be characterized by kaolinization, illitization and montmorillonitization. The argillation processes, together with tectonic compression, caused a decrease in permeability and were in this way the main controlling factor for the environment during the development of tectonic shear zones.
Published Version
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