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From microstructures to large-scale crustal deformations in collisional orogen: multidisciplinary approach
Franěk, Jan ; Schulmann, Karel (advisor) ; Faryad, Shah Wali (referee) ; Stünitz, Holger (referee) ; Whitechurch, Hubert (referee)
The thesis aims to compile response of deep-seated rocks to continental collision in the root zone of Variscan orogen exposed in Bohemian Massif. It treats the orogenic processes from the scale of microscopic grains constituting rocks through scale of individual outcrops to an overall view of ~4000 km2 large domain of the high-grade rocks. The thesis is divided into three chapters. The first represents an article summarizing study of structurally most complex area - Blanský les granulite massif - published in the Mineralogy and Petrology journal (2006). The second chapter unravels regional evolution of the south Bohemian Moldanubian domain and correlates the presented results with suitable studies from other orogenic regions or with numerical models of continental collisions. The related article will be submitted to Tectonics journal in June 2007. The last section focuses on the mechanisms of deformation in the felsic granulites and extrapolates the results to rheology of the Variscan lower crust and behavior of common felsic rocks under HT HP conditions. The corresponding paper will be submitted to Journal of Metamorphic Geology in the autumn 2007. The Bohemian massif represents the easternmost exposure of Variscan orogen in Europe. During the 380-300 Ma complex subduction - collision a ~300km...
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Localization of deformation in rocks with existing anisotropy: consequences for geodynamic interpretations
Bukovská, Zita ; Jeřábek, Petr (advisor) ; Stünitz, Holger (referee) ; Grasemann, Bernhard (referee)
Localization of deformation occurs in Earth's crust as a consequence of applied stress and is widespread phenomenon that can be found in crustal rocks. Such localization of deformation can be mostly seen in a form of shear zones. Small shear zones referred as shear bands or S-C structures are often used as kinematic indicators. However, the evolution and kinematic continuity of such structures is not well identified, which makes it problematic when interpreting regional geodynamic evolution. Two possible cases were distinguished and described in this thesis: a) kinematically discontinuous S-C structures formed during two deformation events and b) kinematically continuous S-C structures formed during single deformation event. Kinematically unrelated S-C structures were studied in westernmost part of Tauern Window in Eastern Alps and in Gemer-Vepor Contact Zone in Central West Carpathians where previous geodynamic interpretations might have misinterpreted localization structures. Kinematically continuous shear bands were studied in South Armorican Shear Zone where the S-C fabrics were originally defined and described (Berthé et al., 1979). Two fabrics that crosscut each other at small angles forming S-C geometries were documented during field work and studied from macroscale down to microscale or...
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From microstructures to large-scale crustal deformations in collisional orogen: multidisciplinary approach
Franěk, Jan ; Schulmann, Karel (advisor) ; Faryad, Shah Wali (referee) ; Stünitz, Holger (referee) ; Whitechurch, Hubert (referee)
The thesis aims to compile response of deep-seated rocks to continental collision in the root zone of Variscan orogen exposed in Bohemian Massif. It treats the orogenic processes from the scale of microscopic grains constituting rocks through scale of individual outcrops to an overall view of ~4000 km2 large domain of the high-grade rocks. The thesis is divided into three chapters. The first represents an article summarizing study of structurally most complex area - Blanský les granulite massif - published in the Mineralogy and Petrology journal (2006). The second chapter unravels regional evolution of the south Bohemian Moldanubian domain and correlates the presented results with suitable studies from other orogenic regions or with numerical models of continental collisions. The related article will be submitted to Tectonics journal in June 2007. The last section focuses on the mechanisms of deformation in the felsic granulites and extrapolates the results to rheology of the Variscan lower crust and behavior of common felsic rocks under HT HP conditions. The corresponding paper will be submitted to Journal of Metamorphic Geology in the autumn 2007. The Bohemian massif represents the easternmost exposure of Variscan orogen in Europe. During the 380-300 Ma complex subduction - collision a ~300km...
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Localization of deformation in rocks with existing anisotropy: consequences for geodynamic interpretations
Bukovská, Zita ; Jeřábek, Petr (advisor) ; Stünitz, Holger (referee) ; Grasemann, Bernhard (referee)
Localization of deformation occurs in Earth's crust as a consequence of applied stress and is widespread phenomenon that can be found in crustal rocks. Such localization of deformation can be mostly seen in a form of shear zones. Small shear zones referred as shear bands or S-C structures are often used as kinematic indicators. However, the evolution and kinematic continuity of such structures is not well identified, which makes it problematic when interpreting regional geodynamic evolution. Two possible cases were distinguished and described in this thesis: a) kinematically discontinuous S-C structures formed during two deformation events and b) kinematically continuous S-C structures formed during single deformation event. Kinematically unrelated S-C structures were studied in westernmost part of Tauern Window in Eastern Alps and in Gemer-Vepor Contact Zone in Central West Carpathians where previous geodynamic interpretations might have misinterpreted localization structures. Kinematically continuous shear bands were studied in South Armorican Shear Zone where the S-C fabrics were originally defined and described (Berthé et al., 1979). Two fabrics that crosscut each other at small angles forming S-C geometries were documented during field work and studied from macroscale down to microscale or...
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