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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Kinematic analysis of deformed quartzite from the Vysoký kámen: implications for development of the Saxothuringian orogenic wedge
 Ildžová, Tamara ; Jeřábek, Petr (advisor) ; Jouvent, Marine (referee)
The Saxothuringian orogenic wedge is an impressive example of a collisional orogenic wedge formed during the Variscan orogeny in the Bohemian Massif. The Vysoký kámen area in the Erzgebirge Mountains (Saxothuringian Domain) represents a part of the outer wedge which was not subducted into the great depths during the evolution of the wedge. To better understand a polyphase deformation in this frontal part of the former accretionary wedge, the study focuses on macro and micro-scale analyses of deformed quartzite and quartz veins from the Vysoký kámen area. Two main deformation fabrics (S1 and S2) were formed under slightly different P-T conditions and linked to two deformation events (D1 and D2). The S1 fabric defined by coarse-grained recrystallised quartz grains and by axial planes of folded quartz veins is related to a simple shear regime but also shows stretching in the folds axes in the NS direction. This subhorizontal and gently eastward dipping metamorphic foliation is associated with deformation event D1 during which the area subducted. Minerals such as paragonite and rutile, and a higher silica content up to 3.17 a.p.f.u. recorded in micas reflect a subduction environment. The second deformation fabric S2, characterised by fine-grained recrystallisation, is generally identified as...
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Polyphase structural evolution of superstructure and infrastructure in orogenic zones
 Peřestý, Vít ; Lexa, Ondrej (advisor) ; Pitra, Pavel (referee)
Polyphase structural evolution of superstructure and infrastructure in orogenic zones Proterozoic basement rocks of the Teplá-Barrandian Unit (TBU) are affected by two main tectono-metamorphic events. The central and SW part of the TBU is a well-preserved relict of Cadomian episode. On the other hand, the western margin of the TBU shows superposition of polyphase early-varicsan deformation and metamorphism onto the pre- variscan fabric. The Střela river profile in the northern part of Teplá Crystalline Complex (TCC) exposes a continuous crustal section through western margin of the TBU from the low-grade phyllites (near biotite izograd) in the east to the high-grade rocks of kyanite zone at the contact with high-pressure Mariánské-Lázně Complex (MLC). Three main deformation events were distinguished in the studied area and the cross-section is interpreted as a fossil (devonian) suprastructure-infrastructure transition zone preserved in the carboniferous TBU superstructure. The oldest pre-variscan D1 phase produced flat-lying metamorphic foliation showing normal metamorphic zonation from the very low-grade in the upper part to at least garnet zone in the structurally lower part. Large scale upright folding of prevariscan foliation S1 occurred during early-variscan D2 event. Tight F2 folds were...
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