|
|
Metamorphism of gabbroic rocks of Teplá-Barrandien Unit
Holá, Petra ; Racek, Martin (advisor) ; Janák, Marian (referee) ; Collett, Stephen (referee)
In the thesis I focuse on petrographic, geochronological and geochemical characterization of gabbroic rocks to provide constrains on the Cambro-Ordovician and Variscan evolution of the Teplá-Barrandian Unit in Bohemian Massif situated in Central Europe. The studied rocks occur in two areas of interest in the western margin of the Teplá-Barrandian: (1) along the contact of the Teplá Crystalline and Mariánské Lázně Complexes in the north-western part of the TBU, (2) in area between the Domažlice Crystalline Complex and Kdyně-Neukirchen Massif (KNM) in the south-western part of the Teplá-Barrandian Unit. Detailed petrological study together with U-Pb dating of representative samples allow to characterize three events (I-III) defined by different textural position of analyses zircon and titanite grains. The oldest (Cambrian) event I is recorded in isolated metamictized matrix-hosted grains that yield similar mean age of c. 500-510 Ma in both areas. The second Cambro-Ordovician event II was connected with formation of tiny zircon grains forming rim around ilmenite at ~480-490 Ma due to diffusion reaction of ilmenite and surrounding silicate matrix enabled by increase of temperature. The youngest (Variscan) event III is associated with the formation of zircon corona around baddeleyite at ca. 360-380 Ma....
|
|
|
Corpus, Corporeality, Carnality
Lienerová, Lucie ; Čech,, Viktor (referee) ; Fexová, Patricie (advisor)
The subject of the diploma thesis is corpus, corporeality and carnality inspired by Ovid's Metamorphoses. The practical outcome is a series of paintings, drawings and objects thematizing the particular parts of the transformation of human, object and environment into individual organic forms. The transformation of the human being itself is seen as a painful process, but one that also allows for liberation from much more extensive physical and psychological suffering. The motifs of transformation are shaped and documented in a painterly way on the artist's close person and then on the environment and objects that surround this person.
|
|
| |
|
|
Tectonic and metamorphic evolution of the Tokar-Barka Terrain (East-African Orogeny)
Hořenínová, Marie ; Verner, Kryštof (advisor) ; Peřestý, Vít (referee)
in English This bachelor's thesis summarizes the tectonic and metamorphic evolution of the Tokar-Barka Unit in the southern part of the Arabian-Nubian Shield. The compilation includes an information of regional division, lithological pattern, age, deformation structures and record of metamorphic evolution, mainly in the context of East African orogenic processes. The main episodes of geodynamic evolution are briefly discussed in a regional context. Key words: East-African Orogeny, Arabian-Nubian Shield, Tokar-Barka Unit, Deformation, Tectonics, Metamorphic evolution
|
|
|
The growth and development of wings during ontogeny with emphasis on Palaeodictyoptera
Rosová, Kateřina ; Prokop, Jakub (advisor) ; Sroka, Pavel (referee)
The series of two fossil species belonging to the order Palaeodictyoptera from the Late Carboniferous of Kuznetsk Basin in Russia were re-examined. The two species as Tchirkovaea guttata and Paimbia fenestrata were investigated with emphasis on the wing growth and development in comparison with the structure of developing wings in recent mayflies. This fossil material of T. guttata and P. fenestrata was long considered by previous authors as undisputed evidence for a unique type of wing development in the Palaeozoic insects. The idea was that the larvae of these insects possessed the wings, which became articulated and fully movable already earlier during the postembryonic development and that these gradually growing wings changed their position from longitudinal to perpendicular to the body axis. Moreover, the development was supposed to include two or more subimaginal instars, implying that the fully winged instars moulted several times during postembryonic development. After detailed study of the available fossils and subsequent comparison of the fossil evidence with the development of wings in the recent mayfly Cloeon dipterum it was discovered, that the alleged series of immature, subimaginal and imaginal wings of T. guttata and P. fenestrata do not provide clear evidence that would support...
|
|
|
Reproduction and ontogenesis larve toad ( Bufo bufo L.) in Vyšebrodsko, Šumava.
KUS, Lukáš
This bachelor thessis treats with the ontogenesis of bobby-soxers of Bufo bufo (L.). The informations about the global crisis of amphibians, their rapid decrease of species diversity and the fact of importance of arteficial reproduction as the last possibility of species preservation, brought me to this work. I have made observation of ontogenesis of bobby-soxers Bufo bufo from the gamete to the metamorphosed frog, to be able to state the best conditions for their transformations, due to their possible survivance for future.
|
|
| |
|
|
The growth and development of wings during ontogeny with emphasis on Palaeodictyoptera
Rosová, Kateřina ; Prokop, Jakub (advisor) ; Sroka, Pavel (referee)
The series of two fossil species belonging to the order Palaeodictyoptera from the Late Carboniferous of Kuznetsk Basin in Russia were re-examined. The two species as Tchirkovaea guttata and Paimbia fenestrata were investigated with emphasis on the wing growth and development in comparison with the structure of developing wings in recent mayflies. This fossil material of T. guttata and P. fenestrata was long considered by previous authors as undisputed evidence for a unique type of wing development in the Palaeozoic insects. The idea was that the larvae of these insects possessed the wings, which became articulated and fully movable already earlier during the postembryonic development and that these gradually growing wings changed their position from longitudinal to perpendicular to the body axis. Moreover, the development was supposed to include two or more subimaginal instars, implying that the fully winged instars moulted several times during postembryonic development. After detailed study of the available fossils and subsequent comparison of the fossil evidence with the development of wings in the recent mayfly Cloeon dipterum it was discovered, that the alleged series of immature, subimaginal and imaginal wings of T. guttata and P. fenestrata do not provide clear evidence that would support...
|
|
|
Metamorphism and geodynamics of the Proterozoic Kabul Block: Preservation and modification of crustal fragments within an orogenic zone
Collett, Stephen ; Faryad, Shah Wali (advisor) ; Kotková, Jana (referee) ; Krenn, Kurt (referee)
The Kabul Block is a lenticular crustal fragment that, along with the Farah, Helmand, and Nuristan terranes, is situated within a tectonic zone known as the Afghan Central Blocks. The Afghan Cent- ral Blocks form within the collision zone between the Indian, Eurasian, and Arabian plates. The Kabul Block consists of a highly-deformed crystalline basement overlain by weakly-deformed Late Paleozoic- Mesozoic sediments. U/Pb SHRIMP analysis of zircon cores from the lowermost basement formations (the Sherdarwaza and/or Khair Khana) indicates the presence of a Neoarchean component (~ 2700 Ma), while the majority of zircon cores yield a range of Early Paleoproterozoic ages (2200 - 2500 Ma). The Sherdarwaza and Khair Khana Formations are comprised of migmatite and orthogneiss with minor marble, quartzite, and amphibolite that reached granulite-facies conditions. Conventional geother- mobarometry and phase equilibria modelling on well preserved granulite-facies assemblages indicates that the rocks reached conditions of approximately 850 řC at up to 7 kbar of pressure. Textural relations indicate that this was a strongly temperature dominated event. U/Pb SHRIMP dating of zircon rims and U-Th-Pb dating of monazite inclusions in granulite-facies garnet suggest that this event occurred in the late...
|
|
|
Variscan igneous activity at the Bohemicum/moldanubicum boundary
Kubínová, Šárka ; Holub, František (advisor) ; Pertoldová, Jaroslava (referee)
Variscan dike swarms associated with the Central Bohemian Plutonic Complex (CBPC) at the boundary between the Teplá-Barrandian and Moldanubian Units of the Bohemian Massif represent one of the most interesting geological phenomena. Frequency of dykes and their chemical variability do not have any comparable analogy in the whole European Variscides. This work is focused on the study of dyke rocks in the NE periphery of CBPC in geologically very complicated area with intrusions of predominantly deformed granitoids, contact metamorphosed sediments and magmatic rocks of "Islet Zone" with different protolith ages (forming remnants of the original roof of CBPC), deformed basic rocks of uncertain origin and age. The area extends up to the western boundary of the northernmost part of the Moldanubian high-grade metamorphic complex, the boundary itself being also tectonically problematic. Several localities with dyke rocks under study are situated in the area east of Senohraby (SE of Prague), on the northern side (right coast) of the Sázava river, and extend up to the area of Stříbrná Skalice. This area is rich in dykes of gabbro to diorite porphyry accompanied in some places with tonalite (rarely quartz diorite) porphyry and more rarely with amphibole lamprophyres (spessartite). Significantly younger dykes...
|
guest ::
