Irena Olšanská: Late Variscan volcano-plutonic complexes as markers of evolution of post-orogenic tectonic processes
This Ph.D. project is focused on the volcanic and igneous processes associated with the late Variscan post-orogenic tectonomagmatism. The content of the work includes field mapping, structural, and geochronological research, along with the analysis of rock-magnetism and paleomagnetism of Tharandt Wald and Altenberg–Teplice calderas in the NW Bohemian Massif. The scientific outputs aim to create modern interpretations and a general geological model for the magmatism and tectonic processes closely related to and following the collapse of the Variscan orogen during the Upper Carboniferous.
Petr Vitouš: Influence of regional tectonics on dike swarms evolution beneath volcanics complexes
The research includes the structural study of rhyolite ignimbrites and associated subvolcanic igneous systems. A The research includes a structural study of rhyolite ignimbrites and associated subvolcanic igneous systems, in particular at the Altenberg–Teplice Caldera and Broumov ignimbrites (Bohemian Massif) and Gréixer rhyolite complex (Pyrenees). A combination of several methods will be used on these complexes: detailed field and structural mapping, rock magnetism, anisotropy of magnetic susceptibility (AMS), and paleomagnetism. This doctoral project aims to introduce modern interpretations and a general geological model of the influence of extensional regional tectonics on the geometry of feeding structures of volcanic complexes, and dynamics of emplacement of pyroclastic density currents. Last but not least, a comparative study of structure of basaltic to intermediate alkaline complexes of rift regions and felsic caldera volcanoes in collapsing orogens will be compiled.
Funded by the Charles University Grant Agency project No. 354821 to Petr Vitouš.
Tatiana Tkáčiková: Analog modeling of subduction zone processes
Magma and hydrothermal fluids percolate through the upper crust during all stages of collisional orogeny. A wide range of complex depositional, deformational, and metamorphic processes that operate along subduction zones may be experimentally reproduced under laboratory conditions. The Master research is focused on a critical evaluation of the existing experimental approaches and material parameters used to model subduction zone processes and evolution of accretionary wedges. Several pilot experiments will also be designed and interpreted in terms of geological processes during the second part of the project.
Funded by the Charles University Grant Agency project No. 260923 to Tatiana Tkáčiková
Jakub Ptáček: Genesis of rhyolite ignimbrite eruptive centers of the Křivoklát-Rokycany volcanic center
The bachelor thesis focuses on the rhyolite part of the Křivoklát-Rokycany volcanic center, which includes a spectrum of different facies from fine-grained welded to rheomorphic ignimbrites, through agglomerates, breccias, and deposits of block-and-ash flows to rhyolite lavas. The aim of the work is detailed geological mapping, petrography, and grain size and distribution analysis of rhyolite breccia clasts, agglomerates, and block-ash-flow deposits in the Těškov quarry and its vicinity. The expected result is the determination of the eruptive source of rhyolite ignimbrites on the southwestern edge of the complex.
Marek Rosol: Mechanisms of evolution of fracture patterns in the Cínovec granite host rocks
Intense lithium ore prospection is being conducted at the Cínovec deposit. The Teplice rhyolite (host rock), through which some of the potential entrance shafts will lead, shows different rheological properties as compared with the Cínovec granite and the greisen itself. The thesis is focused on the structural analysis of the fracture system around the Cínovec deposit. Such data may contribute to the debate on the mechanisms of the development of brittle structures in the vicinity of shallow granite plutons (tectonic vs. magmatic deformation) and help to evaluate the risks associated with mining at Cínovec.