Reza Syahputra: Mechanisms and time scales of formation and accretion of ribbon continents
The Ph.D. project elaborates on the concept of ribbon terranes, narrow linear belts composed of juvenile or recycled crust that form by lithospheric extension of continental margins. The ribbon continents are of prime paleogeographic and plate-tectonic importance, now being increasingly recognized to play a crucial role in closure of oceanic domains, continental assemblies, growth of continental crust, large-magnitude strike-slip terrane displacements, and the development of oroclines. In its present stage, the Ph.D. research concentrates on formation and rift–drift transition of ribbon microplates using Cambrian sedimentary basins in the Bohemian Massif as a case example.
Funded by the Charles University Grant Agency project No. 952220 to Reza Syahputra.
Irena Olšanská: Late Variscan volcano-plutonic complexes as markers of evolution of post-orogenic tectonic processes
This Ph.D. project is focused on magmatic and tectonic processes associated with the late Variscan post-orogenic processes. Main methods are field mapping, structural, and geochronological analysis of selected volcano-plutonic complex, complemented by analysis of the anisotropy of magnetic susceptibility (AMS). Three case studies of interest are located in the NW part of the Bohemian Massif (Saxothuringian unit), in particular the Tharandt Wald caldera, Altenberg-Teplice caldera and Smrčiny/Fichtelgebirge batholith. The goal of this project is to interpret the late Variscan processes in these complexes, decipher their internal anatomy, and investigate interplay between dextral strike slip tectonics and dynamics of emplacement.
Funded by the Charles University Grant Agency project No. 124320 to Irena Olšanská.
Petr Vitouš: Magnetic anisotropy of the Teplice rhyolite: record of intracaldera ignimbrite flow, welding compaction, or rheomorphic fabric?
The Teplice rhyolite erupted from the Altenberg-Teplice caldera (northwestern Bohemian Massif) during the Late Carboniferous. At the present-day level, the Teplice rhyolite is preserved inside of the trapdoor caldera, and includes fall tuffs and variously welded ignimbrites with an estimated thickness of up to 1.5 km. The Master thesis focuses on dynamics of intra-caldera ignimbrite eruptions, flow, deposition and degree of welding. Based on the anisotropy of magnetic susceptibility (AMS), invisible magnetic fabrics will allow inferring ignimbrite flow directions, identification of possible eruptive centers, and determining relation of magnetic fabrics and welding or rheomorphic processes.
Tatiana Tkáčiková: Analog modeling of subduction zone processes
A wide range of complex depositional, deformational, and metamorphic processes that operate along subduction zones may be experimentally reproduced under laboratory conditions. The Bachelor 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.