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The Character of structural bond of loess
Fikar, Lukáš ; Rott, Josef (advisor) ; Herle, Vítězslav (referee)
5 Abstract This diploma thesis deals with nature of loess's structural bonds. Research part of the thesis aims to clarify types of bonding forces that interact between particles and what effect these forces have on overall strength of the loess. Next equally important objective was to resolve(clarify) what causes weakening of these bonding forces leading to reduction in soil volume, which may result in complete collapse of its entire structure. As part of the research, loess samples undergone significant amount of laboratory analyzes in order to expand knowledge about its grain size and mineral composition to achieve better understanding regarding behavioral mechanisms working inside the studied soil. Peak practical part experiment was performed as an analysis on loess samples during air pressure conditions and vacuum to determine which of the coupling forces have the most significant effect on the final strength of loess's structure. Keywords: loess, structural bonds, collapsible soils
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Thermobarometry of ultramafic rocks in ophiolites of the Vardar Zone in FYR Macedonia
Fikar, Lukáš ; Skála, Roman (advisor) ; Kallistová, Anna (referee)
This thesis is divided into review section followed by an experimental part. The first part focuses on geothermobarometry, illustrates its history and provides its detailed principles. Furthermore, it discusses various possibilities of the use of different mineral assemblages for purposes of thermometry and barometry. This part puts an emphasis on exchange reactions, the role of solvus in themometry, reactions based on weight transfers, and reactions involving gas phases. A chapter on Macedonian geography and regional geology provides a detailed description of the Vardar ophiolite belt, which was the source of the samples used in experimental part of the thesis, and its relationship toand other geological units in Macedonia, namely the Eastern Vardar Ophiolite zones, the Kopaonik unit, and the western part of the Vardar Ophiolite zone. Finally, a process of exsolution in subsolidus, which is impostant for the group of pyroxenes, is discussed. The area of interest is the use of the process of exsolution in thermometry. The thermodynamic conditions for exsolution are important features of the exsolution. The experimental part of the thesis includes a description of the samples and results of chemical analyses carried out with an electron probe microanalyzer. Chemical data were processed with two...
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