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Crystallization kinetics of silicate melts
 Vrbenský, Adam ; Špillar, Václav (advisor) ; Trubač, Jakub (referee)
A process called crystallization is involved in the formation of most minerals and rocks on the Earth. This process further consists of two sub-processes, which are nucleation and growth of crystal. Crystallization is driven by kinetic factors which are still not fully understood. As it plays a significant role in global geological processes, it is very important to understand its mechanisms. The study of kinetic factors began in the 1970s and continues to some extent nowadays. The main aim of this work was to create an overview of available studies focusing on the crystal growth rate from a melt. Based on these studies, reliable kinetic data would be selected for creation of a general crystal growth rate model in the future. Data from the experiments that were performed under constant undercooling conditions and in which the growth rate remained constant (no influence of a diffusion or fractionation effects), were considered as a reliable source for a possible model. Relatively large amount of data is available for plagioclase only, with the growth rates ranging 10-6 -10-1 mm/s. Maximum plagioclase growth rates are generally reached at undercoolings from 100řC up to 200 řC, and it reaches the order of 10-3 -10-1 mm/s, depending on the system composition.
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