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National Repository of Grey Literature 1 records found  Search took 0.01 seconds. 
Age of metamorphism and geodynamic evolution of Vepor Unit in the Central Western Carpathians
 Rajmonová, Eliška ; Jeřábek, Petr (advisor) ; Peřestý, Vít (referee)
Western Carpathians are characteristic for their complicated geological structure and uncertain tectogenesis. To understand the context of geological structure and evolution it is important to date the rock units and compare the results with geochemical analysis. The dating can bring results of the age of rocks or of their specific minerals. And because the minerals do not grow at the same time in the rocks, it is possible to date the exact event, which is connected with the growth of an exact mineral and with that connected structure. With respect to the results of dating and observing it is possible to create a model of geological evolution in the locality and support the idea of an exact geological period. The subject of this research is the Vepor Unit in the Central Western Carpathians. The dated rocks (orthogneiss and quartzite) contain garnets that are a product of metamorphosis and for that reason, the garnets are younger than the protolith. This research aims to find the age of the garnets and the age of the associated metamorphosis using the Lu-Hf method. Based on some older articles the age of metamorphosis is assumed to be on the boundary of the Lower and Upper Cretaceous. The research is also focused on the chemical composition of garnets and the macroscopical structure of the rocks...
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