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Deformation, metamorphism and metasomatism in the Gemer-Vepor Contact Zone in the Western Carpathians and the possible links to the Greywacke Zone in the Eastern Alps
Novotná, Nikol
The studied area extends from the Ochtiná Unit in Western Carpathians to the Veitsch Nappe Eastern Alps. The thesis represents a complex multidisciplinary work that combines the structural analysis, petrology and geochronology. The three main objectives of this thesis: reevaluation of the structure, deformation and metamorphic records, and original position of the Ochtiná Unit, understanding the distinct metasomatic processes recorded along the contact of two major units of the Central Western Carpathians - in the Gemer-Vepor Contact Zone - and their relation to distinct tectono-metamorphic events, testing the possible links between the Ochtiná Unit in the Gemer-Vepor Contact Zone of the Western Carpathians and the Veitsch Nappe in the Greywacke Zone of the Easten Alps, both well known for the Lower Carboniferous shale/schist sequence accompanied by the abundant presence of magnesite ore bodies. Keywords: Central Western Carpathians, Greywacke Zone, Ochtiná Unit, Veitsch Nappe, U-Pb zircon dating, Phase equilibrium modelling
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Deformation, metamorphism and metasomatism in the Gemer-Vepor Contact Zone in the Western Carpathians and the possible links to the Greywacke Zone in the Eastern Alps
Novotná, Nikol
The studied area extends from the Ochtiná Unit in Western Carpathians to the Veitsch Nappe Eastern Alps. The thesis represents a complex multidisciplinary work that combines the structural analysis, petrology and geochronology. The three main objectives of this thesis: reevaluation of the structure, deformation and metamorphic records, and original position of the Ochtiná Unit, understanding the distinct metasomatic processes recorded along the contact of two major units of the Central Western Carpathians - in the Gemer-Vepor Contact Zone - and their relation to distinct tectono-metamorphic events, testing the possible links between the Ochtiná Unit in the Gemer-Vepor Contact Zone of the Western Carpathians and the Veitsch Nappe in the Greywacke Zone of the Easten Alps, both well known for the Lower Carboniferous shale/schist sequence accompanied by the abundant presence of magnesite ore bodies. Keywords: Central Western Carpathians, Greywacke Zone, Ochtiná Unit, Veitsch Nappe, U-Pb zircon dating, Phase equilibrium modelling
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Deformation, metamorphism and metasomatism in the Gemer-Vepor Contact Zone in the Western Carpathians and the possible links to the Greywacke Zone in the Eastern Alps
Novotná, Nikol ; Jeřábek, Petr (advisor) ; Plašienka, Dušan (referee) ; Schuster, Ralf (referee)
The studied area extends from the Ochtiná Unit in Western Carpathians to the Veitsch Nappe Eastern Alps. The thesis represents a complex multidisciplinary work that combines the structural analysis, petrology and geochronology. The three main objectives of this thesis: reevaluation of the structure, deformation and metamorphic records, and original position of the Ochtiná Unit, understanding the distinct metasomatic processes recorded along the contact of two major units of the Central Western Carpathians - in the Gemer-Vepor Contact Zone - and their relation to distinct tectono-metamorphic events, testing the possible links between the Ochtiná Unit in the Gemer-Vepor Contact Zone of the Western Carpathians and the Veitsch Nappe in the Greywacke Zone of the Easten Alps, both well known for the Lower Carboniferous shale/schist sequence accompanied by the abundant presence of magnesite ore bodies. Keywords: Central Western Carpathians, Greywacke Zone, Ochtiná Unit, Veitsch Nappe, U-Pb zircon dating, Phase equilibrium modelling
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Metamorphic and structural record of the Gemer and Vepor Unit contact zone in the Central West Carpathians
Novotná, Nikol ; Jeřábek, Petr (advisor) ; Janák, Marian (referee)
The Central West Carpathians represents a crustal-scale thrust sheet stack formed by three major basement units, the Gemer, Vepor and Tatra. The basement of structurally middle Vepor Unit is dominated by Carboniferous granitoids while the upper Gemer Unit consists mainly of Lower Palaeozoic volcano-sedimentary complexes. Both units are overlain by Late Palaeozoic to Mesozoic cover sequences. During the Alpine orogenic event of Cretaceous age, the Vepor Unit was first buried during the northward overthrusting of the Gemer Unit and later exhumed during the eastward lateral escape of the Gemer. Alpine metamorphic conditions reached generally amphibolite facies conditions in the Vepor and greenschist facies conditions in the Gemer. In this work we concentrate on tectono-metamorphic record within the rock complexes incorporated into the imbricated structure of the Vepor-Gemer Contact Zone. The Vepor basement schists were affected by Variscan and Alpine regional metamorphism of medium grade. The age of metamorphism was confirmed by the Sm/Nd garnet dating (355±41 Ma - Variscan, 115±24 Ma -Alpine). The Variscan metamorphic assemblage of garnet-biotite-plagioclase is mainly preserved closer to the contact with leucogranite which crosscuts Variscan metamorphic fabric. The schists and leucogranite are...
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