National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Kinematic record of Jurassic obduction of oceanic crust in the West Carpathians
Čermák, Vojtěch ; Jeřábek, Petr (advisor) ; Vojtko, Rastislav (referee)
English abstract The bachelor thesis is focussed on problems of Jurassic subduction of Meliatic ocean in the region of the Western Carpathians. This oceanic domain opened during the Middle Triasic and closed at the end of Middle Jurassic. The existence of the oceanic domain in the Western Carpathians is documented by sedimentary rocks of oceanic origin glaucophane bearing basalts and serpentinized ultramafic rocks preserved in the area of the presumed suture zone. The chemical composition of metabasalts corresponds to the transition between the basalts of mid-oceanic ridges and basalts of island arcs. The metabasalts underwent high-pressure, low- temperature metamorphism, which proves their drag into to substantial depths during subduction and were later exhumed to structurally lower parts of the accretionary wedge. The research was focussed on identification of deformation record in units of the southern Gemeric Superunit, Meliata Unit (Borka Nappe) and Silicic Nappe. Four deformation events D1 - D4 were identified on the basis of structural analysis in the studied area. Deformation events D1 - D3 show distinct record in different units and are associated with roughly east- west direct of compression connected with the subduction of Meliatic oceanic plate, exhumation of its parts into an accretion complex...
Kinematic record of Jurassic obduction of oceanic crust in the West Carpathians
Čermák, Vojtěch ; Jeřábek, Petr (advisor) ; Vojtko, Rastislav (referee)
English abstract This thesis is specialised in problems of Jurassic subduction of meliatic oceanic area in the region of the Western Carpathians. This oceanic basin opened during middle trias and closed during middle Jurassic. Sedimentary rocks of oceanic origin and glaukofanitised basalts in the area of the presumed suture zone prove the existence of this oceanic basin. Metabasalts, whose chemism corresponds with the transitional composition between the basalts of mid-oceanic rifts and those of island arc, underwent high-pressure, low- temperature metamorphosis, which proves their being pulled to substantial depth during the subduction and later exhumed to lower parts of accretionary wedge. The practical part of this thesis is aimed at presentation of data gained from measurements of crystallographic orientation of calcite grains in marble appearing together with metabasalts in the Bôrka nappe. Key words: Western Carpathians; Bôrka nappe; Turnaicum; Silicic nappe; subduction; suture

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1 Vojtko, Roman
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