Strukturní a metamorfní vývoj severozápadní části krkonošsko-jizerského krystalinika (v okolí Lázní Libverda)
Structural and metamorphic evolution of the northwestern Krkonoše-Jizera Unit (in the surrounding Lázně Libverda)
Klíčová slova
Abstrakt
Northeastern part of the Krkonoše-Jizera Unit is built of orthogneisses with presence of elongated bodies of low- to marginally medium-grade metasedimentary rocks (phyllites to mica-schists), amphibolites and metamorphic felsic rocks of uncertain origin. Regional metamorphism and polyphase deformation in the northwestern Krkonoše-Jizera Unit took place during the Variscan orogeny. This metamorphic complex was intruded by high-K calc-alkaline granitoids of the Krkonoše-Jizera Pluton. Temperature and pressure conditions of regional metamorphism, which have been broadly associated with the formation of moderately NW dipping foliation and SW stretching lineation, were estimated at 530 - 617 °C and 6 - 7 kbar. Regionally metamorphosed rocks subsequently underwent younger contact metamorphism in thermal aureole of posttectonically emplaced body the Krkonoše-Jizera Pluton. This subsequent metamorphic event was associated with the formation of contact mineral assemblage indicating temperature in range between 541 and 685 °C and pressure around 3 kbar.
Soubory
Reference
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