ISSN
print 2570-7337
online 2570-7345
Structural and metamorphic evolution of the northwestern Krkonoše-Jizera Unit (in the surrounding Lázně Libverda)
Keywords
Abstract
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.
Files
References
Alexandrowski P., Mazur S. (2002) Collage tectonics in the northeasternmost part of the Variscan Belt: the Sudetes, Bohemian Massif, in Palaeozoic amalgamation of Central Europe. Geol. Soc. London, Spec. Publ., Vol. 201, (J. A. Wichester et al., eds), 237-277.
Domečka K. (1970) Pre-Variscan granitoids of the West Sudetes. Sbor. geol. Věd 18, 161-189.
Faryad S. W., Kachlík V. (2013) New evidence of blueschist facies rocks and their geotectonic implication for Variscan suture(s) in the Bohemian Massif. J. metam. Geol. 31(1), 63-82.
Fila-Wójcicka E. (2004) Rb-Sr isotope studies in the Garby Izerskie zone - evidence for the Karkonosze intrusion activity. Mineral. Soc. Pol., Spec. Pap. 24, 153-156.
Henry D. J., Guidotti C. V., Thomson J. A. (2005) The Ti-saturation surface for low-to-medium pressure metapelitic biotite: Implications for Geothermometry and Ti-substitution Mechanisms. Am. Mineral. 90, 316-328.
Hladil J., Patočka F., Kachlík V., Melichar R., Hubačík M. (2003) Metamorphosed carbonates of Krkonose Mountains and Paleozoic evolution of Sudetic terranes (NE Bohemia, Czech Republic). Geol. Carpath. 54, 5, 281-297.
Holdaway M. J. (1971) Stability of andalusite and the aluminum silicate phase diagram. Amer. J. Sci. 271, 97-131.
Holland T. J. B., Blundy J. D. (1994) Non-ideal interactions in calcic amphiboles and their bearing on amphibole-plagioclase thermometry. Contrib. Mineral. Petrol. 116, 433-447.
Holland T. J. B., Powell R. (1998) An internally consistent thermodynamic data set for phases of petrological interest. J. metam. Geol. 16, 309-343.
Horný R. (1964) Noví graptoliti z metamorfovaného siluru Podkrkonoší. Čas. Nár. Muz., Odd. přírodověd. 133, 4, 244.
Cháb J., Vrána S. (1979) Crossite-actinolite amphiboles of the Krkonoše-Jizera crystalline complex and their geological significance. Věst. Ústř. Úst. geol. 54, 143-150.
Chaloupský J., Červenka J., Jetel J., Králík F., Líbalová J., Píchová E., Pokorný J., Pošmourný K., Sekyra J., Shrbený O., Šalanský K., Šrámek J., Václ J. (1989) Geologie Krkonoš a Jizerských hor. Ústř. Úst. geol., Praha, 288 s.
Chlupáč I., Hladil J. (1992) New Devonian occurences in the Ještěd Mts. North Bohemia. Čas. Mineral. Geol. 37, 3, 185-191.
Ilnicki S. (2000) Genesis of amphibole rocks and metabasites from the Stara Kamienica belt and from selected adjoining parts of the Izera block. MS, PhD thesis, Warsaw University, 265 pp. (polsky).
Ilnicki, S. (2011) Variscan prograde P-T evolution and contact metamorphism in metabasites from the Sowia Dolina, Karkonosze-Izera massif, SW Poland. Mineral. Mag. 75, 185-212.
Kachlík V., Patočka F. (1998) Cambrian/Ordovician intracontinental rifting and Devonian closure of the rifting generated basins in the Bohemian Massif realms. Acta Univ. Carol., Geol. 42, 3-4, 433-441.
Kachlík V., Patočka F., Fajst M. (2002) Sheared metagranitoids in the Ještěd Mts. the role in the westward propagation of the Variscan orogenic Wedge in the West Sudetes. Geolines 14, 43-44.
Kröner A., Jaeckel P., Hegner, E., Opletal M. (2001) Single zircon ages and whole-rock Nd isotopic systematics of early Palaeozoic granitoid gneisses from the Czech and Polish Sudetes (Jizerské hory, Krkonoše and Orlice-Sněnik Complex). Int. J. Earth Sci. 90, 304-324.
Kryza R., Mazur S. (1995) Contrasting metamorphic paths in the SE part of the Karkonosze-Izera Block (Western Sudetes, SW Poland). Neu. Jb. Mineral., Abh. 169, 157-192.
Maluski H., Patočka F. (1997) Geochemistry and 40Ar/39Ar geochronology of the mafic metavolcanic rocks from the Rýchory Mountains complex (west Sudetes, Bohemian Massif): palaeotectonic significance. Geol. Mag. 134, 703-716.
Marheine D., Kachlík V., Maluski H., Patočka, F., Żelaźniewicz A. (2002) The Ar-Ar ages from the West Sudetes (NE Bohemian Massif): constraints on the Variscan polyphase tectonothermal development. In.: Winchester J., Pharaoh T., Verniers J.,eds), Palaeozoic amalgamation of the Central Europe. Geol. Soc. London, Spec. Publ., 133-155.
Mazur S. (1995) Structural and metamorphic evolution of the country rocks at the eastern contact of the Karkonosze granite in the southern Rudawy Janowickie Mts and Lasocki Range (in Polish with English summary). Geol. Sudetica 29, 31-98.
Mazur S. (2002) Geology of the Karkonosze - Izera Massif: an overview. Mineral. Soc. Pol., Spec. Pap. 20, 22-34.
Mazur S., Aleksandrowski P., Kryza R., Oberc-Dziedzic T. (2006) The Variscan Orogen in Poland. Geol. Quarterly 50(1), 89-118.
Oberc-Dziedzic T., Kryza R., Mochnacka K., Larionov A. (2010) Ordovician passive continental margin magmatism in the Central-European Variscides: U-Pb zircon data from the SE part of the Karkonosze-Izera Massif, Sudetes, SW Poland. Int. J. Earth Sci. 99(1), 27-46.
Patočka F., Fajst M., Kachlík V. (2000) Mafic-felsic to mafic-ultramafic Early Palaeozoic magmatism of the West Sudetes (NE Bohemian Massif): the South Krkonoše Complex. Z. geol. Wiss. 28, 1-2, 177-210.
Patočka F., Pivec E., Oliveriová D. (1996) Mineralogy and petrology of mafic blueschists from the Rýchory Mts. Crystalline Complex (West Sudetes, Bohemian Massif). Neu. Jb. Mineral., Abh. 170, 313-330.
Pattison D. R. M. (1992) Stability of andalusite and sillimanite and the Al2SiO5 triple point: Constraints from the Ballachulish aureole, Scotland. J. Geol. 100(4), 423-446.
Powell R., Holland T. (1994) Optimal geothermometry and geobarometry. Am. Mineral. 79, 120-133.
Seston R., Winchester J. A., Piasecki M. A. A., Crowley Q. G., Floyd P. A. (2000) A structural model for the western-central Sudetes: a deformed stack of Variscan thrust sheets. J. Geol. Soc. London 157, 1155-1167.
Schumacher J. C. (1996) The estimation of the proportion of ferric iron in the electron-microprobe analysis of amphiboles. Can. Mineral. 34, 238-246.
Spear F. S., Kohn M. J., Cheney J. T. (1999) P-T paths from anatectic pelites. Contrib. Mineral. Petrol. 134, 17-32.
Šída P., Kachlík V. (2009) Geological setting, petrology and mineralogy of metabasites in a thermal aureole of Tanvald granite (northern Bohemia) used for the manufacture of Neolithic tools. J. Geosci. 54(3), 269-87.
Verner K., Mrázová Š. (red.) (2013) Základní geologická mapa České republiky 1 : 25 000 s Vysvětlivkami 03-142 Hejnice a 03-231 Jizerka. MS, Česká geologická služba, Praha.
Whitney D. L., Evans B. W. (2010) Abbreviations for names of rock-forming minerals. Amer. Mineral. 95(1), 185-187.
Źaba J. (1984) Genesis and metamorphic evolution of gneisses and granitoids of the Izerski Stóg massif (Western Sudetes). Geol. Sudet. 19, 89-192 (polsky).
Żelaźniewicz A. (1997) The Sudetes as a Palaeozoic orogen in central Europe. Geol. Mag. 134, 691-702.
Żelaźniewicz A., Nowak I., Achramowicz S., Czapliński W. (2003) The northern part of the Izera-Karkonosze Block: a passive margin of the Saxothuringian terrane. In.: Ciezkowski A., Wojewoda J., Żelaźniewicz A. (eds), Sudety Zachodnie: od wendu do czwartorzedu, 17-32. WIND, Wrocław, Poland (polsky).
Zelaźniewicz et al. (2009) chybí citace v literatuře
Žáčková E., Konopásek J., Jeřábek P., Finger F., Košler J. (2010) Early Carboniferous blueschist facies metamorphism in metapelites of the West Sudetes (northern Saxothuringian Domain, Bohemian Massif). J. metam. Geol. 28, 361-379.
Žák J., Verner K., Sláma J., Kachlík V., Chlupáčová M. (v tisku) Multistage magma emplacement and progressive strain accumulation in the shallow-level Krkonoše-Jizera plutonic complex, Bohemian Massif. Tectonics, doi:10.1002/tect.20088.