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Geologica Carpathica

The Journal of Geological Institute of Slovak Academy of Sciences

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Volume 64, Issue 2 (Apr 2013)

Issues

Kinematically unrelated C—S fabrics: an Lexample of extensional shear band cleavage from the Veporic Unit (Western Carpathians)

Zita Bukovská
  • Corresponding author
  • Institute of Petrology and Structural Geology, Faculty of Science, Charles University in Prague, Albertov 6, 128 43 Prague 2, Czech Republic
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  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Petr Jeřábek
  • Institute of Petrology and Structural Geology, Faculty of Science, Charles University in Prague, Albertov 6, 128 43 Prague 2, Czech Republic
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  • De Gruyter OnlineGoogle Scholar
/ Ondrej Lexa
  • Institute of Petrology and Structural Geology, Faculty of Science, Charles University in Prague, Albertov 6, 128 43 Prague 2, Czech Republic
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Jiří Konopásek
  • Department of Earth Science and Center for Geobiology, University of Bergen, Allégaten 41, N-5007 Bergen, Norway
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/ Marian Janák
  • Geological Institute, Slovak Academy of Sciences, Dúbravská cesta 9, P.O. Box 106, 840 05 Bratislava 45, Slovak Republic
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  • De Gruyter OnlineGoogle Scholar
/ Jan Košler
  • Department of Earth Science and Center for Geobiology, University of Bergen, Allégaten 41, N-5007 Bergen, Norway
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Published Online: 2013-05-04 | DOI: https://doi.org/10.2478/geoca-2013-0007

Abstract

Discontinuous and kinematically unrelated C-S fabrics have been recognized along the contact between the Gemeric and Veporic Units in the Western Carpathians. The formation of S and C fabrics within orthogneiss, quartzite and chloritoid-kyanite schist of the Veporic Unit is associated with Cretaceous syn-burial orogen-parallel flow and subsequent exhumational unroofing. The formation of the two fabrics characterized by distinct quartz deformation microstructure and metamorphic assemblage is separated by an inter-tectonic growth of transversal chloritoid-, kyanite-, ± monazite-bearing assemblage. The monazite U-Th-Pb concordia age of 97 ± 4 Ma was obtained by the laser ablation ICP-MS dating method. The age of this inter-tectonic metamorphic stage together with existing 40Ar/39Ar ages on exhumation of the Veporic Unit indicate that despite the similar appearance to shear bands or C-S mylonites there is a time span of at least 10 Myr between the formation of homogeneous S fabrics and superposed discrete C fabrics in the studied rocks

Keywords : Central Western Carpathians; Veporic Unit; structural geology; monazite dating; quartz deformation microstructure; shear band cleavage; discontinuous C-S fabrics

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Published Online: 2013-05-04

Published in Print: 2013-04-01


Citation Information: Geologica Carpathica, ISSN (Online) 1336-8052, ISSN (Print) 1335-0552, DOI: https://doi.org/10.2478/geoca-2013-0007.

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