Journal : Acta Geologica Polonica
Article : Quartz c-axis fabrics in constrictionally strained orthogneisses: implications for the evolution of the Orlica-Śnieżnik Dome, the Sudetes, Poland

Authors :
Kennedy, W. J.
Oxford University Museum of Natural History, Parks Road, Oxford OX1 3PW and Department of Earth Sciences, Parks Road, Oxford OX1 3AN, United Kingdom, jim.kennedy@oum.ox.ac.uk,
Walaszczyk, I.
Faculty of Geology, University of Warsaw, Al. Żwirki i Wigury 93, PL-02-089 Warszawa, Poland, i.walaszczyk@uw.edu.pl,
Kopaevich, L.
Geological Faculty, Lomonosov Moscow State University, Leninskie gory, Moscow, 119991 Russia,
Beniamovski, V. N.
Geological Institute, Russian Academy of Sciences, Pyzhevski 7, Moscow, 119017, Russia,
Wilmsen, M.
Senckenberg Naturhistorische Sammlungen Dresden, Museum für Mineralogie und Geologie, Sektion Paläozoologie, Königsbrücker Landstr. 159, D-01109 Dresden, Germany, markus.wilmsen@senckenberg.de,
Storm, M.
Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, United Kingdom,
Fürsich, F.
GeoZentrum Nordbayern, Fachgruppe PaläoUmwelt, Friedrich-Alexander-Universität Erlangen-Nürnberg, Loewenichstr. 28, D-91054 Erlangen, Germany,
Majidifard, M.
Geological Survey of Iran, Box 131851-1494, Tehran, Iran,
Gasiński, M. A.
Institute of Geological Sciences, Jagiellonian University, Oleandry 2a, PL-30-063 Kraków, Poland, adam.gasinski@uj.edu.pl,
Olshtynska, A.
Institute of Geological Sciences, National Academy of Sciences of Ukraine, O. Gonchara str. 55-b, 01601 Kiev, Ukraine, ol-lesia@mail.ru,
Uchman, A.
Institute of Geological Sciences, Jagiellonian University, Oleandry 2a, PL-30-063 Kraków, Poland, alfred.uchman@uj.edu.pl,
Kennedy, W. J.
Oxford University Museum of Natural History, Parks Road, Oxford OX1 3W and Department of Earth Sciences, Parks Road, Oxford OX1 3AN, United Kingdom, jim.kennedy@oum.ox.ac.uk,
Klinger, H.
Natural History Collections Department, Iziko South African Museum, P. O. Box 61, Cape Town, 8000, Republic of South Africa, hkling@telekomsa.net,
Machalski, M.
Institute of Paleobiology, Polish Academy of Sciences, ul. Twarda 51/55, PL-00-818 Warszawa, Poland, mach@twarda.pan.pl,
Kennedy, W. J.
Oxford University Museum of Natural History, Parks Road, Oxford, OX1 3PW, United Kingdom, jim.kennedy@oum.ox.ac.uk,
Schneider, S.
CASP, University of Cambridge, West Building, 181A Huntingdon Road, Cambridge, CB3 0DH, UK and GeoZentrum Nordbayern, Paleobiology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Loewenichstr. 28, 91054 Erlangen, Germany, simon.schneider@casp.cam.ac.uk,
Jäger, M.
Lindenstr. 53, 72348 Rosenfeld, Germany, langstein.jaeger@web.de,
Kroh, A.
Natural History Museum Vienna, Geology-Palaeontology, Burgring 7, 1010 Wien, Austria, andreas.kroh@nhm-wien.ac.at,
Mitterer, A.
Hoffmann Mineral GmbH, Münchener Str. 75, 86633 Neuburg an der Donau, Germany, agnes.mitterer@sonax.de,
Niebuhr, B.
Senckenberg Naturhistorische Sammlungen Dresden, Museum für Mineralogie und Geologie, Paläozoologie, Königsbrücker Landstr. 159, 01109 Dresden, Germany, niebuhr.birgit@googlemail.com,
Vodrážka, R.
Academy of Sciences of the Czech Republic, Institute of Geology, Rozvojová 269, 16502 Praha 6, Czech Republic, radek.vodrazka@seznam.cz,
Wilmsen, M.
Senckenberg Naturhistorische Sammlungen Dresden, Museum für Mineralogie und Geologie, Paläozoologie, Königsbrücker Landstr. 159, 01109 Dresden, Germany, markus.wilmsen@senckenberg.de,
Wood, C. J.
Scops Geological Services Ltd., 31 Periton Lane, Minehead, Somerset TA24 8AQ, UK, chrisjwood@btinternet.com,
Zágoršek, K.
Department of Paleontology, National Museum, Vaclavske nam. 68, 11579 Praha 1, Czech Republic, kamil_zagorsek@nm.cz,
Jurkowska, A.
Institute of Geological Sciences, Jagiellonian University, Oleandry 2a; 30-063 Kraków, Poland, jurkowska.a@gmail.com,
Uchman, A.
Institute of Geological Sciences, Jagiellonian University, Oleandry 2a; 30-063 Kraków, Poland, alfred.uchman@uj.edu.pl,
Kennedy, W. J.
Oxford University Museum of Natural History, Parks Road, Oxford OX1 3W and Department of Earth Sciences, Parks Road, Oxford OX1 3AN, United Kingdom, jim.kennedy@oum.ox.ac.uk,
Walaszczyk, I.
Faculty of Geology, University of Warsaw, Al. Żwirki i Wigury 93, PL-02-089 Warszawa, Poland,
Gale, A.
Department of Earth and Environmental Sciences, University of Portsmouth, Portsmouth PO1 3QL. United Kingdom,
Dembicz, K.
Spirifer Geological Society, Warszawa, Poland,
Praszkier, T.
Spirifer Geological Society, Warszawa, Poland,
Fedorowski, J.
Institute of Geology, Adam Mickiewicz University, Maków Polnych 16, Pl-61-606 Poznań, Poland, jerzy@amu.edu.pl,
Kullmann, J.
Mathematisch-Naturwissenschaften Faculty, Geowissenschaften University, Tübingen, Hölderlinstrasse 12, Germany, juergen.kullmann@uni-tuebingen.de,
Kochman, A.
AGH University of Science and Technology, Faculty of Geology, Geophysics and Environment Protection, Al. A. Mickiewicza 30; 30-059 Kraków, Poland, kochman@geol.agh.edu.pl,
Matyszkiewicz, J.
AGH University of Science and Technology, Faculty of Geology, Geophysics and Environment Protection, Al. A. Mickiewicza 30; 30-059 Kraków, Poland, jamat@geol.agh.edu.pl,
Żelaźniewicz, A.
Instytut Nauk Geologicznych PAN, Podwale 75, PL-50-449 Wrocław, Poland, pansudet@pwr.wroc.pl,
Kromuszczyńska, O.
Instytut Nauk Geologicznych PAN, Podwale 75, PL-50-449 Wrocław, Poland, olga.kromuszczynska@twarda.pan.pl,
Biegała, N.
Instytut Geologii UAM, Maków Polnych 16, PL-61-606 Poznań, Poland,
Abstract : The Orlica-Śnieżnik Dome (OSD), NE Bohemian Massif, contains in its core several gneiss variants with protoliths dated at ~500 Ma. In the western limb of the OSD, rodding augen gneisses (Spalona gneiss unit) are mainly L>S tectonites with a prominent stretching lineation. The few quartz LPO studies have produced somewhat discrepant results. Reexamination of these rocks revealed that texture formation was a protracted, multistage process that involved strain partitioning with changing strain rate and kinematics in a general shear regime at temperatures of the amphibolite facies (450–600°C). Quartz c-axis microfabrics show complex yet reproducible patterns that developed under the joint control of strain geometry and temperature; thus the LPOs are mixed features represented by pseudogirdle patterns. Domainal differences in quartz microfabrics (ribbons, tails, quartzo-feldspathic aggregate) are common in the Spalona orthogneisses but uncommon in the sheared migmatitic gneisses. In the latter rocks, the constrictional strain was imposed on the originally planar fabric defined by high-temperature migmatitic layering. The constrictional fabric of the Spalona gneisses may have developed in the hinge zones of kilometer-scale folds, where the elongation occurred parallel to the fold axes. Other occurrences of rodding gneisses throughout the Orlica-Śnieżnik Dome are thought to occupy similar structural positions, which would point to the significance of large-scale folds in the tectonic structure of the dome.

Keywords : Masyw Czeski, kurczenie, gnejs, quartz c-axis, constriction, Augen orthogneiss, microfabric, Stretching Lineation, rodding gneiss, pseudo-girdle, Bohemian Massif,
Publishing house : Faculty of Geology of the University of Warsaw
Publication date : 2013
Number : Vol. 63, no. 4
Page : 697 – 722

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DOI :
Qute : Kennedy, W. J. ,Walaszczyk, I. ,Kopaevich, L. ,Beniamovski, V. N. ,Wilmsen, M. ,Storm, M. ,Fürsich, F. ,Majidifard, M. ,Gasiński, M. A. ,Olshtynska, A. ,Uchman, A. ,Kennedy, W. J. ,Klinger, H. ,Machalski, M. ,Kennedy, W. J. ,Schneider, S. ,Jäger, M. ,Kroh, A. ,Mitterer, A. ,Niebuhr, B. ,Vodrážka, R. ,Wilmsen, M. ,Wood, C. J. ,Zágoršek, K. ,Jurkowska, A. ,Uchman, A. ,Kennedy, W. J. ,Walaszczyk, I. ,Gale, A. ,Dembicz, K. ,Praszkier, T. ,Fedorowski, J. ,Kullmann, J. ,Kochman, A. ,Matyszkiewicz, J. ,Żelaźniewicz, A. ,Kromuszczyńska, O. ,Biegała, N. ,Biegała, N. , Quartz c-axis fabrics in constrictionally strained orthogneisses: implications for the evolution of the Orlica-Śnieżnik Dome, the Sudetes, Poland. Acta Geologica Polonica Vol. 63, no. 4/2013
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