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  • 1
    Call number: G 8241
    Type of Medium: Monograph available for loan
    Pages: 46 S.
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    International journal of earth sciences 77 (1988), S. 671-682 
    ISSN: 1437-3262
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Abstract Orthogneisses occurring in the core of the Orlica-Kłodzko dome, NE part of the Bohemian massif, exibit a penetrative, N-S stretching lineation defined by mostly ductile elongation of quartz and dilation of K-feldspar crystals of the former granite, now turned into quartz rods and variously elongated K-feldspar porphyroclasts. N-S stretching of the granite seems to be inconsistent with W-E tectonic transport shown by major folds and thrusts developing concurrently in its schistose envelope. The two major lithologies of the dome, differing in their fabrics and rheological properties, offered a drastically different response to an overall shortening. It is interpreted that folds due to buckling evolved in the mantle rocks and after a certain definite range of incremental shortening suffered extension parallel to their hinges. At that time the statistically isotropic granite body was subjected to the same N-S extension and was deformed in common with its schistose mantle under conditions of irrotational strain which represents an early but significant part of the protracted deformation history related to the granite-gneiss transformation.
    Abstract: Résumé Les orthogneiss qui constituent le coeur du dôme d'Orlica-kłodzko (région nord-est du massif de Bohème) présentent une linéation d'étirement pénétrative orientée nordsud. Cette linéation est exprimée principalement par l'allongement ductile en bâtonnets d'agrégats de quartz et par l'alignement de porphyroclastes de feldspath potassique. D'autre part, dans l'encaissant schisteux du granite, les grands plis et les charriages indiquent une direction ouest-est du transport tectonique, ce qui ne semble donc pas correspondre à la structure de l'orthogneiss central. Ce contraste est interprété par la différence entre les propriétés rhéologiques des deux ensembles lithologiques, qui ont répondu de manières différentes au processus de raccourcissement régional. Dans les roches de l'enveloppe, se sont formés d'abord des plis de courbure, jusqu'à un certain degré de raccourcissement, après quoi, ce processus n'étant plus possible, elles ont subi un étirement parallèle aux axes de ces plis. Le corps granitique isotrope, au contraire, a réagi dès le début par une extension nord-sud. Ces conditions de déformation irrotationnelle, à symétrie quasi-axiale, représentent un stade précoce, mais significatif de la transformation du granite en orthogneiss.
    Notes: Zusammenfassung Die Orthogneise, die im NE-Teil der Böhmischen Masse den Kern der Adlergebirge-Kłodzko-Kuppel bilden, zeigen eine N-S-ausgerichtete Streckungslineation. Die Streckungsfaser ist an plastisch gedehnten Quarz-Aggregaten zu erkennen sowie an Klastenzügen von Kalifeldspat. Große Falten und Überschiebungen in der Schieferhülle des Granits hingegen geben eine W-E Richtung des tektonischen Transports an. Diese entspricht nicht der Längung des Granits. Zur Deutung werden die unterschiedlichen rheologischen Eigenschaften des Granits und seiner Hüllgesteine herangezogen, die auf Unterschieden der Zusammensetzung und des Gefüges beruhen. Diese Unterschiede bewirken, daß die Hüllgesteine zunächst Biegefaltung erleben bis weitere Einengung durch Faltung unmöglich wird. Daraufhin werden die Hüllgesteine parallel zur Faltenachse in N-S-Richtung gedehnt. Diese Dehnungsrichtung ist allein und von Anfang an den isotropen Graniten überprägt. Die Deformation erfolgte irrotational und nahezu als achsialsymmetrische Streckung. Sie stellt ein frühes, aber wichtiges Stadium der Umwandlung dieses Granits zu Gneisen dar.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    International journal of earth sciences 82 (1993), S. 583-599 
    ISSN: 1437-3262
    Keywords: Saxothuringian zone ; Germany ; Poland ; Tectonometamorphism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The classical correlation by kossmat (1927) of the Saxothuringian belt of Germany with the West Sudetes of Poland is re-evaluated with special reference to the crystalline massifs of Munchberg and the Góry Sowie and the surrounding areas. Important common features are: Cambro-Ordovician magmatism and sedimentation; Silurian to Devonian radiolarian cherts in the low grade to unmetamorphosed units; Early Devonian (and older?) pressure-dominated metamorphism followed by rapid uplift; the incorporation of high pressure and mantle rocks; and Early Carboniferous mass flow deposits with ‘Saxothuringian’ clasts. Differing features in the West Sudetes are: tectonic contacts in and around the Góry Sowie are mostly subvertical and mainly (semi-)brittle (in contrast with subhorizontal and ductile contracts in the Münchberg); the Góry Sowie has undergone late re-equilibration of the earlier tectonic fabrics; an ophiolite juxtaposed with the Góry Sowie crystallized in (?) Devonian time and became only statically metamorphosed, as opposed to the regionally metamorphosed Cambro-Ordovician mafic rocks of the Saxothuringian belt; localized depocenters with Upper Devonian to Lower Permian elastic rocks relating to north-west trending strike-slip faults instead of the north-east trending cylindroidal foreland basin in the Saxothuringian. It is possible that the West Sudetes originated as an easterly continuation of the Saxothuringian belt, but then became involved, from the Late Devonian onwards, in a strike-slip system parallel with the margin of the East European Platform.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Studia geophysica et geodaetica 39 (1995), S. 302-308 
    ISSN: 1573-1626
    Keywords: Caledonides ; Variscides ; isotopic age
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary In central Europe, evidence for Cadomian basement occurs from the Midlands Massif in the United Kingdom to the Moesian Platform in Romania. The patchily exposed basement rocks either have survived almost intact through the Phanerozoic (e.g. Lusatia), overstepped by different Palaeozoic strata, or have been reworked to various degrees (e.g. Erzgebirge) and involved in Variscan structures (e.g. Sudetes, Moravia). In the Polish and German lowlands, undated subsurface basement occurs below the Permo-Mesozoic cover and Variscan molasse and flysch successions. The mutual relationships between the various Cadomian fragments occurring within and/or below the Palaeozoic, both orogenic and platform successions, are far from fully understood.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Studia geophysica et geodaetica 39 (1995), S. 354-363 
    ISSN: 1573-1626
    Keywords: Cadomides ; Caledonides ; Variscides ; Baltica ; Gondwana
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary Pre-Variscan basement in southern Poland is poorly exposed and thus known mostly from subsurface data. The availability of the latter is reviewed for terrains located between the Sudetes and the East European Platform. In these terrains the following relationships have been documented: Cadomian granitoids capped by Variscan flysch, Palaeozoic platform strata, Palaeozic folded and partly thermally altered successions, and low-grade metamorphic rocks overlain by Middle Cambrian strata. In view of their interrelationships the location of the Avalonia-Baltica suture in southeastern Poland is uncertain.
    Type of Medium: Electronic Resource
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  • 6
    Publication Date: 2002-01-01
    Description: The West Sudetes (NE margin of the Bohemian Massif) consist of a complex mosaic of several tectonometamorphic units juxtaposed during the Variscan orogeny. The polyphase Variscan tectonothermal development of the West Sudetes was determined by 40Ar/39Ar ages of single grains and mineral concentrates. Late Famennian (359 Ma) mica ages from the high-grade Gory Sowie Block suggest continuous uplift after a Late Devonian high temperature-low pressure (HT-LP) event contemporaneous with the end of subduction-related high pressure-low temperature (HP-LT) metamorphism in the East Krkono[s]e Complex. Mid-Late Devonian high pressure events in the Krkono[s]e-Jizera Terrane and Orlica-[S]nie[z]nik Dome are followed by coeval high temperature events between 345 and 335 Ma (Visean). The latter are interpreted as consequence of uplift, and decompression during overthrusting of both complexes on their forelands. Subsequent small- to large-scale shear movements dated at around 325-320 Ma (early Namurian) affected the Orlica-[S]nie[z]nik Dome, Krkono[s]e-Jizera Terrane, including the Intra-Sudetic Fault, and also the eastern Lusatian Granitoid Complex. They were accompanied by contemporaneous emplacement of the Krkono[s]e-Jizera pluton. The upper limit of the tectonometamorphic and magmatic activity is dated at 314-312 Ma (Namurian/Westphalian boundary). The final juxtaposition of the diversified tectonometamorphic units, which constitute the West Sudetes, took place in early Namurian times.
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  • 7
  • 8
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    In:  Geological Society Special Publication 201: 279-293.
    Publication Date: 2002-01-01
    Description: Tectonic zones and palaeogeographic units (terranes) in the German segment of the Variscides correlate with equivalents in the Sudetes at the NE margin of the Bohemian Massif. This correlation defines an arcuate structure with an opening angle of about 90{degrees}. The structure is truncated to the SE by a crustal scale. NE-trending fault zone with dextral transpression, the Moldanubian Thrust (MT). The arc cannot have been formed by northeastward indentation of the Bohemian Massif, since there is no evidence of a fault zone on the NW flank of the notional indenter, and little evidence for northeastward tectonic transport. Kinematic and age constraints on the main fault zones instead suggest that the structural array was formed by a complex sequence of events. Northwestward displacement along the margin of the East European Platform (EEP) with clockwise rotation was followed by large southwestward movements along the Moldanubian Thrust, and renewed northwestward displacement along the SW margin of the East European Platform.
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  • 9
    Publication Date: 2020-04-19
    Print ISSN: 1437-3254
    Electronic ISSN: 1437-3262
    Topics: Geosciences
    Published by Springer
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  • 10
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