A structural model for the western-central Sudetes; a deformed stack of Variscan thrust sheets

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doi: 10.1144/jgs.157.6.1155
Authors:Seston, Rosemary; Winchester, John A.; Piasecki, Marek A. J.; Crowley, Quentin G.; Floyd, Peter A.
Author Affiliations:Primary:
Keele University, School of Earth Sciences and Geography, Keele, United Kingdom
Volume Title:Journal of the Geological Society of London
Source:Journal of the Geological Society of London, Vol.157(Part 6), p.1155-1167. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649
Publication Date:2000
Note:In English. 45 refs.; illus., incl. block diags., strat. cols., 1 table, geol. sketch map
Summary:A model based on new structural and geochemical data is presented. It unifies the structural history of the Izera, Rudawy Janowickie and Kaczawa complexes with the Fore Sudetic block, despite their current separation by the Intra-Sudetic and Marginal Sudetic faults. Above the granitoid Izera, Kowary and Wadroze gneisses, at the base of the structural sequence, the ductile Kowary shear zone marks the basal decollement of the Swierzawa thrust sheet, comprising often highly strained metasediments associated with enriched tholeiitic and alkaline metabasites. Above it, the ductile Kaczorow shear zone, corresponding to the main mylonitic zone within the Leszczyniec shear zone in the Rudawy Janowickie Complex, marks the base of the Dobromierz thrust sheet, characterized by voluminous MORB-like meta-tholeiites and minor metasediments in the higher parts of the Rudawy Janowickie and Kaczawa complexes and the Pyszczynska Hill area of the Fore-Sudetic Block. In the east the Sleza ophiolite and the Gory Sowie Block override the entire nappe stack. Kinematic fabrics in the major and related shear zones indicate D1 compressional transport towards the northwest, followed by minor D2 extensional movements. The thrust stack was deformed during D3 by southwest verging folds, was subsequently intruded by post-orogenic granites, and later disrupted by the Intra-Sudetic, Marginal Sudetic and associated faults.
Subjects:Deformation; Extension tectonics; Faults; Metabasalt; Metaigneous rocks; Metamorphic core complexes; Metamorphic rocks; Orogeny; Paleozoic; Shear zones; Spectra; Tectonics; Thrust sheets; Variscan Orogeny; X-ray fluorescence spectra; Bohemian Massif; Central Europe; Europe; Sudeten Mountains; Izera Complex; Kaczawa Complex; Kowary Gneiss; Rudawy Janowickie Complex; Wadroze Gneiss
Coordinates:N495000 N510500 E0180000 E0145000
Abstract Numbers:01M/762
Record ID:2001026140
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
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