Abstract
This paper presents new structural, anisotropy of magnetic susceptibility (AMS), and petrological data in tandem with existing geochronological data to determine a polyphase Variscan tectonometamorphic event in the southwestern Moldanubian Zone of the Bohemian Massif. The high-grade metamorphic rocks of this Zone underwent the successive tectonometamorphic evolution (from ca. 360 to 310 Ma) that portrays three main geodynamic episodes: (a) The collisional to exhumation episode (ca. 360–335 Ma) recorded by the relict, steeply dipping, and ~ N(NNE) to S(SSW) striking foliation planes (S1) developed at temperatures of 720–754 °C and pressures of ca. 790 MPa (M1) and superimposed flat-lying foliation planes (S2) under temperatures of 674 ± 27 °C and pressures of 680 ± 110 MPa (M2). (b) The late-orogenic ~ N–S oriented shortening (ca. 335–325 Ma) controlled by convergence of a crustal segment derived from the Gondwana continent (newly named as the “Salzburgia Block) and the mostly consolidated Bohemian Massif. These collisional processes resulted in superimposition of the foliation planes (S3) dipping steeply to moderately to the ~ N to ~ NNE(NE), re-heating and metamorphic overprint at temperatures of 770–830 °C and pressures of 450–530 MPa (M3) and syn-tectonic emplacement of the numerous late-orogenic granitoids. (c) Subsequently, the switch in the paleostress regime from ~ N–S shortening to that of late-orogenic ~ ENE–WSW extension (ca. 325–310 Ma) led to the activation of regional right-lateral transtension and exhumation of the deep-seated rocks. Associated re-equilibration proceeded under temperatures of 662–701 °C and pressures of 362–437 MPa (M4 event). In the latter stages of this episode, the synchronous reactivation of the regional ~ NW–SE striking right-lateral shear zones (Pfahl and Danube) and the almost perpendicular ~ NNE(NE)–SSW(SW) striking left-lateral shear zones took place.
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Acknowledgements
The research was funded by the Czech Science Foundation (Grant No. 15-34621L) to K. Verner; the Charles University Ph.D. STARS Programme and the Centre for Geosphere Dynamics (UNCE/SCI/006) to L. Megerssa; the Charles University projects cooperation programme (Research Area GEOL), the Czech Academy of Sciences institutional support No. RVO67985831 and the postdoctoral fellowship No. L100131601, and the ÖeAD AKTION fellowship No. ICM-2016-03570 to F. Tomek. We greatly acknowledge the fruitful discussions with Prof. Jiří Žák and Prof. Fritz Finger during the fieldwork and data interpretation. The valuable reviews by Prof. Gernold Zulauf and Prof. Jiří Konopásek as well as the welcoming approach of the Editor-in-Chief Prof. Ulrich Riller have greatly helped to improve the original manuscript.
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531_2022_2258_MOESM2_ESM.xlsx
Supplementary file2 SI Tab. 1 List of specimens analyzed for AMS from the southwestern Moldanubian Unit, the Bavarian Unit, and the Pfahl and Danube Shear Zones (XLSX 276 KB)
531_2022_2258_MOESM3_ESM.xlsx
Supplementary file3 SI Tab. 2 Mineral compositions and recalculation methods. Mineral analyses were performed on the Cameca SX-100 electron microprobe at the Department of Geological Sciences, Faculty of Science, Masaryk University in Brno, Czech Republic. The measurements were carried out in a wave dispersion mode under the following conditions: 15 kV acceleration voltage, 5 μm electron beam diameter, 30 nA current and 20 s integration time. Augite (Si, Mg), orthoclase (K), jadeite (Na), chromite (Cr), almandine (Al), andradite (Fe, Ca), rhodonite (Mn), and TiO (Ti) were used as standard. The chemical formulae of feldspars were recalculated to 8 oxygen atoms and of micas to 22 oxygen atoms. The chemical formulas of garnet were obtained on the basis of 12 oxygen atoms. Ferric iron is recalculated based on charge balance and stoichiometry. The empirical formulae of cordierite were calculated on the basis of 18 oxygen atoms and of ilmenite on the basis of 18 oxygen atoms (XLSX 49 KB)
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Megerssa, L., Verner, K., Buriánek, D. et al. The late-Variscan high-temperature collisional episode in the southwestern Moldanubian Zone (Bohemian Massif). Int J Earth Sci (Geol Rundsch) 112, 631–658 (2023). https://doi.org/10.1007/s00531-022-02258-2
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DOI: https://doi.org/10.1007/s00531-022-02258-2