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Intrusive and Deformation History of the Ševětín Pluton, Moldanubian Batholith: Record of Polyphase Tectonic Evolution of the Blanice Graben, Bohemian Massif

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Intrusive and Deformation History of the Ševětín Pluton, Moldanubian Batholith: Record of Polyphase Tectonic Evolution of the Blanice Graben, Bohemian Massif Journal of Geosciences, 59 (2014), 441–456 DOI: 10.3190/jgeosci.175 Original paper Intrusive and deformation history of the Ševětín Pluton, Moldanubian Batholith: record of polyphase tectonic evolution of the Blanice Graben, Bohemian Massif Jiří ZacharIáš1*, Jakub Trubač2 1 Institute of Geochemistry, Mineralogy and Mineral Resources, Faculty of Science, Charles University in Prague, Albertov 6, 128 43 Prague 2, Czech Republic; [email protected] 2 Czech Geological Survey, Klárov 3, 118 21 Prague 1, Czech Republic * Corresponding author The Ševětín Pluton, located c. 15 km NNE of České Budějovice, is a small, isolated, petrologically and structurally complex intrusive body that is genetically related to the youngest intrusions of the Moldanubian Batholith. As docu- mented in this study, its overall shape, internal magmatic fabric as well as brittle structures (dikes, veins, joints, faults) are, however, related to the formation and polyphase tectonic evolution of the Blanice Graben, an about 200 km long and 5–15 km wide NNE–SSW-trending, deep-seated fault zone that cuts across the Moldanubian Unit. In total, one pre-intrusive and three syn- to post-intrusive tectonic phases have been distinguished. The oblique, NW–SE oriented compression controlled both the intrusion of the Ševětín biotite–muscovite granite and the early stage of its brittle deformation. Sigmoidal pattern of magnetic foliations in this pluton documents its mostly solid-state deforma- tion during oblique sinistral movements on the main faults of the Blanice Graben. The subsequent strike-slip phase was characterized by E–W oriented subhorizontal extension and can be correlated with the intrusion of c. 270 Ma old microgranodiorite dikes. The last extensional phase was associated with the formation of subeconomic Pb–Zn–(Ag?) quartz–calcite veins at c. 265 Ma. Keywords: Moldanubian Zone, Moldanubian Batholith, Blanice Graben, paleostress analysis, AMS study, Pb–Zn veins Received: 20 February 2014; accepted: 3 October 2014; handling editor: J. Žák The online version of this article (doi: 10.3190/jgeosci.175) contains supplementary electronic material. 1. Introduction southern parts of the c. 200 km long and NNE–SSW- trending Blanice Graben in the core of the Bohemian Extensional tectonics associated with late-orogenic Massif. Its formation documents the final stages of oro- evolution of collisional orogens is often coupled with genic collapse associated with the formation of linear extensive crustal melting and subsequent granitic magma Permo–Carboniferous sedimentary basins, as well as emplacement into the middle to upper crustal levels. with repeated magmatic and hydrothermal activity. In Simultaneously, large-scale shear zones are formed in all these aspects, the Blanice Graben resembles simi- the continental crust to accommodate its stretching (e.g. lar tectonic zones of Variscan Europe. Our goal was Malavieille 1993; Faure 1995). At late stages of this achieved through a detailed study of the magmatic and scenario, shallow crustal levels are dominated by brittle solid-state deformational fabrics of the Ševětín Pluton, tectonics and by formation tectonically-controlled sedi- a small intrusion genetically related to the Moldanubian mentary basins. Batholith. Granitic bodies emplaced in tectonically active zones can be used both as passive and active markers of crustal deformation, but also have the potential of dating these 2. Regional setting processes. Anisotropy of magnetic susceptibility (AMS) is a widely used method for analysis of cryptic magmatic Moldanubian Zone (Fig. 1a) represents a heterogeneous to solid-state deformational fabrics in such granitoid assemblage of medium- to high-grade metamorphic rocks. Moreover, the paleostress orientation and stress rocks, mainly paragneisses and migmatites, locally with ratio can be inferred from examining mode-I fractures calcareous, graphitic and metabasic intercalations as well (dikes, veins, joints), as well as from interpretation of as bodies of granulite, eclogite and serpentinite (e.g. Fiala striations (slickenlines) along fault planes. et al. 1995). It is usually subdivided into the lower crust- This study focuses on the identification of tectonic al/upper mantle Gföhl Unit with numerous occurrences of regimes that controlled the evolution of central and HP–HT granulite (e.g. Racek et al. 2006; Janoušek and www.jgeosci.org Jiří Zachariáš, Jakub Trubač Holub 2007; Franěk et al. 2011) and eclogite (e.g. Me- In the northern (Czech) part of the Rödl fault zone, daris et al. 2005) massifs and into the medium-pressure Vrána and Bártek (2005) found indicators of sinistral mid-crustal Drosendorf and Ostrong units (Dallmeyer displacement ~17 km south of Kaplice. The early ductile et al. 1995; Franke 2000). Recent structural studies phase of this deformation is constrained to 303 ± 5 Ma documented that many of the high-pressure lithologies by Ar–Ar dating of hornblende from a quartz diorite within the Gföhl Unit represent vertical extrusions of porphyry dike (Vrána et al. 2005) that intruded syn- lower crustal rocks (e.g. Finger et al. 2007; Franěk et kinematically during the development of the mylonitic al. 2011; Schulmann et al. 2014). The granulite-facies fabric in the fault/shear zone. metamorphism occurred at about 340 Ma (e.g. Friedl et A late stage of tectonomagmatic activity in the Blan- al. 2011), followed by rapid exhumation to mid-crustal ice Graben is indicated by the 270 ± 2 Ma Ar–Ar age levels (c. 338–335 Ma) and subsequent nearly isobaric of hornblende from a pyroxene microgranodiorite dike cooling through ~300 °C between c. 320–310 Ma (e.g. near Dehetník (Fig. 1a; Košler et al. 2001). The parental Matte et al. 1985). magma of this dike originated from mixing between re- The Moldanubian Batholith (or South Bohemian; melted lower crustal (Moldanubian) rocks and primary c. 6 000 km2) is the largest Variscan magmatic complex magmas derived from an upper mantle source (Košler et in the Bohemian Massif. It has a horseshoe shape with al. 2001; Vrána and Janoušek 2006). western (Bavarian) and eastern (Moravo–Moldanubian) The tectonic activity along the faults of the Blanice branches joining in the Waldviertel area (Austria). The Graben can also be inferred from the presence of sev- eastern branch forms a NNE–SSW trending domal eral discontinuous occurrences (erosional relics) of structure formed by gravity-driven diapiric upwelling Permo–Carboniferous (Gzhelian to Cisuralian; c. 300– of the metapelitic middle crust (Žák et al. 2011; Verner 275 Ma) sedimentary successions (Holub 2001). It is et al. 2014). The Moldanubian Batholith consists of not clear whether these originally formed a continuous three to four principal intrusive groups (mostly S and sedimentary basin. If so, then it was about 12 km wide S/I types, rarely I-type; e.g. Holub et al. 1995; Klečka and at least 130 km long. The main and late stages and Matějka 1996; Matějka and Janoušek 1998; Gerdes of sedimentation were accompanied by movements et al. 2000, 2003; Gerdes 2001; Finger et al. 2009; along the eastern faults of the Blanice Graben. This is Breiter 2010), ranging in age from c. 330–323 Ma to indicated by: (i) the location of the axis of maximum c. 305–302 Ma (see, e.g., the review of Bankwitz et subsidence close to the eastern margin of the Blanice al. 2004). Graben, (ii) the presence of proluvial conglomerates The Blanice Graben (also called the Kouřim–Blanice– exclusively along the eastern marginal fault and (iii) the Kaplice–Rödl fault zone; Fig. 1a) extends from Český general dip of the strata to the E (10–40°). The maxi- Brod E of Prague to Linz in Austria. On a regional scale, mum thickness of the Permo–Carboniferous strata is it belongs to a set of conjugate sinistral (NE–SW; e.g. at least ~700–800 m in the northern (near Český Brod) Vitis, Rödl, Diendorf) and dextral (NW–SE; e.g. Pfahl, and central relics (near Tábor), but attains only ~380 m Danube) shear zones in the southern part of the Bohemian in the southern relic (near České Budějovice). The most Massif, which resulted from late Variscan N–S oriented intense subsidence in the Blanice Graben occurred at compression (Brandmayr et al. 1995). c. 280–270 Ma. The southernmost (Austrian) part of the Blanice The tectonic history of the Blanice Graben was also Graben (also referred to as the Rödl shear zone) is reflected in several episodes of hydrothermal activity: a sinistral ductile shear zone with NE–SW-trending, Au–Ag (oldest, c. 300 Ma), Ag–Pb–Zn (most widespread) steeply dipping foliation and subhorizontal stretching and U (youngest, c. 260 Ma, subeconomic). The geology, lineation. Synkinematic mylonitization was dated at mineralogy and tectonic evolution of the Au–Ag deposits around 288–281 Ma (Brandmayr et al. 1995; Ar–Ar were summarized by Zachariáš et al. (2004, 2009) and method); however, these ages most probably only rep- Zachariáš and Hübst (2012). The Ag–Pb–Zn, mostly resent cooling below the muscovite blocking tempera- vein-type deposits are characterized by quartz–carbonate ture. Paleostress analysis of brittle faults and fractures gangue, by abundance of galena accompanied by sphaler- from the same zone documented their formation in the ite and Ag-phases (miargyrite, pyrargyrite, argentite and strike-slip regime under NW–SE and NE–SW oriented native silver) and by the scarcity of Fe-sulfides (pyrite, subhorizontal maximum principal stress direction (σ1) arsenopyrite and pyrrhotite). The most important mining and minimum principal stress direction
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