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Results of Repeated Measurements at the Železné Hory-Tišnov Fault System Surroundings

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Results of Repeated Measurements at the Železné Hory-Tišnov Fault System Surroundings Acta Geodyn. Geomater., Vol. 11, No. 3 (175), 211–223, 2014 DOI: 10.13168/AGG.2014.0009 journal homepage: http://www.irsm.cas.cz/acta ORIGINAL PAPER RESULTS OF REPEATED MEASUREMENTS AT THE ŽELEZNÉ HORY-TIŠNOV FAULT SYSTEM SURROUNDINGS 1) 1) 1 Otakar ŠVÁBENSKÝ *, Lubomil POSPÍŠIL , Josef WEIGEL ) , Pavel ROŠTÍNSKÝ 2) and Michal WITISKA 3) 1) Institute of Geodesy, Faculty of Civil Engineering, Brno University of Technology, Veveří 94, 602 00 Brno, Czech Republic 2) Institute of Geonics, Academy of Sciences of the Czech Republic, Dept. of Environmental Geography, Drobného 28, 602 00 Brno, Czech Republic 3) Svatopluka Čecha 9, 586 01 Jihlava *Corresponding author‘s e-mail: [email protected] ARTICLE INFO ABSTRACT Article history: Received 10 February 2014 The article deals with the possibility of usage of the comprehensive geodetic, geological, and Accepted 30 May 2014 geophysical knowledge for mapping of the critical areas surrounding of the Železné hory – Available online 16 June 2014 Tišnov tectonic zone (ZHTTZ) that might from recent point of view (geodynamical and partly seismotectonic) represent next major kinematical boundaries for the area of the Moravia. On the Keywords: Moravia territory we shortly demonstrate results of the GPS and quantitative geophysical Moravia analyses, that enable to evaluate preliminary movement tendencies in the area. The information Železné hory - Tišnov tectonic zone can be in future period used for prognostication of localities with possible higher seismic GPS hazards. Movement tendencies 1. INTRODUCTION sediments (Upper Cenomanian, around 95 Ma old) of The Morava network was founded in 1994 as the Nysa-Kłodzka Trough by a fault structure which locally has the character of a reverse fault. At the end one of the first GPS geodynamic projects in Czech Republic with aim to determine the deformations at we have to mention the environs of Lądek-Zdrój and border zone between the Bohemian Massif and the Bruntál, where basaltic lavas poured out on the Carpathians. Three GPS campaigns were carried out gravels deposited at the Tertiary-Quaternary boundary in period 1994 – 1996, but the measurements were not (Birkenmayer et al., 2002). continued. Central part of the Bohemia dominates the Železné hory – Tišnov tectonic zone (ZHTTZ – Mísař In 2010 the Institute of Geodesy of BUT Brno seized the opportunity to carry out new measurements et al., 1983). This fault limits the Železné hory from in southern part of the Morava network including five the south. With this tectonic system the next stations, and in 2013 another seven points have been significant dislocations are combined. In the Kutná re-measured in central and northern parts. The paper Hora crystalline complex it is the Hlinsko tectonic presents a comparison of results of previous and zone which separates the above mentioned crystalline from Svratka crystalline complex. Next two zones, the contemporary (after time lag of more than 15 years) epoch GPS measurements. Last results confirm the Křídlo and the Vír faults, are located in Svratka movement tendencies at the Bohemian Massif and the crystalline. Apart from this dislocations in this area Western Carpathians border, indicating recent tectonic there exist group of partial faults and mylonite zone activity at different parts of the Moravia territory (usually with clay filling), that considerably weakened (Fig . 1). rock massifs. The weakened zone are also bound on the mica schist. The Železné hory fault itself imagines 2. TECTONIC PATTERN dislocation tilted to NE, along it the movements were Description of the Tertiary to recent tectonic repeated also in post-Variscan epochs (so called p attern in the Moravia territory is presented from the Saxonian tectonics). N to S (Fig. 1). East of the Velké Vrbno Dome, At the south, in the NNW-SSE direction, the important Ramzová tectonic line is situated with a significant Cretaceous depression follows the the Branná Group of probably Devonian age (Middle ZHTTZ. Thickness of Cretaceous sediments reaches Paleozoic, around 380 million years) behind it, which up to 90 m. In contact places with ZHTTZ this covers only a small, south-eastern section in the map. depression changes its direction to NW-SE, narrows The crystalline series of the Sniežnik metamorphic and partly plays out. unit in the west are separated from the Cretaceous 212 O. Švábenský et al. The tectonic connection between the Boskovice This tectonic “double” of faults strongly furrow and the Diendorf fault system is the key for influenced segmentation of area during the Oligocene- understanding of Tertiary to recent tectonic processes Early Neogene period (Roštínský, 2003), while the in area between the Moldanubian, the Saxothuringian actual altitudinal contrast between the higher elevated and the Brunnovistulian units. With this zone next crystalline terrain of the Massif and the lower problems are combined, e.g existence of Moravicum. sedimentary relief of the Foredeep is likely of the Late Under this naming Jiříček (1991) describes the most Miocene-Quaternary age (Roštínský, 2003). problematic unit, placed between the Dyje and the Concerning the recent geodynamical activity, Brno Massif. This interpretation, that is not at all unclear situation is in the Moldanubian unit, where the generally accepted, has many indices in geophysical earthquake foci were also registered along the main data. From the first one it is separated by the Diendorf faults. fault, by the Miroslav fault, from the second one it is During Alpine orogeny, the Bohemian Massif continuation of the Diendorf-Čebín Tectonic Zone comprised a northern tectonic foreland of the Alps and (DCTZ) through Central basic belt. the Carpathians. An Alpine stress field must have At first place, the Hollabrunn, Krhovice and been established which was probably very similar to Miroslav crystalline complexes represent it there. In that maintained in the Hercynian orogeny. As a result, its deep basement the Brunnia unit (Mísař et al., 1983) Variscan shear zones likely were locally reactivated at is evolved, its granitoides rise to the surface under higher crustal levels. The graben of České Budějovice Wienerwald flysch in the Tulln Dome and in the Dyje (Fig. 1) contains Cretaceous to Miocene sedimentary Dome (second one Jiříček (1991) does not rocks and is bordered by faults which have NW-SE consider!?). Its cover was detected in the northern part and NE-SW to NNE-SSW orientations; therefore, of the Miroslav horst, too Roštínský (2003). The Alpine faulting is suggested for this graben (Fuchs Moldanubian to the south from the Dyje Dome, lines and Matura, 1976). Reactivation of the shear zones wide zone, elongated in the N-S direction in more supports interpretation of a pattern of shear than 100 km. In the common view the Hollabrunn unit deformation extending into Middle Europe and represents deep crystalline synclinorium between Dyje explained by Alpine N-S striking convergence and Brno granitoids belonging to the Bruno- (Stackebrandt and Franzke, 1989). vistulicum. The Diendorf fault runs in the geological map from Melk to the NE to Langelois town, dividing 3. GEOPHYSICAL DATA AND REMOTE SENSING the Krhovice foreland. Continuation of the fault to the DATA west of the Miroslav crystalline complex is still open Although the analysis of Remote Sensing data has not been the subject of a project, analysis of to argumentation. We can also observe its connection to the eastern fault of the Boskovice furrow. Because selected parts of the Bohemian Massif showed that the the Permo-Carboniferous sediments of Boskovice majority of fractures, which focus on GPS campaigns furrow are the lower situated block against the Brno (Sudetic Marginal fault, Diendorf-Čebín tectonic Massif, many authors connect the Diendorf fault with zone, Waitzendorf fault, Bulhary fault etc.), have the subsidence and strike-slip tectonics (Fig. 1). a number of morphological characters and elements that are pointing to recent dynamics of these Analogical situation is placed in the eastern direction with the Miroslav fault; on its depressed interfaces. western block are Permo-Carboniferous and Therefore, for purposes of analysis and crystalline complex, and granitoids on the higher Brno interpretation of physical tendencies a set of block. After Jiříček (1991), this fact gives to the geophysical maps were compiled. These maps were Miroslav crystalline complex rather depressed also used to verify the interpretation of results. In addition, this interface was often traceable on aerial or structure than the horst character as is generally accepted. Considering the fact, that on the depressed satellite images. Dyje block we can find granitoids, which occur on the From these data, we then proceeded to compile Miroslav or the Krhovice upper block under the a simplified map of faults with recent activity. We are metamorphites, there have been long discussed aware that in the future it will be necessary to unify question about the connection of the Diendorf fault the methodology of velocity estimation from different sources for detail research of the Bohemian Massif. with the horizontal displacements, steep overthrust of the Hollabrunn crystalline complex or the Dyje Massif in opposite direction of the fault. 4. GPS DATA Zone between Geras and Znojmo is influenced Regional velocity field resulting from complex by next important fault system – the Waitzendorf analysis based on reprocessed homogenized long-term fault. This fault is crossing the Dyje Dome, cuts GPS measurements provided by permanent and mainly complexes of Brunnia, only on the SW margin epoch-wise GPS stations located on the territory of of the Dome crosses the Moravian unit. In the zone Czech Republic, Slovakia and adjacent territories was b etween Diendorf and Waitzendorf faults there exist published in (Hefty, 2007) and (Hefty et al., 2010). many subsidiary parallel and oblique, N-S orientated The analyzed data stemmed from more than 110 GPS dislocations (Roštínský and Rötzel, 2005). RESULTS OF REPEATED MEASUREMENTS AT THE ŽELEZNÉ HORY-TIŠNOV … 213 . Fig. 2 Location of the Morava and CZEPOS network points.
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