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Geoelectrical and geological structure of the crust in Western Slovakia |
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| Authors: | Vladimír Bezák Josef Pek Ján Vozár Miroslav Bielik Jozef Vozár |
| Institution: | 1. Geophysical Institute, Slovak Academy of Sciences, Dúbravská 9, 848 25, Bratislava, Slovak Republic 2. Institute of Geophysics, Academy of Sciences of the Czech Republic, Bo?ní II/1401, 141 31, Praha 4, Czech Republic 3. Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, Ireland 4. Department of Applied and Environmental Geophysics, Faculty of Natural Sciences, Comenius University, Mlynská dolina, 842 48, Bratislava, Slovak Republic 5. Geological Institute, Slovak Academy of Sciences, Dúbravská 9, P.O.BOX 106, 840 05, Bratislava, Slovak Republic |
| Abstract: | Electrical resistivity of the Earth’s crust is sensitive to a wide range of petrological and physical parameters, and it particularly clearly indicates crustal zones that have been tectonically or thermodynamically disturbed. A complex geological structure of the Alpine nappe system, remnants of older Hercynian units and Neogene block tectonics in Western Slovakia has been a target of recent magnetotelluric investigations which made a new and more precise identification of the crustal structural elements of the Western Carpathians possible. A NW-SE magnetotelluric profile, 150 km long, with 30 broad-band and 3 long-period magnetotelluric sites, was deployed, crossing the major regional tectonic elements listed from the north: Brunia (as a part of the European platform), Outer Carpathian Flysch, Klippen Belt, blocks of Penninic or Oravicum crust, Tatricum and Veporicum. Magnetotelluric models were combined with previous seismic and gravimetric results and jointly interpreted in the final integrated geological model. The magnetotelluric models of geoelectrical structures exhibit strong correlation with the geological structures of the crust in this part of the Western Carpathians. The significant resemblance in geoelectrical and crustal geological structures are highlighted in shallow resistive structures of the covering formations represented by mainly Tertiary sediments and volcanics. Also in the deeper parts of the crust highly resistive and conductive structures are shown, which reflect the original building Hercynian crust, with superposition of granitoids or granitised complexes and lower metamorphosed complexes. Another important typical feature in the construction of the Western Carpathians is the existence of young Neogene steep fault zones exhibited by conductive zones within the whole crust. The most significant fault zones separate individual blocks of the Western Carpathians and the Western Carpathians itself from the European Platform. |
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