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Constraining genesis and geotectonic setting of metavolcanic complexes: a multidisciplinary study of the Devonian Vrbno Group (Hrubý Jeseník Mts., Czech Republic)

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Abstract

The low-grade metavolcanic/volcanosedimentary complex of the Devonian Vrbno Group (Silesicum, NE Bohemian Massif, Czech Republic) occurs in two ~NE–SW trending belts, separated by tectonic slices of Cadomian metagranitic paraautochton. (1) The basic–intermediate lavas of the calc-alkaline Western Volcanic Belt came from a moderately depleted mantle \( \left( {\varepsilon_{\text{Nd}}^{370} \sim + 3} \right) \). Rare rhyolites (374.0 ± 1.7 Ma: 2σ, LA–ICP–MS U–Pb Zrn) were derived most likely from immature crust or by extensive fractionation of primary basaltic melts. The rock association is interpreted as a vestige of a deeply dissected continental arc. (2) The Eastern Volcanic Belt consists mainly of (nearly) contemporaneous (371.0 ± 1.4 Ma) felsic alkaline lavas with high HFSE contents, as well as high Ga/Al and Fe/Mg ratios, typical of within-plate igneous setting. The petrology and Nd–Sr isotopic data point to a high-T anatexis of a young metagranitic crust, resembling the Cadomian (Brunovistulian) basement, in a back-arc setting. The attenuated Brunovistulian lithosphere could have partially melted by the heat provided by the upwelling asthenosphere and/or underplating basic magma. (3) Finally, the region was penetrated by numerous subalkaline, MORB/EMORB-like dolerite sheets—a hallmark of the considerable crustal thinning.

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Acknowledgements

The manuscript benefited from reviews by M. Poujol and F. Finger, as well as from editorial handling of I. Braun. We are thankful to K. Schulmann (Czech Geological Survey, Prague) for enlightening discussions on structure and development of the Variscan Orogen, A. Přichystal (Masaryk University, Brno) for field assistance and advice, M. Chlupáčová (AGICO Inc., Brno) for comments on earlier version of the manuscript, and explaining the role of radioactive elements in particular, as well as D. Wilimský (former student at Masaryk University, Brno) for help in sample collection and zircon separation. We are also indebted to K. Žák, who has acquired the O isotopic analyses in the laboratories of the Czech Geological Survey. This work was financed by the Grant Agency of the Czech Republic (GAČR) Project 205/01/0331 (to J. Aichler) and Ministry of Education, Youth and Sports (MŠMT) project LK 11202 (ROPAKO, to K. Schulmann), which are gratefully acknowledged.

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Authors and Affiliations

  1. Czech Geological Survey, Klárov 3, 118 21, Prague 1, Czech Republic

    Vojtěch Janoušek, Jaroslav Aichler, Pavel Hanžl, Vojtěch Erban, Vladimír Žáček, Vratislav Pecina, Kristýna Hrdličková, Petr Mixa & Eliška Žáčková

  2. Geowissenschaften, Goethe Universität Frankfurt, Altenhöferallee 1, 60438, Frankfurt am Main, Germany

    Axel Gerdes

  3. Department of Earth Sciences, Stellenbosch University, Private Bag X1, Matieland, 7602, South Africa

    Axel Gerdes

  4. Charles University, Albertov 6, 128 43, Prague 2, Czech Republic

    Marta Pudilová

Authors
  1. Vojtěch Janoušek
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  2. Jaroslav Aichler
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  3. Pavel Hanžl
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  5. Vojtěch Erban
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  6. Vladimír Žáček
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  7. Vratislav Pecina
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  8. Marta Pudilová
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  9. Kristýna Hrdličková
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  10. Petr Mixa
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  11. Eliška Žáčková
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Correspondence to Vojtěch Janoušek.

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This paper is dedicated to the memory of J. Aichler, an honest man, a good geologist and a tireless organizer.

J. Aichler: Deceased.

Electronic supplementary material

Below is the link to the electronic supplementary material.

Supplementary material 1 (XLS 50.5 kb) List of samples of metavolcanites from the southern part of the Vrbno Group

Supplementary material 2 (DOC 41 kb) Petrography and mineral chemistry

Supplementary material 3 (XLS 57 kb) U–Pb LA-ICP-MS data for dated acid metavolcanic rocks of the Vrbno Group

531_2013_975_MOESM4_ESM.xls

Supplementary material 4 (XLS 85.5 kb) Complete whole-rock major- and trace-element analyses for Devonian metavolcanic rocks, Hrubý Jeseník Mts. (wt. % and ppm, respectively)

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Janoušek, V., Aichler, J., Hanžl, P. et al. Constraining genesis and geotectonic setting of metavolcanic complexes: a multidisciplinary study of the Devonian Vrbno Group (Hrubý Jeseník Mts., Czech Republic). Int J Earth Sci (Geol Rundsch) 103, 455–483 (2014). https://doi.org/10.1007/s00531-013-0975-4

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