International Journal of Earth Sciences

, Volume 103, Issue 2, pp 455–483 | Cite as

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

  • Vojtěch Janoušek
  • Jaroslav Aichler
  • Pavel Hanžl
  • Axel Gerdes
  • Vojtěch Erban
  • Vladimír Žáček
  • Vratislav Pecina
  • Marta Pudilová
  • Kristýna Hrdličková
  • Petr Mixa
  • Eliška Žáčková
Original Paper


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.


Bohemian Massif Devonian volcanic rocks Geochemistry U–Pb zircon dating Sr–Nd–O isotopes Variscan orogeny 



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.

Supplementary material

531_2013_975_MOESM1_ESM.xls (50 kb)
Supplementary material 1 (XLS 50.5 kb) List of samples of metavolcanites from the southern part of the Vrbno Group
531_2013_975_MOESM2_ESM.doc (41 kb)
Supplementary material 2 (DOC 41 kb) Petrography and mineral chemistry
531_2013_975_MOESM3_ESM.xls (57 kb)
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 (86 kb)
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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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Vojtěch Janoušek
    • 1
  • Jaroslav Aichler
    • 1
  • Pavel Hanžl
    • 1
  • Axel Gerdes
    • 2
    • 3
  • Vojtěch Erban
    • 1
  • Vladimír Žáček
    • 1
  • Vratislav Pecina
    • 1
  • Marta Pudilová
    • 4
  • Kristýna Hrdličková
    • 1
  • Petr Mixa
    • 1
  • Eliška Žáčková
    • 1
  1. 1.Czech Geological SurveyPrague 1Czech Republic
  2. 2.GeowissenschaftenGoethe Universität FrankfurtFrankfurt am MainGermany
  3. 3.Department of Earth SciencesStellenbosch UniversityMatielandSouth Africa
  4. 4.Charles UniversityPrague 2Czech Republic

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