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International Journal of Earth Sciences

, Volume 107, Issue 2, pp 711–727 | Cite as

The radioisotopically constrained Viséan onset of turbidites in the Moravian-Silesian part of the Rhenohercynian foreland basin (Central European Variscides)

  • Jakub Jirásek
  • Jiří Otava
  • Dalibor Matýsek
  • Martin Sivek
  • Mark D. Schmitz
Original Paper

Abstract

The Březina Formation represents the initiation of siliciclastic flysch turbidite sedimentation at the eastern margin of Bohemian Massif or within the Rhenohercynian foreland basin. Its deposition started after drowning of the Devonian carbonate platform during Viséan (Mississippian) times, resulting in a significant interval of black siliceous shale and variegated fossiliferous shale deposition in a starved basin. Near the top of the Březina Formation an acidic volcanoclastic layer (tuff) of rhyolitic composition has been dated with high precision U–Pb zircon chemical abrasion isotope dilution method at 337.73 ± 0.16 Ma. This new radiometric age correlates with the previously inferred stratigraphic age of the locality and the current calibration of the Early Carboniferous geologic time scale. Shales of the Březina Formation pass gradually upwards into the siliciclastics of the Rozstání Formation of the Drahany culm facies. Thus our new age offers one of the few available radioisotopic constraints on the time of onset of siliciclastic flysch turbidites in the Rhenohercynian foreland basin of the European Variscides.

Keywords

Březina Formation Moravian Karst Viséan Mississippian Carboniferous Variscan orogeny Chronostratigraphy 

Notes

Acknowledgements

This study was made possible thanks to financial support within the grant project SGS SP2017/22 financed by the Ministry of Education, Youth and Sports. Some of the analytical work was performed using equipment that was financed by the project “Institute of Clean Technologies for Mining and Utilisation of Raw Materials for Energy”, reg. no. LO1406 and supported by the “Research and Development for Innovations Operational Programme”, which is financed by structural funds of the European Union and the state budget of the Czech Republic. The author also wants to acknowledge support from project Basic geological mapping of the Czech Republic, Brno area (No. 390003), supported by the Czech Geological Survey. Funding for the analytical infrastructure of the Boise State Isotope Geology Laboratory was provided by the US National Science Foundation (NSF) Major Research Instrumentation grants EAR-0521221 and EAR-1337887, and NSF Earth Sciences Division (EAR) Instrumentation and Facilities Program grant EAR-0824974. The authors are grateful to V. Kachlík and F. Finger, whose comments and suggestions helped to improve the scientific content of the paper.

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Authors and Affiliations

  1. 1.Faculty of Mining and GeologyVŠB- Technical University of OstravaOstravaCzech Republic
  2. 2.Czech Geological Survey, Branch BrnoBrnoCzech Republic
  3. 3.Department of GeosciencesBoise State UniversityBoiseUSA

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