Environmental Earth Sciences

, Volume 69, Issue 5, pp 1601–1607 | Cite as

Increased soil gas radon and indoor radon concentrations in Neoproterozoic olistostromes of the Teplá-Barrandian unit (Czech Republic)

  • Ivan BarnetEmail author
  • Petra Pacherová
Original Article


The Neoproterozoic olistostromes were first distinguished as a special geological unit in a generalised geological map of the Czech Republic on a scale 1:500,000. The olistostromes represent a tectonic mélange or subaquatic continental slope-slides formed by a mixture of black shales, greywackes, carbonates and shales, forming an extremely inhomogeneous geological environment. The extreme over-limit values of indoor radon (Rn, 222Rn) were first detected during check measurements performed for final building approval by team of the National Radiation Protection Institute in a house situated on bedrock of black shales—lithological component of olistostromes north-eastward from Plzeň. Additional measurements of soil gas Rn performed by the Czech Geological Survey were oriented to cover the whole olistostrome belt extending over 65 × 25 km area NE of Plzeň–Prague general direction. The increased concentrations both of soil gas and indoor Rn were confirmed in the whole extent of Neoproterozoic olistostrome belt compared to neighbouring geological units (Neoproterozoic metasediments on NW and Cambrian Palaeovolcanites and Ordovician sediments on SE). This observation lead to increasing the radon index of olistostromes to medium radon category (from the low one) both in general and detailed Rn index maps. Drawing the attention to this lithological type enables to improve the radon risk prevention for newly built houses and interest of remediation of existing houses not only in the specific area of the Czech Republic, but also in other European countries, where Neoproterozoic olistostromes form the geological basement.


Neoproterozoic olistostromes Soil gas radon Indoor radon Extreme concentrations Teplá-Barrandian unit Bohemicum 



Department of Geology, Ministry of Environment, is thanked for funding the project 630100, oriented to actualization of radon index maps. This project followed the Action plan of the Radon Programme of the Czech Republic. The authors are grateful to colleagues from the NRPI for sharing and interpretation of indoor data from the studied area.


  1. Banerjee DM, Schidlowski M, Siebert F, Brasier MD (1997) Geochemical changes across the Proterozoic–Cambrian transition in the Durmala phosphorite mine section, Mussoorie Hills, Garhwal Himalaya, India. Palaeogeogr Palaeocl 132:183–194CrossRefGoogle Scholar
  2. Barnet I, Pacherová P, Neznal M, Neznal M (2008) Radon in geological environment—Czech experience. Czech Geol Survey Special Papers 19, Czech Geological Survey, Prague, p 70Google Scholar
  3. Cháb J, Stráník Z, Eliáš M (2007) Geological map of the Czech Republic 1:500,000. Czech Geological Survey, PragueGoogle Scholar
  4. Choubey VM, Bartarya SK, Ramola RC (2005) Radon variations in an active landslide zone along the Pindar River, in Chamoli District, Garhwal Lesser Himalaya, India. Environ Geol 47:745–750CrossRefGoogle Scholar
  5. Clavensjö B, Åkerblom G. (1994) the radon book—measures against radon. Swedish Council for Building ResearchGoogle Scholar
  6. Dörr W, Zulauf W, Fiala J, Franke W, Vejnar Z (2002) Neoproterozoic to Early Cambrian history of an active plate margin in the Teplá–Barrandian unit–a correlation of U-Pb isotopic dilution–TIMS ages (Bohemia, Czech Republic). Tectonophysics 352:65–85CrossRefGoogle Scholar
  7. Drost K, Linnemann U, McNaughton N, Fatka O, Kraft P, Gehmlich M, Tonk Ch, Marek J (2004) New data on the Neoproterozoic—Cambrian geotectonic setting of the Teplá-Barrandian volcano-sedimentary successions: geochemistry, U-Pb zircon ages, and provenance (Bohemian Massif, Czech Republic). Int J Earth Sci (Geol Rundsch) 93:742–757CrossRefGoogle Scholar
  8. Ennemoser O, Giacomuzzi SMG, Brunner P, Schneider P, Stingl V, Purtcheller F, Ambach W (1995) Radon measurements in soil to predict indoor radon concentrations in new buildings in an area with unusually high radon levels. Sci Total Environ 162:209–213CrossRefGoogle Scholar
  9. Eyles N, Januszczak N (2004) ‘Zipper-rift’: a tectonic model for Neoproterozoic glaciations during the breakup of Rodinia after 750 Ma. Earth-Sci Rev 65:1–73CrossRefGoogle Scholar
  10. Froňka A, Jílek K, Moučka L, Brabec M (2011) Significance of independent radon entry rate and air exchange assessment for the purpose of radon mitigation effectiveness proper evaluation: case studies. Radiat Prot Dosim 1–5. doi: 10.1093/rpd/ncr051
  11. GD (2009) Governmental decree 594/2009—Action plan of radon programme of the Czech Republic 2010–2019Google Scholar
  12. Hajná J, Žák J, Kachlík V, Chadima M (2010) Subduction-driven shortening and differential exhumation in a Cadomian accretionary wedge: the Teplá-Barrandian unit, Bohemian Massif. Precambrian Res 176:27–45CrossRefGoogle Scholar
  13. Hajná J, Žák J, Kachlík V (2011) Structure and stratigraphy of the Teplá–Barrandian Neoproterozoic, Bohemian Massif: a new plate-tectonic reinterpretation. Gondwana Res 19:495–508CrossRefGoogle Scholar
  14. Kříbek B, Pouba Z, Skoček V, Waldhauserová J (2000) Neoproterozoic of the Teplá-Barrandian Unit as a part of the Cadomian orogenic belt: a review and correlation aspects. Bull Czech Geol Surv 75(3):175–196Google Scholar
  15. Matolín M, Koudelová P (2008) Radon in soil gas—investigation and data standardisation at radon reference sites, Czech Republic. Radiat Prot Dosim 130(1):52–55CrossRefGoogle Scholar
  16. Neznal M, Neznal M, Matolín M, Barnet I, Mikšová J (2004) The new method for assessing the radon risk of building sites. Czech Geological Survey Special Papers 1, CGS Prague, p 47Google Scholar
  17. Och ML (2011) Biogeochemical cycling through the Neoproterozoic-Cambrian transition in China: an integrated study of redox-sensitive elements. Ph.D. Thesis 266p University College London (UCL)Google Scholar
  18. Pahapill L, Åkerblom G (1999) Radon control in Estonia. Conference radon in the living environment, abstract 066, Athens, pp 597–606Google Scholar
  19. Pašava J (2000) Normal versus metal-rich black shales in the Barrandian Neoproterozoic of the Teplá-Barrandian unit: a summary with new data. Bull Czech Geol Surv 75(3):229–239Google Scholar
  20. Petersell V, Åkerblom G, Ek BM, Engel M, Möttus V, Täht K (2005) Radon risk map of Estonia. Geological Surveys of Estonia and Sweden, Swedish Radiation Protection Authority. StockholmGoogle Scholar
  21. Purtscheller F, Pirchl T, Sieder G, Stingl V, Tessadri T, Brunner P, Ennemoser O, Schneider P (1995) Radon emanation from giant lanslides of Koefels (tyrol, Austria) and Langtang Himal (Nepal). Environ Geol 26:32–38CrossRefGoogle Scholar
  22. Rawat TPS, Joshi GB, Basu B, Absar N (2010) Occurence of proterozoic black shale-hosted uranium mineralisation in Tal Group, Sirmour District, Himachal Pradesh. J Geol Soc India 75:709–714CrossRefGoogle Scholar
  23. Röhlich P (1963) Submarine Slides and Mudflows in the Youngest Algonkian of Central Bohemia. (in Czech, Engl. Summary) J Geol Sci G (6):89–121Google Scholar
  24. Röhlich P (2000) Some stratigraphic problems of the Barrandian Neoproterozoic. Bull Czech Geol Surv 75(3):201–204Google Scholar
  25. Schröder S, Grotzinger PJ (2007) Evidence for anoxia at the Ediacaran–Cambrian boundary: the record of redox-sensitive trace elements and rare earth elements in Oman. J Geol Soc Lond 164:175–187CrossRefGoogle Scholar
  26. Singh SK, Dalai TK, Krishnaswami S (2003) 238U series isotopes and 232Th in carbonates and black shales from the Lesser Himalaya: implications to dissolved uranium abundances in Ganga-Indus source waters. J Environ Radioactiv 67:69–90CrossRefGoogle Scholar
  27. Sláma J, Dunkley DJ, Kachlík V, Kusiak MA (2008) Transition from island-arc to passive setting on the continental margin of Gondwana: U-Pb zircon dating of Neoproterozoic metaconglomerates from the SE margin of the Teplá–Barrandian Unit. Bohemian Massif Tectonophysics 461:44–59CrossRefGoogle Scholar
  28. Sundal AV, Henriksen H, Soldal O, Strand T (2004) The influence of geological factors on indoor radon concentrations in Norway. Sci Total Environ 328:41–53CrossRefGoogle Scholar
  29. Thinová L, Froňka A, Rovenská K (2011) A pilot study of the dependence of radon concentration on the tectonic structures, using simple geophysical methods. Radiat Prot Dosim 145(2–3):159–165CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.Czech Geological Survey Klarov 3Prague 1Czech Republic

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