Record details

Title
    Retrograde-metamorphic and hydrothermal alterations at the Rožná uranium deposit (Moldanubian Zone, Czech Republic)
Statement of responsibility
    Bohdan Kříbek, Petr Sulovský, Marta Pudilová, Antonín Hájek, Daniel Holeczy
Author
    Hájek, Antonín, 1944-
    Holeczy, Daniel
    Kříbek, Bohdan, 1946-
    Pudilová, Marta
    Sulovský, Petr, 1952-
Language
    anglicky
Source title - monograph
    Uranium deposits : from their genesis to their environmental aspects : proceedings of the International Workshop Organized by the Czech Group of the IAGOD, September 10-11, 2002
Pages
    s. 65-68
Notes
    3 obr.
    il.
    Obsahuje bibliografické odkazy
Classfication no.
    552
    553.3/.4
Conspectus category
    552
    553
Subject group
    chlority
    datování K/Ar
    hydrotermální alterace
    illit
    ložisko hydrotermální
    metamorfóza retrográdní
    moldanubikum strážecké
    muskovit
    rudy U
Geographical name
    ČR-Morava
    Rožná (Žďár nad Sázavou, Bystřice nad Pernštejnem)
Keyword
    Alterations
    Czech
    Deposit
    Hydrothermal
    Moldanubian
    Republic
    Retrograde-metamorphic
    Rožná
    Uranium
    Zone
Abstract (in english)
   The Rožná uranium is hosted by mylonites and cataclastites that formed during the Westphalian and Early Stephanian ductile to brittle shearing of the overthickened Variscan crust. The shearing was associated with the formation of white mica and widespread chloritization and sulphidation of the high-grade metamorphosed country rock. During the Late Stephanian and Lower Permian, chloritized zones were infiltrated by salinite, oxidized basinal brines capable to dissolve uranium from the host rock complex. The brines were gradually reduced by Fe2+ silicates (chlorite, biotite) and pyrite, giving rise to syn-ore alterations consisting mostly of Fe-illite and and hydrooxides of iron. During the Triassic and Jurassic periods, the Alpine tectonic and thermal reactivation resulted in the formation of post-ore sulphide-barite-fluorite mineralization, argillitization and silicification of host rocks and in local remobilization of uranium
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    21. 3. 2008
Import date
    8. 8. 2012