Record details

    40Ar/39Ar isotopic evidence for mid-Devonian post-metamorphic pegmatite emplacement in the Mariánské Lázně Complex, Bohemian Massif, Central European Hercynides
Statement of responsibility
    Donald R. Bowes, Van Breemen, A.M. Hopgood, Emil Jelínek
    Bowes, Donald R.
    Hopgood, A. M.
    Jelínek, Emil, 1943-
    Van Breemen, O.
Source title - serial
    Neues Jahrbuch für Mineralogie. Monatshefte
    H. 10
    s. 445-457
    2 obr., 1 tab., 3 s.bibl.
    Zkr. název ser.: Neu. Jb. Mineral., Mh.
Subject group
    datování Ar/Ar
    mariánskolázeňský bazický komplex
    vrásnění variské
Geographical name
    Tisová (Karlovy Vary)
Abstract (in english)
   Large (2-3 cm) crystals of ferroan pargasite in a narrow pegmatite vein that cross-cuts amphibolite in the Mariánské Lázně Complex yield 40Ar/39Ar regression ages of 378.7+-3.5 and 379.5+-4.3 Ma: these date the time of cooling through 550-500 °C soon after emplacement and crystallization. With this and associated veins also cutting flexural-type folds and a fracture cleavage, both tectonothermal activity in, and uplift of the host metamorphic assemblage into the upper crust must have taken place by, or near, a time corresponding to the Eifelian-Givetian boundary (mid-Devonian). The age of pegmatite formation corresponds, within errors, with the time of closure of the Sm-Nd isotopic system in eclogites elsewhere in the domain (377+-7 Ma). This points to the crustal uplift having been rapis.
   Isotopic evidence also indicates a considerable time gap between the tectonothermal - igneous activity so prominently expressed in the Mariánské Lázně Complex and the superimposed effects of early Carboniferous tectonothermal activity
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    12. 9. 2007
Import date
    8. 8. 2012