Record details

Title
    Early Palaeozoic rift-related magmatism in Variscan Europe: fragmentation of the Armorican Terrane Assemblage
Statement of responsibility
    Q.G. Crowley, P.A. Floyd, J.A. Winchester, Wolfgang Franke, J.G. Holland
Author
    Crowley, Q. G.
    Floyd, P. A.
    Franke, Wolfgang
    Holland, J. G.
    Winchester, J. A.
Language
    anglicky
Source title - serial
    Terra nova
Vol./nr.
    Vol. 12, no. 4
Pages
    p. 171-180
Year
    2000
Notes
    9 obr., 1 tab.
    il.
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Terra nova
Subject group
    chemismus hornin
    Gondwana
    granitoidy
    kůra oceánská
    magma bimodální
    metabazalt
    ofiolity
    ortorula
    paleogeografie
    paleozoikum-spodní
    petrogeneze
    složení tholeiitické
    terán
    vrásnění variské
    západosudetská oblast
    zóna riftová
Geographical name
    ČR-Čechy
    Evropa západní
    Jizerské hory
    Mariánské Lázně (Cheb)
    Orlické hory
    Polsko - jihozápad
    Železný Brod (Jablonec nad Nisou)
Keyword
    Armorican
    Assemblage
    Early
    Europe
    Fragmentation
    Magmatism
    Palaeozoic
    Rift-related
    Terrane
    Variscan
Abstract (in english)
   Early Palaeozoic bimodal rift-related magmatism is widespread throughout much of the Variscides of Europe. It is traceable from the Polish Sudetes to NW Iberia. Granitic plutonism generally predates Cambro-Ordovician bimodal magmatism. In the N Bohemian Massif this early Palaeozoic granitic plutonism was generated by partial melting of Cadomian basement, whereas contemporaneous alkali granites with a mantle component are typical of the NW Iberian Massif, Massif Central and NW Iberian Massif, Massif Central and NW Iberian Massif is partly preserved as obducted ophiolites. Compositional diversity displayed by Cambro-Ordovician mafic magmatism can be accounted for by interaction between a spreading centre and an upwelling mantle plume. This indicates that combined tensional forces and mantle plume convection assisted the early Palaeozoic dispersal of terranes from the N Gondwana margin.
   Continued fragmentation resulted in development of an archipelago of related terranes separated by a network of seaways and formation of oceanic crust
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    31. 8. 2007
Import date
    8. 8. 2012