Record details

Title
    Magmatic to solid state fabrics in syntectonic granitoids recording early Carboniferous orogenic collapse in the Bohemian Massif
Author
    Chlupácová, Marta
    Halodová, Patricie
    Holub, František
    Kabele, Petr
    Verner, Kryštof
    Žák, Jiří
Language
    anglicky
Publication type
    článek v periodiku
Source title - serial
    Journal of Structural Geology
Vol./nr.
    Roč. 36, č. 3
Pages
    16
Year
    2012
Thesaurus term
    Bohemian Massif
    Exhumation
    Granite
    Gravitational collapse
    Tepla-Barrandian unit
    Variscan orogeny
Keyword
    Bohemian
    Carboniferous
    Collapse
    Early
    Fabrics
    Granitoids
    Magmatic
    Massif
    Orogenic
    Recording
    Solid
    State
    Syntectonic
Abstract (in english)
   The similar to 354-336 Ma Central Bohemian Plutonic Complex is a Variscan magmatic arc that developed in the central Bohemian Massif in response to subduction of the Saxothuringian lithosphere beneath the Tepla-Barrandian microplate. Magmatic to solid state fabrics in the most voluminous portion of this arc (the similar to 346 Ma Blatna pluton) record two superposed orogenic events: dextral transpression associated with arc-parallel stretching and arc-perpendicular shortening, and normal shearing associated with exhumation of the high-grade core of the orogen (Moldanubian unit). This kinematic switch is an important landmark in the evolution of this segment of the Variscan belt for it marks the cessation of subduction-related compressive forces in the upper crust giving way to gravity-driven normal movements of the Tepla-Barrandian hanging wall block relative to the high-grade Moldanubian footwall. We use thermal modeling to demonstrate that the emplacement of huge volumes of arc magma
   s and their slow cooling produced a thermally softened domain in the upper crust and that the magmatic arc granitoids may have played a major role in initiating the orogenic collapse in the Bohemian Massif through lubrication and reactivation of a pre-existing lithospheric boundary and decreasing the overall strength of the rigid orogenic lid.
Contributor
    UK Praha, Přírodovědecká fakulta
Contributor code
    UK, PřF
Source format
    R
Import date
    27. 4. 2014