Record details

Title
    Heat sources and trigger mechanisms of exhumation of HP granulites in Variscan orogenic root
Author
    Guy, Alexandra
    Janoušek, Vojtěch
    Lexa, Ondrej
    Racek, Martin
    Schulmann, Karel
    Štípská, Pavla
Language
    anglicky
Publication type
    článek v periodiku
Source title - serial
    Journal of Metamorphic Geology
Vol./nr.
    Roč. 29, č. 1
Pages
    23
Year
    2011
Thesaurus term
    crustal structure, exhumation of lower crust, heat sources, radioactive heating
Keyword
    Exhumation
    Granulites
    Heat
    HP
    Mechanisms
    Orogenic
    Root
    Sources
    Trigger
    Variscan
Abstract (in english)
   The structure of the Moldanubian domain is marked by felsic granulites of Ordovician protolith age forming the cores of domes that are separated from mid-crustal Neoproterozoic and Palaeozoic metasedimentary rocks that occur in synclines by a late Ordovician to Silurian metabasic unit. Reflection and refraction seismic sections combined with gravity inversion modelling suggest the presence of a low density layer at the bottom of the crust (interpreted as felsic granulite) overlain by a denser layer (interpreted as amphibolite) with layers of intermediate density at the top (interpreted as metasedimentary rocks). It is proposed that the granulite domes surrounded by middle crustal rocks reflect transposed horizontal layering originally similar to that preserved in the deep crust and imaged by the geophysical surveys.
Contributor
    Česká geologická služba
Contributor code
    ČGS (RIV)
Source format
    R
Import date
    15. 10. 2014