Podrobnosti záznamu

Název
    Structural position of high-pressure felsic to intermediate granulites from NE Moldanubian zone (Bohemian Massif)
Autor
    Kloetzli, Urs
    Konopásek, Jiří
    Košler, Jan
    Soejono, Igor
    Tajčmanová, Lucie
Jazyk
    anglicky
Typ dokumentu
    článek v periodiku
Zdrojový dokument - seriál
    Journal of the Geological Society London
Svazek/č.
    Roč. 167, č. 2
Strany
    17
Rok
    2010
Výraz tezauru
    granulites, geochronology, Moldanubian domain, thermodynamic modeling, xenotime, zircon
Klíčové slovo
    Bohemian
    Felsic
    Granulites
    High-pressure
    Intermediate
    Massif
    Moldanubian
    NE
    Position
    Structural
    Zone
Abstrakt (anglicky)
   A polyphase tectonic evolution in the area resulted in three deformation phases (D1-D3). Peak metamorphic conditions (860-1000°C and 16 kbar) in granulites are interpreted as reflecting an early stage of the high-grade evolution of the orogenic lower crust. These conditions were followed by exhumation of the orogenic lower crustal block into the middle crustal levels (6-8 kbar). Contrary to this, the study of metamorphic conditions in the surrounding mica-schists (660°C and 8 kbar) shows that these rocks never experienced pressures and temperatures of the orogenic lower crust. Laser ablation ICP-MS U-Pb dating of zircon from the granulite yielded a concordia age of 354 ? 7 Ma, while the conventional ID TIMS and laser ablation ICP-MS dating of xenotime gave identical concordia ages of 336.2 ? 1.2 and 339 ? 3 Ma, respectively.
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (RIV)
Zdrojový formát
    R
Datum importu
    15. 10. 2014