Podrobnosti záznamu

    Garnet-bearing ultramafic rocks from the Erzgebirge, and their relation to other settings in the Bohemian Massif
Údaj o odpovědnosti
    Esther Schmädicke, Bernard Evans
    Evans, Bernard
    Schmädicke, Esther
Zdrojový dokument - seriál
    Contributions to mineralogy and petrology
    Vol. 127, no. 1-2
    p. 57-74
    6 obr., 7 tab., 3 s.bibl.
    Zkr. název ser.: Contr. Mineral. Petrology
Předmětová skupina
    chemismus minerálů
    Český masiv
    fázový diagram
    krušnohorské krystalinikum
    metamorfóza vysokotlaká
    minerály horninotvorné
    podmínky P-T
Geografické jméno
Klíčové slovo
Abstrakt (anglicky)
   Garnet-bearing ultramafic rocks (GBU) enclosed in high-grade gneisses are known from several parts of the Bohemian Massif. One of these is the high-pressure (HP)-unit 1 in the Erzgebirge Mts. Crystalline Complex, which is the subject of the present study. Hitherto, two different models have been put forward to explain the stabilisation of garnet in mantle-derived ultramafic rocks from the Bohemian Massif and their emplacement into the crust. (1) Garnetiferous assemblages were formed in the ultramafics before they came in contact with their crustal host rocks. (2) Garnet was formed in the ultramafics at the expense of spinel due to cooling caused by their tectonic emplacement in the crust. The PT-evolution revealed by the investigated GBU from the Erzgebirge Crystalline Complex, however, requires a third model. The reconstruction of the PT-paths for the Erzgebirge GBU is based on both conventional thermobarometry and phase relations.
   Postulating an in situ HP-metamorphism for the garnet peridotites as result of continental collision during the Variscan orogeny, a crustal thickness of 90-110 km would be required. A comparison of the distribution of eclogites sensu stricto and mantle-derived rocks from the Bohemian Massif together with their reported PT-conditions reveals a correlation between peak PT-conditions in eclogites sensu stricto and the prevailing assemblages in the ultramafic rocks in the same unit
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
Datum vložení
    21. 3. 2008
Datum importu
    8. 8. 2012