Podrobnosti záznamu

Název
    Granulites and Non-granulites : Contribution to the Classification and Nomenclature of Metamorphic Rocks (II)
Údaj o odpovědnosti
    Winfried Lorenz
Další názvy
    Granulite und Nichtgranulite. Ein Beitrag zur Klassifikation und Nomenklatur der Metamorphite (II)
Autor
    Lorenz, Winfried
Jazyk
    anglicky
Zdrojový dokument - seriál
    Chemie der Erde
Svazek/č.
    Vol. 58, no. 1-2
Strany
    p. 98-118
Rok
    1998
Poznámky
    5 obr., 1 tab., 4 s.bibl.
    Německé resumé
    Zkr. název ser.: Chem. d. Erde
Předmětová skupina
    charnockit
    facie granulitová
    granulit
    klasifikace
    krušnohorské krystalinikum
    minerály horninotvorné
    moldanubikum
    rula
    terminologie
Geografické jméno
    Česká republika
    Český Krumlov
    Holubov (Český Krumlov)
    Lišov (České Budějovice)
    Náměšť nad Oslavou (Třebíč)
    Rakousko-Niederösterreich
    SRN-Sachsen
Klíčové slovo
    
    >Contribution
    Classification
    Granulites
    II
    Metamorphic
    Nomenclature
    Non-granulites
    Rocks
Abstrakt (anglicky)
   Granulites are high-grade quartz-feldspar rocks composed of mainly anhydrous Fe-Mg-minerals, and quartz as a mandatory constituent. In pyroxene granulites quartz is also a major component. Related rocks free of quartz should not be called granulites but pyriclasites or pyrigarnites. Granulites are distinguished from gneisses by their fabric, not by their mineral content or mineral facies. High-grade gneisses may be likewise anhydrous (e.g. pyroxene gneisses). Charnockites are high-grade igneous rocks and hence have been included in the classification scheme of the latter. For the classification of granulitic rocks a compositional triangle is suitable similar to that of gneisses and other metamorphic rocks. Thus, a direct comparison is possible between those rocks as well as a passing over from one group of metamorphic rocks to another one or from one mineral facies to a higher or lower one.
   Since quartz-feldspar rocks do not react sufficiently sensitive to alterations of P-T conditions the term "granulite facies" is a highly unfortunate one. The type rock granulite does not exhibit mineral assemblages diagnostic of the granulite facies and, thus, granulite facies is not reproductible from its name-giving rock. Against that, the term "pyriclasite facies" (Zoubek), e.g., would meet the condition of a petrographically correct terminology. Nevertheless, the petrographic rock designation "granulite" is well established and can be reproductibly applied to rocks of the Bohemian Massif type region and likewise to ancient shields
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    25. 3. 2008
Datum importu
    8. 8. 2012