Podrobnosti záznamu

Název
    Petrogeneze nasavrckého masívu
Údaj o odpovědnosti
    Miroslav Knotek
Další názvy
    Petrogenesis of the Nasavrky massif
Autor
    Knotek, Miroslav
Jazyk
    česky
Zdrojový dokument - monografie
    Horniny ve vědách o Zemi
Strany
    s. 141-147
Poznámky
    1 obr., 25 bibl.
    Anglické resumé
Předmětová skupina
    diorit
    gabro
    granitoidy
    konference
    petrogeneze
    vrásnění kadomské
    vrásnění variské
    železnohorské krystalinikum
Geografické jméno
    ČR-Čechy
    Nasavrky (Chrudim)
Klíčové slovo
    Masívu
    Nasavrckého
    Petrogeneze
Abstrakt (anglicky)
   The Nasavrky massif, situated in the south-eastern part of the Železné hory Mts., E-Bohemia, covers an area of about 200 km2. It is built up of a number of plutonic rocks related to several generations. In the northern part of the massif, red and texturally varied, mostly potassium-rich biotite granites prevail. They represent a posttectonic subvolcanic intrusion and penetrate into the adjacent tonalite-granodiorites in the form of aphophyses and veins. At the contact with the tonalite-granodiorite body of the middle part of the massif,a texturally and structurally varied belt contain xenoliths of originally pyroxene gabbro of an older intrusive phase and blocks of oriented meladiorites derived from amphibolites. The middle part of the massif is a complicated tonalite-granodiorite body. Its northern margin is formed by a rim of medium-grained hornblende-biotite tonalites and melagranodiorites with a various degree of preferred orientation.
   In the southern part of the massif, older and deformed rocks of Cadomian age emerge. The Caledonian age of the rocks is indicated by their increased sodium content. In the Variscan part of the Nasavrky massif (of its northern and middle part) marginal gabbros and xenoliths of the gabbro-diorite association are the oldest rocks. The Variscan magmatic cycle began with small-grained hornblende-biotite granodiorites to quartz diorites and biotite granodiorites containing hornblende. The medium-grained hornblende-biotite granodiorites contaiminated at the contact by the rocks of the gabbro-diorite belt and furthermore biotite granodiorites were the next intrusive phase. The Variscan cycle was closed by granites of the northern part of the massif
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    25. 3. 2008
Datum importu
    8. 8. 2012