Podrobnosti záznamu

Název
    Basic and ultrabasic rocks at the Bohemicum/Moldanubicum boundary along the Central Bohemian Fault
Údaj o odpovědnosti
    Jiří Babůrek
Autor
    Babůrek, Jiří
Další autor; role
   Suk, Miloš
   Původce
Jazyk
    anglicky
Zdrojový dokument - seriál
    Krystalinikum
Svazek/č.
    Vol. 25
Strany
    p. 9-35
Rok
    1999
Poznámky
    6 obr., 1 tab., 12 bibl.
    České resumé
    Zkr. název ser.: Krystalinikum
Předmětová skupina
    amfibolit
    bohemikum
    chemismus hornin
    diorit
    gabro
    moldanubikum Šumavy
    petrogeneze
    složení subalkalické
    složení tholeiitické
    ultrabazika
Geografické jméno
    Brtí (Klatovy)
    ČR-Čechy
    Kdyně (Domažlice)
    Nýrsko (Klatovy)
    Orlovice (Domažlice)
    Smržovice (Domažlice)
    SRN-Bayern
    Všeruby (Domažlice)
Klíčové slovo
    Along
    Basic
    Bohemian
    Bohemicum/Moldanubicum
    Boundary
    Central
    Fault
    Rocks
    Ultrabasic
Abstrakt (anglicky)
   Intrusive basic rocks of the Neukirchen-Kdyně Massif (Bohemicum) have in general basaltic composition and subalkaline tholeiitic character. Gabbros of the Neukirchen-Kdyně Massif are feldspar cumulates related to their pronounced positive Eu-, Ba- and Sr-anomaly. Diorites and quartz diorites have progressively andesitic to dacitic composition. Amphibolites close to dioritic bodies somewhat farther from Central Bohemian Fault (CBF) into the Bohemicum have similar geochemistry with intrusive basic rocks and could thus be recognized as "metagabbros" or "gabbroamphibolites", respectively. Amphibolites close to CBF in the eastern extension of amphibolitic massif Hoher Bogen correspond to IAT - ocean floor basalts as published by Propach (1998). Amphibolites in Moldanubicum, close to CBF have basaltic subalkaline tholeiitic composition and amphibolites from the two-mica gneisses of Královský Hvozd Unit (KHU) having basaltic subalkaline calcalkaline character.
   Both are geochemically very similar to those of Bohemicum with exception of much higher contents of REE in the Moldanubian amphibolites probably due to contamination of neighbouring gneisses in which they build up just thin layers. In contrast, the majority of amphibolites from the Strážov Varied Group have alkaline basaltic composition. Ultramafites along CBF have character of cumulative komatiites. Amphibolites from the Rittsteig drilling carried out through the CBF correspond in the whole depth of drilling (around 550 m) to those of Bohemicum. Ultramafic pyroxenite at Brtí from the Moldanubian Strážov Varied Group has probably origin from the lower crust and could document the very beginning of the differentiation row of the basic intrusive rocks such as Všeruby Massif belonging to Bohemian Neukirchen-Kdyně Complex. The differentiation processes in the lower crust could be thus similar both in Bohemicum and in Moldanubicum
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    14. 1. 2008
Datum importu
    8. 8. 2012