Podrobnosti záznamu

Název
    Rare earth elements as indicators of premetamorphic mineral composition of orthoamphibolites
Údaj o odpovědnosti
    Dušan Němec
Autor
    Němec, Dušan, 1927-2001
Jazyk
    anglicky
Zdrojový dokument - seriál
    Scripta facultatis scientiarum naturalium Universitatis Masarykianae brunensis
Svazek/č.
    Vol. 24
Strany
    p. 45-54
Rok
    1994
Poznámky
    5 diagr., 21 bibl.
    Zkr. název ser.: Scr. Univ. Masaryk. brun., Geol.
Předmětová skupina
    klinopyroxeny
    ortoamfibolit
    petrogeneze
    protolit
    vzácné zeminy
Klíčové slovo
    Composition
    Earth
    Elements
    Indicators
    Mineral
    Orthoamphibolites
    Premetamorphic
    Rare
Abstrakt (anglicky)
   Many orthoamphibolites exhibit REE, patterns characterized by step increase of abundacies from (La)CN to (Ce)CN followed by slight increase towards HREE or by constant values of chondrite-normalized REE. Such a REE distribution differs markedly from REE pattern of amphibole, the major constituent of amphibolites. The former REE distribution is typical of magmatogenous calcic clinopyroxene. In amphibolites is evidently inherited from the original clinopyroxene dominated basic igneous protolith. Some amphibolites also show REE pattern with the (La)CN/CE)CN ration equalling one, or even greater than one. However, this does not imply the absence of clinopyroxene as a major constituent in the original protolith. There exist, for instance, also alkaline pyroxene basalts, in which the REE distribution is determined by other minerals, especially by some accessories rich in REE.
   - Simultasneously, the REE patterns of amphibolites having REE signature of clinopyroxene are suggestive of isochemical regional metamorphism of the rock
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    21. 2. 2008
Datum importu
    8. 8. 2012