Podrobnosti záznamu

Název
    Distribution of elements among minerals of a single (muscovite-) biotite granite sample - an optimal approach and general implications
Autor
    Janoušek, V.
    Laufek, František
    Minařík, Luděk
    Navrátil, Tomáš
    Strnad, J.
    Trubač, J.
Jazyk
    anglicky
Typ dokumentu
    článek v odborném periodiku
Zdrojový dokument - seriál
    Geologica Carpathica
Svazek/č.
    Roč. 65, č. 4
Strany
    s. 257-271
Rok
    2014
Poznámky
    Rozsah: 15 s. : P
    Výzkumný záměr: CEZ:AV0Z30130516
Předmětová kategorie
    Central Bohemian Plutonic Complex
    ICP-MS
    modal analyses
    Říčany granite
    trace-element residence
Klíčové slovo
    Approach
    Biotite
    Distribution
    Elements
    General
    Granite
    Implications
    Minerals
    Muscovite-
    Optimal
    Sample
    Single
Abstrakt (anglicky)
   The petrography and mineral chemistry of the coarse-grained, weakly porphyritic (muscovite-) biotite Říčany granite (Variscan Central Bohemian Plutonic Complex, Bohemian Massif) were studied in order to assess the distribu- tion of major and trace elements among its minerals, with consequences for granite petrogenesis and availability of geochemical species during supergene processes. It is demonstrated that chemistry-based approaches are the best suited for modal analyses of granites, especially methods taking into account compositions of whole-rock samples as well as their mineral constituents, such as constrained least-squares algorithm. They smooth out any local variations (mineral zoning, presence of phenocrysts, schlieren?) and are robust in respect to the presence of phenocrysts or fabrics. The study confirms the notion that the accessory phases play a key role in incorporation of many elements during crystalli- zation of granitic magmas.
   Especially the REE seem of little value in petrogenetic modelling, unless the role of acces- sories is properly assessed and saturation models for apatite, zircon, monazite?rutile carefully considered. At the same time, the presence of several P-, Zr- and LREE-bearing phases may have some important consequences for saturation thermometry of apatite, zircon and monazite.
Přispěvatel
    AV ČR Brno, Geologický ústav
Kód přispěvatele
    AV ČR, GLÚ
Zdrojový formát
    U
Datum importu
    23. 10. 2014