Podrobnosti záznamu

Název
    Tourmalinites in the metamorphic complex of the Svratka Unit (Bohemian Massif): a study of compositional growth of tourmaline and genetic relations
Autor
    Buriánek, David
    Čopjaková, Renata
    Houzar, Stanislav
    Škoda, Radek
Jazyk
    anglicky
Typ dokumentu
    článek v periodiku
Zdrojový dokument - seriál
    Journal of Geosciences
Svazek/č.
    Roč. 54, č. 2
Strany
    23
Rok
    2009
Výraz tezauru
    B- F-rich fluids
    Czech Republic
    dravite
    metamorphism
    mica schist
    schorl
    Svratka Unit
    tourmalinite
Klíčové slovo
    Bohemian
    Complex
    Compositional
    Genetic
    Growth
    Massif
    Metamorphic
    Relations
    Study
    Svratka
    Tourmaline
    Tourmalinites
    Unit
Abstrakt (anglicky)
   Tourmalinites from the Svratka Unit form stratiform layers hosted in mica schists. The chemical composition of tourmaline from tourmalinites varies from Al-rich schorl to dravite. The tourmaline usually exhibits three compositional domains, which are, from centre to the rim: a chemically inhomogeneous brecciated core (zone I), a volumetrically minor internal rim zone II, and a dominant outermost zone III. The compositional variability of tourmaline in all the zones is controlled by the (X YAl WOH) (XNa Y Mg WF)-1 and YFeYMg-1 substitutions. The tourmaline of the zone I corresponds to highly vacanced X-site, Al-rich schorl with lower F (up to 0.43 apfu), which is interpreted as an older, low-temperature hydrothermal tourmaline. Tourmaline of the zone II corresponds to dravite rich in F (reaching up to 0.66 apfu) crystallizing during the prograde metamorphism. Lastly, the Al-rich schorl-dravite of the zone III, grew most likely during retrograde metamorphism.
Přispěvatel
    MU Brno, Přírodovědecká fakulta
Kód přispěvatele
    MU, PřF
Zdrojový formát
    R
Datum importu
    8. 8. 2012