Podrobnosti záznamu

Název
    Large-scale, late-magmatic albitization and mineralization of Eisgarn granite concurrent with regional extension deformation of a marginal segment of the Moldanubian Batholith
Údaj o odpovědnosti
    Stanislav Vrána
Další názvy
    Proceedings of the International Conference "Genetic Significance of Phosphorus in Fractionated Granites" (IGCP Project No.373) (Variant.)
Autor
    Vrána, Stanislav
Jazyk
    anglicky
Zdrojový dokument - seriál
    Acta Universitatis Carolinae, Geologica
Svazek/č.
    Vol. 42, no. 1
Strany
    p. 178-180
Rok
    1998
Poznámky
    1 obr., 1 diagr., 1 tab., 7 bibl.
    Zkr. název ser.: Acta Univ. Carol., Geol.
Předmětová skupina
    albit
    albitizace
    chemismus hornin
    eisgarnský granit
    fosfor
    granit
    moldanubický pluton
Geografické jméno
    ČR-Čechy
    Rožmberk nad Vltavou (Český Krumlov)
Klíčové slovo
    Albitization
    Batholith
    Concurrent
    Deformation
    Eisgarn
    Extension
    Granite
    Large-scale
    Late-magmatic
    Marginal
    Mineralization
    Moldanubian
    Regional
    Segment
Abstrakt (anglicky)
   The newly recognized albitized granite segment 2 km of Rožmberk n. Vlt., approximately 6 km2 in size, represents probably the largest body of alkali feldspar, phosphorus-enriched granite associated with Eisgarn granite in the Czech part of the Bohemian Massif. The rocks show increase in concentration of elements typical of evolved fractions of granite magma (residual melts and fluids): P, B, Sn, Nb, Be and rare spikes of high P, Li, and Be, manifested in the presence of sarcopside, graftonite, spodumene and beryl. Unlike several other Variscan alkali feldspar granite intrusions (e.g. Homolka granite, Breiter and Scharbert 1995), which solidified from batches of highly differentiated melts, this body evolved its alkali feldspar mineralogy owing to late-magmatic, syn-deformation (D4-M4) albitization of Eisgarn granite and associate leucogranites.
   Poor exposure imposes some limits on present interpretation of relations among several types of leucocratic granite but does not invalidate the observation that many of the samples fit a series from muscovite-biotite granite to albite granite often enriched in phosphorus. The albitization pre-dates intrusion of alkali feldspar granites of the Homolka type. The studied rocks are an interesting new member of the wider family of Variscan alkali feldspar granites in the Moldanubian Batholith
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    18. 2. 2008
Datum importu
    8. 8. 2012