Podrobnosti záznamu

Název
    Late-orogenic magmatism in the southern Bohemian Massif - geochemical and isotopic constraints on possible sources and magma evolution
Údaj o odpovědnosti
    Axel Gerdes, Friedrich Finger, Gerhard Wörner
Další názvy
    Proceedings of the International Conference "Genetic Significance of Phosphorus in Fractionated Granites" (IGCP Project No.373) (Variant.)
Autor
    Finger, Friedrich
    Gerdes, Axel
    Wörner, Gerhard
Jazyk
    anglicky
Zdrojový dokument - seriál
    Acta Universitatis Carolinae, Geologica
Svazek/č.
    Vol. 42, no. 1
Strany
    p. 41-45
Rok
    1998
Poznámky
    3 diagr., 27 bibl.
    Zkr. název ser.: Acta Univ. Carol., Geol.
Předmětová skupina
    datování Ar/Ar
    datování Rb/Sr
    datování U/Pb
    granitoidy
    intruze
    magma
    moldanubický pluton
    vlastnosti chemické
Geografické jméno
    ČR-Morava
    Rakousko-Niederösterreich
Klíčové slovo
    Bohemian
    Constraints
    Evolution
    Geochemical
    Isotopic
    Late-orogenic
    Magma
    Magmatism
    Massif
    Possible
    Sources
    Southern
Abstrakt (anglicky)
   Four geochemically and isotopically different intrusive units - Weinsberg, Eisgarn, Rastenberg-Třebíč and Mauthausen - characterize the bulk of the South Bohemian Batholith. Rb-Sr ages, coupled with previously published U-Pb Monazite and Ar-Armuscovite data, indicate a main phase of plutonism at around 330-320 Ma and a second magmatic pulse at c.300 Ma (Mauthausen plutons). Major- and trace-element data, as well as stable and radiogenic isotopes suggest that the Weinsberg, Eisgarn and Mauthausen granitoids had formed by high-T fluid-absent melting from different crustal sources. However, each of these three granitoid groups consists also of several subunits, which show internal geochemical and isotopic homogeneity but differ significantly from each other. This indicates that the crustal sources were fairly heterogeneous, and homogenisation of larger batches of magma could have occurred only during partial melting, melt extraction, and or, ascent.
   Evidence for mixing of mafic and felsic magmas was found in the Rastenberg pluton. The mafic end-member was enriched isotopically and geochemically, suggesting a derivation from lithospheric mantle. Our data from the Rastenberg pluton show that, where mixing between mantle and crustal melts did occur, it resulted in unequivocal petrographic, chemical and isotopic features
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    18. 2. 2008
Datum importu
    8. 8. 2012