Podrobnosti záznamu

Název
    Coexisting Miocene alkaline volcanic series associated with the Cheb-Domažlice Graben (W Bohemia): Geochemical characteristics
Údaj o odpovědnosti
    Jaromír Ulrych, Jana Štěpánková, Felicity E. Lloyd, Kadosa Balogh
Autor
    Balogh, Kadosa
    Lloyd, Felicity E.
    Štěpánková, Jana
    Ulrych, Jaromír
Jazyk
    anglicky
Zdrojový dokument - seriál
    Geologica carpathica
Svazek/č.
    Vol. 54, no. 1
Strany
    p. 53-64
Rok
    2003
Poznámky
    7 obr., 2 tab., 22 bibl.
    il.
    Zkr. název ser.: Geol. carpath.
Předmětová skupina
    alkalický typ
    analýza petrografická
    chemismus hornin
    horniny vulkanické
    kenozoické vulkanity Českého masivu
    miocén
    vulkanismus
    zóna riftová
Geografické jméno
    Cheb
    ČR-Čechy
    Domažlice
Klíčové slovo
    Alkaline
    Associated
    Bohemia
    Characteristics
    Cheb-Domažlice
    Coexisting
    Geochemical
    Graben
    Miocene
    Series
    Volcanic
Abstrakt (anglicky)
   The Middle to Late Miocene intraplate alkaline volcanism of W Bohemia is associated with the uplift of the NE flank of the Cheb-Domažlice Graben. Two coexisting cogenetic volcanic series have been recognized there: (i) weakly alkaline series (WAS) basanite-trachybasalt-(basaltic) trachyandesite-trachyte-rhyolite (15.9-11.4 Ma) and (ii) strongly alkaline series (SAS) olivine nephelinite-tephrite (16.5-8.3 Ma). Similar patterns in olivine nephelinite and basanite Primitive Mantle-normalized incompatible trace elements point to a single mantle source that was geochemically similar to Enriched Mantle. Negative Rb and K anomalies probably reflect residual amphibole in the source. Magma modelling showed that olivine nephelinite and basanite could form by different degrees of partial melting of the mantle source, with amphibole, garnet, olivine and clinopyroxene in the residuum. The mantle source was probably represented by lithospheric mantle metasomatized by plume-like material.
   Evolution of the SAS is limited in extent and rather unclear. The WAS is well developed and its evolution can be modelled by fractionation of olivine, clinopyroxene, Fe-Ti oxide, and a small proportion of plagioclase, and in late stages by alkali feldspar, Fe-Ti oxide, clinopyroxene and apatite. Crustal contamination cannot be ruled out but there is no substantial evidence of this in felsic derivatives
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    13. 2. 2008
Datum importu
    8. 8. 2012