Podrobnosti záznamu

Název
    Tertiary alkaline Roztoky Intrusive Complex, České středohoří Mts., Czech Republic: petrogenetic characteristics
Autor
    Ackerman, Lukáš
    Dostal, J.
    Hegner, E.
    Jelínek, E.
    Řanda, Zdeněk
    Skála, Roman
    Ulrych, Jaromír
Jazyk
    anglicky
Typ dokumentu
    článek v odborném periodiku
Zdrojový dokument - seriál
    International Journal of Earth Sciences
Svazek/č.
    Roč. 103, č. 5
Rok
    2014
Poznámky
    Projekt: IAA300130902, GA AV ČR3cav_un_auth*0252838
    Rozsah: 30 s. : E
Předmětová kategorie
    alkaline intrusions
    Bohemian Massif
    Cenozoic
    continental rift
    geochemistry
    Roztoky Intrusive Complex
Klíčové slovo
    Alkaline
    Characteristics
    Complex
    Czech
    České
    Intrusive
    Mts
    Petrogenetic
    Republic
    Roztoky
    Středohoří
    Tertiary
Abstrakt (anglicky)
   The České středohoří Mts. is the dominant volcanic center of the Ohře (Eger) rift zone. It hosts the Roztoky Intrusive Complex (RIC), which is made up of a caldera vent and intrusions of 33-28-Ma-old hypabyssal bodies of essexite-monzodiorite-sodalite syenite series accompanied by a radially oriented 30-25-Ma-old dike swarm comprising about 1,000 dikes. The hypabyssal rocks are mildly alkaline mostly foid-bearing types of mafic to intermediate compositions. The dike swarm consists of chemically mildly alkaline and rare strongly alkaline rocks (tinguaites). The geochemical signatures of the mildly alkaline hypabyssal and associated dike rocks of the RIC are consistent with HIMU mantle sources and contributions from lithospheric mantle. The compositional variations of essexite and monzodiorite can be best explained by fractional crystallization of parent magma without significant contributions of crustal material.
   On the other hand, the composition of monzosyenite, leuco-monzodiorite and sodalite syenite reflects fractional crystallization coupled with variable degrees of crustal assimilation. It is suggested that the parent magmas in the Ohře rift were produced by an adiabatic decompression melting of ambient upper mantle in response to lithospheric extension associated with the Alpine Orogeny.
Přispěvatel
    AV ČR Brno, Geologický ústav
Kód přispěvatele
    AV ČR, GLÚ
Zdrojový formát
    U
Datum importu
    23. 10. 2014