Record details

Title
    Modelling Diverse Processes in the Petrogenesis of a Composite Batholith: the Central Bohemian Pluton, Central European Hercynides
Statement of responsibility
    Vojtěch Janoušek, D.R. Bowes, Graeme Rogers, Colin M. Farrow, Emil Jelínek
Author
    Bowes, D. R.
    Farrow, Colin M.
    Janoušek, Vojtěch, 1968-
    Jelínek, Emil, 1943-
    Rogers, Graeme
Language
    anglicky
Source title - serial
    Journal of petrology
Vol./nr.
    Vol. 41, no. 4
Pages
    p. 511-543
Year
    2000
Notes
    17 obr., 4 tab.
    il.
    Obsahuje bibliografické odkazy
    Zkr. název ser.: J. Petrology
Subject group
    chemismus hornin
    geochemie izotopická
    granitoidy
    izotopy Sr
    krystalizace frakcionovaná
    petrogeneze
    pluton
    původ plášťový
    středočeský pluton
    subdukce
Geographical name
    ČR-Čechy
Keyword
    Batholith
    Bohemian
    Central
    Composite
    Diverse
    European
    Hercynides
    Modelling
    Petrogenesis
    Pluton
    Processes
Abstract (in english)
   The multiple intrusions making up the Central Bohemian Pluton in the Central European Hercynides have petrographic and geochemical features consistent with the presence of four main granitoid suites. Major-element, trace-element and Sr-Nd isotopic compositions are used to model their petrogenesis. Partial melting of metabasic rocks or of a CHUR-like mantle source are interpreted to have produced melts parental to the most primitive calc-alkaline Sázava suite. Interaction of basic with more acidic magmas followed by extensive amphibole-plagioclase-dominated fractionation accouts for the production of trondhjemites. Alternatively, the trondhjemites corrspond to small-degree melts of a metabasic source. AFC (assimilation-fractional crystallization) modelling with a paragneiss as a contaminant and increasing DNd values simulated the characteristics of the Blatná suite.
   Closed-system fractionation of strongly enriched mantle-derived magmas or their interaction with leucogranitic melts is deduced for the petrogenesis of the shoshonitic Čertovo břemeno suite. Partial metling of a metasedimentary source, followed by K-feldspar-dominated fractionation, accounts for the granites of the Říčany suite. The progression from relatively primitive calc-alkaline granitoids towards evolved, K-rich calc-alkaline and shoshonitic rocks is interpreted to reflect the increasing enriched mantle input in the petrogenesis of the later suites. The evidence for Hercynian subduction is equivocal and the mantle enrichment could have been significantly older
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    26. 4. 2007
Import date
    8. 8. 2012