Record details

Title
    Magmatic and hydrothermal evolution of Li-F granites: Cínovec and Krásno intrusions, Krušné hory batholith, Czech Republic
Statement of responsibility
    David Dolejš, Miroslav Štemprok
Author
    Dolejš, David
    Štemprok, Miroslav
Language
    anglicky
Source title - serial
    Věstník Českého geologického ústavu (Bulletin of the Czech Geological Survey)
Vol./nr.
    Vol. 76, no. 2
Pages
    p. 77-99
Year
    2001
Notes
    16 obr., 4 tab., 3 s.bibl.
    České resumé
    il.
    Zkr. název ser.: Věst. Čes. geol. Úst. (Bull. Czech geol. Surv.)
Subject group
    alkalický granit
    chemismus hornin
    feldspatizace
    fluór
    granit
    greizenizace
    krušnohorský pluton
    krystalizace frakcionovaná
    lithium
    sericitizace
Geographical name
    ČR-Čechy
    Krušné hory
Keyword
    Batholith
    Cínovec
    Czech
    Evolution
    Granites
    Hory
    Hydrothermal
    Intrusions
    Krásno
    Krušné
    Li-F
    Magmatic
    Republic
Abstract (in english)
   Geochemical and stable-isotope data for highly evolved Li-F granites from the Cínovec stock and the Krásno area (Krušné hory batholith) reveal these units as products of prolonged fractional crystallization with subsolidus greisenization, feldspathization or sericitization. The Cínovec stock is characterized by low-P Li-mica granites, primarily separated into lower chemically homogenous protolithionite granites (delta18OWR from 7.6 to 8.4 promile SMOW), and upper evolved zinnwaldite granites (delta18OWRwr from 5.2 to 5.8 promile SMOW), which were produced by 35-50% crystal fractionation with concomitant low-delta18O meteoric-water interaction. Strong lanthanide tetrad effect (TE1,3 1.21-1.51) provides additional evidence for fluid interaction prior to complete solidification.
   The intensity of subsolidus alterations, which are superimposed on the primary magmatic characteristics, increases continuously towards the apical part of the intrusion and is characterized by albitization ( (+2 to +7 absolute wt.% absolute wt.% of albite), K-feldspar and Li-mica decomposition (up to -21 wt.%), sericitization (up to +11 wt.%) and minor mobilization of quartz (-2 to + 4 wt.%). The Čistá intrusion in the Krásno area consists of a high-P zinnwaldite granites delta18OWR 10.4 to 10.7 promile SMOW) with two contrasting alteration trends - greisenization and alkali feldspathization
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    28. 3. 2008
Import date
    8. 8. 2012