Record details

Title
    Trace elements and growth patterns in quartz: a fingerprint of the evolution of the subvolcanic Podlesí Granite System (Krušné hory Mts., Czech Republic)
Statement of responsibility
    Axel Müller, Andreas Kronz, Karel Breiter
Author
    Breiter, Karel, 1956-
    Kronz, Andreas
    Müller, Axel
Language
    anglicky
Source title - serial
    Věstník Českého geologického ústavu (Bulletin of the Czech Geological Survey)
Vol./nr.
    Roč. 77, č. 2
Pages
    s. 135-145
Year
    2002
Notes
    3 obr., 3 fot., 3 tab., 2 s. bibl.
    il.
    Zkr. název ser.: Věst. Čes. geol. Úst. (Bull. Czech geol. Surv.)
Subject group
    chemismus hornin
    diferenciace magmatická
    granit
    krušnohorský pluton
    krystalizace frakcionovaná
    křemen
    prvky stopové
    vzorek celé horniny
Geographical name
    ČR-Čechy
    Krušné hory
    Podlesí (Karlovy Vary)
Keyword
    Czech
    Elements
    Evolution
    Fingerprint
    Granite
    Growth
    Hory
    Krušné
    Mts
    Patterns
    Podlesí
    Quartz
    Republic
    Subvolcanic
    System
    Trace
Abstract (in english)
   he Podlesí Granite System (PGS) in the Western Krušné hory Mts., Czech Republic, represents a suite of late-Variscan, highly fractionated rare-metal granites. Based on textural studies and cathodoluminescence five igneous quartz populations can be distinguished in the stock granite and the more evolved dyke granite hosting line rocks (layered granites). Trace element profiling by electron probe micro-analysis (EPMA) gives evidence for three main crystallisation stages: (1) the zoned quartz phenocrysts representing the early stage of magma evolution in the middle crust, (2) the stockschneider quartz and groundmass quartz of the stock granite reflecting the subvolcanic solidification conditions of the stock granite, and (3) the zoned snowball quartz and comb quartz of the dyke granite crystallised from a highly evolved, residual melt. Ti and Al in quartz show a general temporal trend reflecting the evolution of the magma: decrease of Ti and increase of Al.
   The increase of lithophile elements (Li, Na, Al, P, K) and of the water content in the magma, the decrease of Ti, crystallisation temperature and pressure are assumed to be predominantly responsible for the trend. High Al in quartz (500 ppm) may also result from high crystal growth rate. The textural varieties of the PGS in general are not a product of metasomatic overprinting, but a product of crystallisation of different fractionated melts
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    28. 3. 2008
Import date
    8. 8. 2012