Record details

Title
    Mineralogy and petrogenesis of a Ba-Ti-Zr-rich peralkaline dyke from Šebkovice (Czech Republic): Recognition of the most lamproitic Variscan intrusion
Author
    Cempírek, Jan
    Gadas, Petr
    Havlín, Aleš
    Houzar, Stanislav
    Krmíček, Lukáš
    Krmíčková, Michaela
    Přichystal, Antonín
Language
    anglicky
Publication type
    článek v periodiku
Source title - serial
    Lithos
Vol./nr.
    Roč. 121, č. 1-4
Pages
    13
Year
    2011
Thesaurus term
    Lamproite, Potassic amphibole, Baotite, Henrymeyerite, Benitoite, Bazirite
Keyword
    Ba-Ti-Zr-rich
    Czech
    Dyke
    Intrusion
    Lamproitic
    Mineralogy
    Most
    Peralkaline
    Petrogenesis
    Recognition
    Republic
    Šebkovice
    Variscan
Abstract (in english)
   A peralkaline, ultrapotassic dyke found at Šebkovice is a mineralogically extreme member of a dyke swarm occurring along the SE border of the Moldanubian Region of the Bohemian Massif. The dyke shows a simple zoning with a very fine-grained marginal zone grading into a medium-grained central zone. It has a primary mineral assemblage of microcline and potassic amphiboles with accessory apatite and altered phlogopite. The core of the dyke and late veinlets contain unique late- to post-magmatic Ba-Ti-Zr-bearing mineral assemblages of baotite, henrymeyerite, titanite, rutile, benitoite and bazirite. In terms of a mineralogical-genetic classification, the Šebkovice dyke can be considered as a new high-silica variety of lamproite and represents a unique expression of post-collisional potassic magmatism on the south-eastern border of the Bohemian Massif. In terms of the modern classification of lamproites, the Šebkovice dyke is the first lamproite recognised in the Variscan orogenic belt.
Contributor
    Česká geologická služba
Contributor code
    ČGS (RIV)
Source format
    R
Import date
    15. 10. 2014