Record details

Title
    Apatite Enrichment in Nephelinite from Slánská Hora Hill, Central Bohemia
Statement of responsibility
    Jiří K. Novák, Dobroslav Matějka
Other titles
    Magmatism and Rift Basin Evolution (Variant.)
Author
    Matějka, Dobroslav
    Novák, Jiří K.
Language
    anglicky
Source title - serial
    Geolines
Vol./nr.
    Vol. 9
Pages
    p. 104-109
Year
    1999
Notes
    2 diagr., 4 tab., 26 bibl.
Subject group
    apatit
    chemismus minerálů
    diatrema
    fosfor
    kenozoické vulkanity Českého masivu
    minerály horninotvorné
    nefelinit
    petrogeneze
    původ plášťový
    ultrabazika
    xenolit
Geographical name
    ČR-Čechy
    Pražská plošina-Slánská hora
    Slaný (Kladno, Slaný)
Keyword
    Apatite
    Bohemia
    Central
    Enrichment
    Hill
    Hora
    Nephelinite
    Slánská
Abstract (in english)
   The Cenozoic diatreme of Slánská hora Hill represents an extraordinary phosphorus anomaly (3.90-5.07 wt% P2O5 9.5-11.6% of normative apatite) among alkaline volcanic rocks of the Bohemian Massif. The olivine-poor nephelinite (melanephelinite) from central part of the diatreme contains (i) large hydroxyl-fluorapatite crystal (up to 1.8 mm long) in digested harzburgite microxenoliths (about 2 mm in diameter), (ii)partly resorbed individual hydroxyl-fluorapatite (0.05-0.1 mm) in matrix derived from disintegrated microxenoliths and (iii) microcrystalline hydroxyl-chlorapatite inclusions (7-30 m in size) in silicates of the nephelinite matrix. Apatite from the nephelinite dyke corresponds to hydroxyl-chlorapatite reflecting a change in Cl/F ratio. The apatite-rich ultramafic microxenoliths are likely related to metasomatized upper mantle source
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    21. 3. 2008
Import date
    8. 8. 2012