Podrobnosti záznamu

    Apatite from granitic pegmatite exocontacts in Moldanubian serpentinites
Údaj o odpovědnosti
    Petr Černý, Brian J. Fryer
Další názvy
    Apatit v exokontaktech granitických pegmatitů v moldanubických serpentinitech
    Chapman, Ron
    Černý, Petr
    Fryer, Brian J.
Zdrojový dokument - seriál
    Journal of the Czech Geological Society
    Vol. 46, no. 1-2
    p. 15-20
    2 obr., 3 tab., 30 bibl.
    České resumé
    Zkr. název ser.: J. Czech geol. Soc.
Předmětová skupina
    chemismus hornin
    moldanubikum strážecké
    složení granitické
    vzácné zeminy
Geografické jméno
    Heřmanov (Žďár nad Sázavou)
    Věchnov (Žďár nad Sázavou)
    Věžná (Žďár nad Sázavou)
Klíčové slovo
Abstrakt (anglicky)
   eochemical features of apatite from three contact assemblages of granitic pegmatites intersecting serpentinized peridotites were examined to test their dependence on the character of the pegmatites, which are considerably modified by reaction with the ultrabasic host rocks. The cation content of all three apatite samples does not deviate from the usual Ca-rich composition with only negligible Fe, Mn, Mg, Na and traces of Si, U, Th and Pb. However, the REE and Y contents are quite variable among the three occurrences. In the oligoclase+phlogopite assemblage of the contact of the Věžná I pegmatite, the Fap 81 OHap 18 Clap1 apatite contains minor Y, REE, Fe and Mn, conforming to the presence of Y- and REE-bearing minerals in the parent beryl-columbite-subtype pegmatite body.
   In the phlogopite rimming simple plagioclasite veinlets at Věchnov, the REE-poor, HREE- and Y-depleted OHap 59 Clap 28 Fap 13 with FeMn and slightly elevated Sr reflects the geochemically primitive signature of the pegmatites, mobilized from adjacent gneissic lithologies. At Heřmanov, the HREE-depleted Fap 81 OHap 17 Clap associated with phlogopite and minor actinolite is slightly Sr- and Ba-enriched but otherwise rather close to the composition of the Věžná I apatite. This and other evidence suggests that the adjacent quartzo-feldspathic rock may represent a primitive rare-element pegmatite rather than a migmatitic mobilizate
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
Datum vložení
    30. 5. 2007
Datum importu
    8. 8. 2012