Record details

    Izotopová geochemie a geochronologie skarnu ze Slatiny (24-33 Moravský Krumlov)
Statement of responsibility
    Vojtěch Janoušek, Jaroslava Pertoldová, Zdeněk Pertold
Other titles
    Isotopic geochemistry and geochronology of the skarn from Slatina, Moldanubian zone of the Bohemian Massif
    Janoušek, Vojtěch, 1968-
    Pertold, Zdeněk
    Pertoldová, Jaroslava
Source title - serial
    Zprávy o geologických výzkumech v roce 1999
    s. 53-54
    1 diagr., 9 bibl.
    Anglické resumé
    Zkr. název ser.: Zpr. geol. Výzk. v Roce 1999.
Subject group
    chemismus hornin
    datování Sm/Nd
    izotopy Sr
    moldanubikum západní Moravy
Geographical name
    Slatina (Znojmo)
Abstract (in english)
   Nd isotopic dating of garnet-pyroxene skarn from Slatina (20 km N of Znojmo, Gföhl nappe of the Moldanubian unit) indicates a major metamorphic event at 415 ˝ 24 Ma (2ň; WR-grt-cpx isochron with MSWD = 0.07). This is, within an error, identical with an age calculated on the basis of the grt-WR pair only (420 ˝ 42 Ma) and resemles Sm-Nd metamorphic ages of eclogite and granulite from Winklarn, Bavaria (von QUADT - GEBAUER 1993). As the closure temperature of the Nd diffusion in garnet is high (MEZGER 1990, HENSEN - ZHOU 1995), the obtained ages are interpreted as being close to the garnet growth during the high-grade metamorphism. Significantly lower e415Nd for zircon (-8.4) compared to WR, cpx and grt (-7.3) probably indicates presence of older, inherited cores, which are indeed observable in the BSE.
   High Sr initial ratio (87Sr/86SR415 ~ 0.713), and, above all, the low ţ415Nd (-7.3) and high two-stage Nd model age (T DMNd = 1.7 Ga; LIEW - HOFMANN 1988) support a long crustal residence of the protolith and rule out its direct derivation from depleted or CHUR-like mantle in Silurian-early Devonian times
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    15. 3. 2007
Import date
    8. 8. 2012