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Whole-rock geochemistry of felsic granulites from the Gföhl Unit (Moldanubian Zone, Austria and Czech Republic): petrogenetic implications

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F03%3A00001016" target="_blank" >RIV/00025798:_____/03:00001016 - isvavai.cz</a>

  • Result on the web

  • DOI - Digital Object Identifier

Alternative languages

  • Result language

    angličtina

  • Original language name

    Whole-rock geochemistry of felsic granulites from the Gföhl Unit (Moldanubian Zone, Austria and Czech Republic): petrogenetic implications

  • Original language description

    The felsic granulites with the Variscan (~340 Ma) HP?HT assemblage Grt+Qtz+hypersolvus Fsp+-Ky, correspond geochemically to slightly peraluminous, fractionated granitic rocks. U, Th and Cs are strongly depleted, probably because of the fluid and/or slight melt loss during the HP metamorphism (900?1050 C, 1?5?2?0 GPa). However, the rest of the trace-element contents and variation trends can be explained by fractional crystallisation of a granitic magma. Low Zr and LREE contents yield ~750 C Zrc and Mnz saturation temperatures and suggest relatively low-T crystallisation. The granulites contain radiogenic Sr (Sri=0?7106?0?7706) and unradiogenic Nd (EpsNdi=-4?2 to -7?5), indicating derivation from an old crustal source. The bulk of felsic granulites do not appear to represent separated, syn-metamorphic Variscan HP?HT melts. Instead, they are interpreted as metamorphosed (partly anatectic) equivalents of older, probably high-level granites subducted to continental roots during the Variscan

  • Czech name

    Horninová geochemie a geneze granulitů Gföhlské jednotky (Moldanubikum Českého masivu, Rakousko a Česká republika)

  • Czech description

    Variské felzické granulity Gföhlské jednotky moldanubika geochemicky odpovídají mírně peraluminickým, frakcionovaným granitům. Kromě silného ochuzení U, Th a Cs, což lze připsat na vrub ztrátě fluid při vysokotlaké metamorfóze, lze zastoupení většiny stopových prvků vysvětlit frakcionací granitového magmatu. Nízký obsah Zr a LREE ukazuje na saturační teploty zirkonu a monazitu kolem 750 C. Radiogenní Sr a neradiogenní Nd ukazuje na vznik ze starého korového zdroje. Celý komplex je interpretován jako metamorfované starší variské granity.

Classification

  • Type

    J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

  • CEP classification

    DD - Geochemistry

  • OECD FORD branch

Result continuities

  • Project

    <a href="/en/project/GA205%2F03%2F0040" target="_blank" >GA205/03/0040: Partial melting of rocks in the root zone of the Variscan orogenic belt (Moldanubian zone, Bohemian Massif)</a><br>

  • Continuities

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Others

  • Publication year

    2003

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Mitteilungen der Österreichischen Mineralogischen Gesellschaft

  • ISSN

    1680-8959

  • e-ISSN

  • Volume of the periodical

    148

  • Issue of the periodical within the volume

    podzim

  • Country of publishing house

    AT - AUSTRIA

  • Number of pages

    3

  • Pages from-to

    174-176

  • UT code for WoS article

  • EID of the result in the Scopus database