Počet záznamů: 1

Origin of felsic granulite microstructure by heterogeneous decomposition of alkali feldspar and extreme weakening of orogenic lower crust during the Variscan orogeny

  1. 1.
    0357499 - GFU-E 2011 RIV GB eng J - Článek v odborném periodiku
    Franěk, J. - Schulmann, K. - Lexa, O. - Ulrich, Stanislav - Štípská, P. - Haloda, J. - Týcová, P.
    Origin of felsic granulite microstructure by heterogeneous decomposition of alkali feldspar and extreme weakening of orogenic lower crust during the Variscan orogeny.
    Journal of Metamorphic Geology. Roč. 29, č. 1 (2011), s. 103-130 ISSN 0263-4929
    Grant CEP: GA ČR GA205/09/0539
    Grant ostatní: GA ČR(CZ) GA205/05/2187
    Výzkumný záměr: CEZ:AV0Z30120515
    Klíčová slova: felsic granulites * Moldanubian domain * quantitative microstructural analysis * quartz and feldspar rheology * Variscan belt
    Kód oboru RIV: DB - Geologie a mineralogie
    Impakt faktor: 2.990, rok: 2011

    This study answers the question of origin and evolution of a granulitic microstructure typically developed in felsic granulites of the European Variscan belt. It shows that the precursor of the Variscan felsic granulites was a high-pressure alkali feldspar-rich coarse-grained layered orthogneiss. Its S1 subhorizontal layering is defined by the alignment of alkali feldspar porphyroclasts alternating with monomineralic bands of quartz and bands rich in plagioclase and garnet. The alkali feldspar porphyroclasts contain inclusions of quartz, garnet, kyanite, biotite and rutile, reflecting peak P–T conditions of 1.6–1.8 GPa and 850 °C during S1 formation.
    Trvalý link: http://hdl.handle.net/11104/0195763