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

SYSNO ASEP	0357499
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Origin of felsic granulite microstructure by heterogeneous decomposition of alkali feldspar and extreme weakening of orogenic lower crust during the Variscan orogeny
Author(s)	Franěk, J. (CZ) Schulmann, K. (FR) Lexa, O. (CZ) Ulrich, Stanislav (GFU-E) Štípská, P. (FR) Haloda, J. (CZ) Týcová, P. (CZ)
Source Title	Journal of Metamorphic Geology. - : Wiley - ISSN 0263-4929 Roč. 29, č. 1 (2011), s. 103-130
Number of pages	28 s.
Language	eng - English
Country	GB - United Kingdom
Keywords	felsic granulites ; Moldanubian domain ; quantitative microstructural analysis ; quartz and feldspar rheology ; Variscan belt
Subject RIV	DB - Geology ; Mineralogy
R&D Projects	GA205/09/0539 GA ČR - Czech Science Foundation (CSF)
CEZ	AV0Z30120515 - GFU-E (2005-2011)
UT WOS	000285881000006
DOI	10.1111/j.1525-1314.2010.00911.x
Annotation	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.
Workplace	Geophysical Institute
Contact	Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028
Year of Publishing	2011

Number of the records: 1