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The Blaník Gneiss in the southern Bohemian Massif (Czech Republic): a rare rock composition among the early palaeozoic granite of Variscan Central Europe
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SYSNO ASEP 0463456 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title The Blaník Gneiss in the southern Bohemian Massif (Czech Republic): a rare rock composition among the early palaeozoic granite of Variscan Central Europe Author(s) René, Miloš (USMH-B) RID, ORCID, SAI
Finger, F. (AT)Source Title Mineralogy and Petrology. - : Springer - ISSN 0930-0708
Roč. 110, č. 4 (2016), 503-514Number of pages 12 s. Publication form Print - P Language eng - English Country AT - Austria Keywords leucogranite ; turmaline ; petrology ; geochemistry ; Bohemian Massif Subject RIV DB - Geology ; Mineralogy R&D Projects ME 555 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support USMH-B - RVO:67985891 UT WOS 000381084400005 EID SCOPUS 84954470207 DOI 10.1007/s00710-016-0427-5 Annotation Metamorphosed and deformed tourmaline-bearing leucogranites with a Cambro-Ordovician formation age are widespread in the Monotonous Group of the Variscan southern Bohemian Massif, Czech Republic. The rocks, known locally as Blanik gneiss, are strongly peraluminous and classify as phosphorus-rich low-T, S-type granite. The magma formed from a metapelitic source, most likely through muscovite dehydration melting. With respect to its low-T origin and the abundance of tourmaline, the Blanik gneiss is exotic within the spectrum of Early Palaeozoic granites of the Variscan fold belt of Central Europe. Coeval granitic gneisses in the neighbouring Gfohl unit of the Bohemian Massif can be classified as higher T S-type granites and were probably generated through biotite dehydration melting. The geochemical differences between the Early Palaeozoic granitic magmatism in the Gfohl unit and the Monotonous Group support models claiming that these two geological units belonged to independent peri-Gondwana terranes before the Variscan collision. It is suggested here, that the Gfohl unit and the Monotonous Group represent zones of higher and lower heat flow within the Early Palaeozoic northern Gondwana margin, respectively. The geochemical data presented in this study could be helpful for terrane correlations and palaeogeographic reconstructions. Workplace Institute of Rock Structure and Mechanics Contact Iva Švihálková, svihalkova@irsm.cas.cz, Tel.: 266 009 216 Year of Publishing 2017
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