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Dioritic intrusions of the Slavkovský les (Kaiserwald), Western Bohemia: their origin and significance in late Variscan granitoid magmatism

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Abstract

Mafic and intermediate intrusions occur in the Slavkovský les as dykes, sills and minor tabular bodies emplaced in metamorphic rocks or enclosed in late Variscan granites near the SW contact of the Western Krušné hory/Erzgebirge granite pluton. They are similar in composition and textures to the redwitzites defined in NE Bavaria. Single zircon Pb-evaporation analyses constrain the age of a quartz monzodiorite at 323.4 ± 4.4 Ma and of a granodiorite at 326.1 ± 5.6 Ma. The P–T range of magma crystallization is estimated at ~1.4–2.2 kbar and ~730–870°C and it accords with a shallow intrusion level of late Variscan granites but provides lower crystallization temperatures compared to the Bavarian redwitzites. We explain the heterogeneous composition of dioritic intrusions in the Slavkovský les by mixing between mafic and felsic magmas with a minor effect of fractional crystallization. Increased K, Ba, Rb, Sr and REE contents compared to tholeiitic basalts suggest that the parental mafic magma was probably produced by melting of a metasomatised mantle, the melts being close to lamprophyre or alkali basalt composition. Diorites and granodiorites originated from mixed magmas derived by addition of about 25–35 and 50 vol.%, respectively, of the acid end-member (granite) to lamprophyre or alkali-basalt magma. Our data stress an important role of mafic magmas in the origin of late Variscan granitoids in NW Bohemian Massif and emphasize the effect of mantle metasomatism on the origin of K-rich mafic igneous rocks.

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Acknowledgments

The work was done under the financial support of the projects 205/02/0458, 205/05/0156 of the Grant Agency of the Czech Republic and Scientific Project of Ministry of Education, Youth and Sports ČR No. 0021620855. David Dolejš is gratefully thanked for helpful discussion. We appreciate the comments of three anonymous reviewers who significantly improved the original version of the manuscript.

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  1. Faculty of Science, Charles University in Prague, Albertov 6, 128 43, Prague 2, Czech Republic

    Pavla Kováříková, Emil Jelínek, Miroslav Štemprok, Václav Kachlík, František V. Holub & Vratislav Blecha

  2. Universität Tübingen, Wilhelmstr. 56, 720 74, Tübingen, Germany

    Wolfgang Siebel

  3. Czech Geological Survey, Geologická 6, 152 00, Prague 5 - Barrandov, Czech Republic

    Pavla Kováříková

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  1. Pavla Kováříková
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Kováříková, P., Siebel, W., Jelínek, E. et al. Dioritic intrusions of the Slavkovský les (Kaiserwald), Western Bohemia: their origin and significance in late Variscan granitoid magmatism. Int J Earth Sci (Geol Rundsch) 99, 545–565 (2010). https://doi.org/10.1007/s00531-008-0406-0

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