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Geochronology and petrogenesis of orthogneisses from the Pacov body: implications for the subdivision of the Cambro-Ordovician peraluminous magmatism and related mineralizations in the Monotonous and Varied units of the Moldanubian Zone (Bohemian Massif)

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Abstract

Peraluminous orthogneisses represent a typical rock type of the Monotonous and Varied units of the Moldanubian Zone. The most probable setting for the generation of these rocks is the Cambro-Ordovician magmatic event linked to crustal anataxis, which is related to the thermal relaxation of thickened continental crust. According to their geological position, the mineralogy and geochemistry can be traced to the Blaník and Deštná type orthogneisses. The Blaník type is represented by muscovite-biotite to muscovite-tourmaline orthogneisses whose granitic protolith can be generated by muscovite-dominant dehydration melting of metapelites. The chemical heterogeneity of this type suggests magma differentiation, which is manifested by the presence of P-Li-Sn-Nb mineralization. Muscovite-biotite to biotite Deštná type orthogneisses were likely generated by the fluid-present melting of immature crustal sources (e.g. metagreywackes and metaigneous rocks) and spatially related to small occurrences of W-bearing mineralization. We applied whole-rock geochemistry combined with mineralogy and zircon U-Pb geochronology to the evolutionary interpretation of one of the most fractionated bodies of Deštná type orthogneisses situated near the village of Pacov. The Pacov orthogneiss is accompanied by pre-Variscan greisens and related tungsten mineralization (ferberite, scheelite, pyrite, and native bismuth). The mineral assemblages of these rock types are modified by the Variscan metamorphic overprint (720 ± 75 °C at 0.65 ± 0.29 GPa). Two petrographically distinct samples of orthogneisses give U–Pb zircon ages of 494 ± 2 Ma (garnet-muscovite orthogneiss) and 485 ± 4 Ma (muscovite-biotite orthogneiss). The abundance of inherited pre-magmatic zircon cores (∼614–578 Ma) most likely documents detrital protoliths derived from erosion of the Ediacaran volcanic arc.

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Acknowledgments

This work was supported by the Strategic Research Plan of the Czech Geological Survey (DKRVO/ČGS 2018-2022), research project No. 321180 to DB and financial funds to the Moravian Museum by the Ministry of Culture of the Czech Republic as part of its long-term conceptual development program for research institutions (ref. MK000094862) to SH. The research has been partly supported by the institutional research fund of the Faculty of Science, Masaryk University, to ZL. They are also grateful to A. Zavřelova (ČGS) for zircon separation and for their help with diagrams.

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  1. Czech Geological Survey, Klárov 3, 118 21, Prague 1, Czech Republic

    David Buriánek & Jitka Míková

  2. Department of Geological Sciences, Faculty of Science, Masaryk University, Kotlářská 2, 611 37, Brno, Czech Republic

    David Buriánek, Lenka Buřivalová & Zdeněk Losos

  3. Department of Mineralogy and Petrography, Moravian Museum, Zelný trh 6, 659 37, Brno, Czech Republic

    Stanislav Houzar

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  1. David Buriánek
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Correspondence to Lenka Buřivalová.

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Buriánek, D., Buřivalová, L., Houzar, S. et al. Geochronology and petrogenesis of orthogneisses from the Pacov body: implications for the subdivision of the Cambro-Ordovician peraluminous magmatism and related mineralizations in the Monotonous and Varied units of the Moldanubian Zone (Bohemian Massif). Miner Petrol 114, 175–197 (2020). https://doi.org/10.1007/s00710-020-00699-8

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