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Magmatic history and geophysical signature of a post-collisional intrusive center emplaced near a crustal-scale shear zone: the Plechý granite pluton (Moldanubian batholith, Bohemian Massif)

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Abstract

The Plechý pluton, southwestern Bohemian Massif, represents a late-Variscan, complexly zoned intrusive center emplaced near the crustal-scale Pfahl shear zone; the pluton thus provides an opportunity to examine the interplay among successive emplacement of large magma batches, magmatic fabric acquisition, and the late-Variscan stress field associated with strike-slip shearing. The magmatic history of the pluton started with the emplacement of the porphyritic Plechý and Haidmühler granites. Based on gravity and structural data, we interpret that the Plechý and Haidmühler granites were emplaced as a deeply rooted, ∼NE–SW elongated body; its gross shape and internal fabric (steep ∼NE–SW magmatic foliation) may have been controlled by the late-Variscan stress field. The steep magmatic foliation changes into flat-lying foliation (particularly recorded by AMS) presumably as a result of divergent flow. Magnetic lineations correspond to a sub-horizontal ∼NE–SW finite stretch associated with the divergent flow. Subsequently, the Třístoličník granite, characterized by steep margin-parallel magmatic foliation, was emplaced as a crescent-shaped body in the central part of the pluton. The otherwise inward-younging intrusive sequence was completed by the emplacement of the outermost and the most evolved garnet-bearing granite (the Marginal granite) along the southeastern margin of the pluton.

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Acknowledgments

We would like to gratefully acknowledge the contribution of Teresa Román-Berdiel and Wolfgang Siebel through their very constructive and detailed reviews, which greatly assisted in improving the original manuscript. Associate Editor Marlina Elburg is acknowledged for her helpful comments and careful editorial handling of the manuscript. John Bartley, Michael Petronis, Jean Luis Vigneresse, Stanislav Vrána, and Zdeněk Pertold are thanked for their valuable comments on various versions of the manuscript. Marta Chlupáčová and František Hrouda (AGICO Ltd., Brno, Czech Republic) are thanked for discussions and for assistance with measuring AMS in the Laboratory of Rock Magnetism, AGICO Ltd., Brno, Czech Republic. We also wish to thank František Holub for discussions and for his assistance in the interpretation of the geochemical data from the Plechý pluton. The management of the Šumava National Park is thanked for collaboration, constant support, and interest in our work. This research was funded by the Czech Geological Survey and Ministry of Environment Research Project No. 6201 (to J. Babůrek) and in part by the Ministry of Education, Youth and Sports of the Czech Republic Research Plan No. MSM0021620855.

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Authors and Affiliations

  1. Czech Geological Survey, Klárov 3, Prague, 11821, Czech Republic

    Kryštof Verner, Jiří Žák & Jaroslava Pertoldová

  2. Institute of Petrology and Structural Geology, Faculty of Science, Charles University, Albertov 6, Prague, 12843, Czech Republic

    Kryštof Verner

  3. Institute of Geology and Paleontology, Faculty of Science, Charles University, Albertov 6, Prague, 12843, Czech Republic

    Jiří Žák & Jakub Trubač

  4. Czech Geological Survey, Ječná 29, Brno, 62100, Czech Republic

    Josef Šrámek

  5. Miligal Ltd, Axmanova 531, Brno, 62300, Czech Republic

    Jiří Sedlák

  6. Czech Geological Survey, Geologická 6, Prague, 15500, Czech Republic

    Patricie Týcová

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  1. Kryštof Verner
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Verner, K., Žák, J., Pertoldová, J. et al. Magmatic history and geophysical signature of a post-collisional intrusive center emplaced near a crustal-scale shear zone: the Plechý granite pluton (Moldanubian batholith, Bohemian Massif). Int J Earth Sci (Geol Rundsch) 98, 517–532 (2009). https://doi.org/10.1007/s00531-007-0285-9

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