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Tectonic evolution of a continental magmatic arc from transpression in the upper crust to exhumation of mid-crustal orogenic root recorded by episodically emplaced plutons: the Central Bohemian Plutonic Complex (Bohemian Massif)

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Abstract

The Central Bohemian Plutonic Complex (CBPC) consists of episodically emplaced plutons, the internal fabrics of which recorded tectonic evolution of a continental magmatic arc. The ~354–350 Ma calc-alkaline plutons were emplaced by multiple processes into the upper-crustal Teplá-Barrandian Unit, and their magmatic fabrics recorded increments of regional transpression. Multiple fabrics of the younger, ~346 Ma Blatná pluton recorded both regional transpression and the onset of exhumation of mid-crustal orogenic root (Moldanubian Unit). Continuous exhumation-related deformation during pluton cooling resulted in the development of a wide zone of sub-solidus deformation along the SE margin of the CBPC. Finally, syn-exhumation tabular durbachitic pluton of ultrapotassic composition was emplaced atop the intrusive sequence at ~343–340 Ma, and the ultrapotassic Tábor pluton intruded after exhumation of the orogenic root (~337 Ma). We suggest that the emplacement of plutons during regional transpression in the upper crust produced thermally softened domain which then accommodated the exhumation of the mid-crustal orogenic root, and that the complex nature of the Teplá-Barrandian/Moldanubian boundary is a result of regional transpression in the upper crust, the enhancement of regional deformation in overlapping structural aureoles, the subsequent exhumation of the orogenic root domain, and post-emplacement brittle faulting.

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Acknowledgements

Thorough reviews by Gérard Gleizes and one anonymous reviewer significantly helped to improve the manuscript and are gratefully acknowledged. We thank the Charles University Grant Agency (GAUK) and the Czech National Grant Agency (GAČR) for financial support. Financial support by the Grant No.230/2001/B-GEO/PrF of the Charles University Grant Agency (to K. Schulmann) and in part also by the Grant No. 205/02/0514 of the Czech National Grant Agency (to F. V. Holub) are gratefully acknowledged.

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Authors and Affiliations

  1. Institute of Geology and Paleontology, Charles University, Prague, Czech Republic

    Jiří Žák

  2. Institute of Petrology and Structural Geology, Charles University, Prague, Czech Republic

    František V. Holub & Kryštof Verner

  3. Czech Geological Survey, Prague, Czech Republic

    Jiří Žák & Kryštof Verner

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  1. Jiří Žák
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  2. František V. Holub
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  3. Kryštof Verner
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Correspondence to Jiří Žák.

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Žák, J., Holub, F.V. & Verner, K. Tectonic evolution of a continental magmatic arc from transpression in the upper crust to exhumation of mid-crustal orogenic root recorded by episodically emplaced plutons: the Central Bohemian Plutonic Complex (Bohemian Massif). Int J Earth Sci (Geol Rundsch) 94, 385–400 (2005). https://doi.org/10.1007/s00531-005-0482-3

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