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“Granite tectonics” revisited: insights from comparison of K-feldspar shape-fabric, anisotropy of magnetic susceptibility (AMS), and brittle fractures in the Jizera granite, Bohemian Massif

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Abstract

In the Jizera granite of the Krkonoše–Jizera Plutonic Complex, northern Bohemian Massif, contrasting patterns of magmatic K-feldspar fabrics and brittle fractures characterize different structural levels of the pluton. The uppermost exposed level at ∼800–1,100 m above sea level is dominated by flat foliation that overprints two steep foliations. In contrast, K-feldspar shape-fabric in an underground tunnel (∼660 m above sea level) shows complex variations in orientation and intensity. Magnetic fabric carried by coaxial contributions of biotite, magnetite, and maghemite is homogeneous along the examined section of the tunnel, and is decoupled from the K-feldspar fabric. The Jizera granite is crosscut by two regional sets of subvertical fractures (∼NE–SW and ∼NW–SE) and by near-surface exfoliation joints. The multiple fabrics are inferred to reflect a complex magmatic strain history at different structural levels of the pluton, bearing little or no relationship to the fracture network. In contrast to the original concept of Hans Cloos (“granite tectonics”), we conclude that no simple genetic relationship exists between fabrics and fractures in plutons. An alternative classification of fractures in plutons thus should avoid relationships to magmatic fabrics and should instead consist of cooling, syntectonic, uplift, and post-uplift fractures.

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Acknowledgments

We would like to thank Dov Bahat and Robert Miller for their very constructive reviews that helped us to improve the original manuscript. František Hrouda is gratefully acknowledged for discussions and help with the interpretation and measuring AMS in the laboratories of AGICO Ltd, Brno, Czech Republic. Vladimír Bělohradský is thanked for field assistance and help with underground mapping in the tunnels. Severočeské vodárny a kanalizace, Ltd are acknowledged for allowing us to access and work in the water-plant tunnels. The research was supported by the Radioactive Waste Repository Authority of the Czech Republic (SÚRAO) project “Geological and structural characterization of granitoids in the Bedřichov tunnel in the Jizera Mountains” (to Josef Klomínský), by the Czech Geological Survey Internal Research Project No. 3238 “Relationship between magmatic fabrics and fracture networks in plutons” (to Jiří Žák), and by the Ministry of Education, Youth and Sports of the Czech Republic Research Plan No. MSM0021620855.

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

    Jiří Žák

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

    Jiří Žák, Kryštof Verner & Josef Klomínský

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

    Kryštof Verner

  4. Boháčova 866, Prague, 14900, Czech Republic

    Marta Chlupáčová

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Žák, J., Verner, K., Klomínský, J. et al. “Granite tectonics” revisited: insights from comparison of K-feldspar shape-fabric, anisotropy of magnetic susceptibility (AMS), and brittle fractures in the Jizera granite, Bohemian Massif. Int J Earth Sci (Geol Rundsch) 98, 949–967 (2009). https://doi.org/10.1007/s00531-007-0292-x

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