Polyphase tectonics and late Variscan extension in Austria (Moldanubian Zone, Strudengau area)

Zeitlhofer, Helga; Schneider, David; Grasemann, Bernhard; Petrakakis, Konstantin; Thöni, Martin

doi:10.1007/s00531-013-0952-y

Cited by 4 publications

(12 citation statements)

References 65 publications

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“…In summary, the Strudengau area records extensional tectonics within the Monotonous series and Gföhl unit at c. 320 Ma (Zeitlhofer et al 2013). NW-SE extension documented by NE-SW trending lamprophyric dyke systems has also been described by Neubauer et al (2003).…”

Section: Geological Settingmentioning

confidence: 80%

“…Gföhl unit rocks have fabrics characterized by a subvertical foliation and horizontal, N-S trending lineations. The whole suite exhibits granulite facies assemblages, HT decompression and an amphibolite facies overprint (Zeitlhofer et al 2013). In contrast, the Monotonous series consists of HT/LP migmatitic (metapelitic) gneisses and minor orthogneisses, characterized by an assemblage of Crd + Sil + Bt + Kfs.…”

Section: Geological Settingmentioning

confidence: 98%

“…The last ductile event (D 3 ) in the area occurred during regional extension and formed the subhorizontal Strudengau Shear Zone (SSZ), which records a top NW-directed displacement that evolved from greenschist facies ductile conditions to brittle conditions (Zeitlhofer et al 2013). The SSZ cross cuts preexisting structural elements and can be followed for at least 2 km along the railway outcrops parallel to the Danube River in the Viehtrift area (Fig.…”

Section: Geological Settingmentioning

confidence: 99%

“…In contrast, the Monotonous series consists of HT/LP migmatitic (metapelitic) gneisses and minor orthogneisses, characterized by an assemblage of Crd + Sil + Bt + Kfs. The fabric of these monotonous gneisses is dominated by moderately inclined E-dipping foliation planes and NW-SE trending lineations (Zeitlhofer et al 2013). The boundary between the Gföhl unit and the Monotonous series is marked by mylonitic gneisses enclosing numerous highly stretched ultramafic boudins (Zeitlhofer et al 2013).…”

Section: Geological Settingmentioning

confidence: 99%

“…The late-collisional Erzgebirge granites were emplaced at shallow crustal levels into the Variscan metamorphic basement shortly after large-scale extension caused by orogenic collapse (Förster et al 1999). Similarly, in the Strudengau area (SW Moldanubia, Austria), geochronology of a peraluminous dyke intruded in a NW-SE-oriented extensional regime indicates intrusion at 323 ± 5.7 (Sm-Nd), with a cooling age of 318 ± 1.1 (Ar-Ar on muscovite) (Zeitlhofer et al 2013). Neubauer et al (2003) distinguished two dyke generations within the Waldviertel dyke swarm (Lower Austria) that are associated with extension and indicated a maximum emplacement age of c. 325-320 Ma.…”

Section: Introductionmentioning

confidence: 96%

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Variscan potassic dyke magmatism of durbachitic affinity at the southern end of the Bohemian Massif (Lower Austria)

Zeitlhofer

Grasemann

Petrakakis

2015

Int J Earth Sci (Geol Rundsch)

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an Rb-Sr age of c. 318 Ma, interpreted as a deformation age during extensional tectonics. We propose a large-scale extensional regime at c. 320 Ma in the Strudengau area, accompanied by plutonism of fractionated magmas of syncollisional mantle-derived sources, mixed with crustal components. This geodynamic setting is comparable to other areas in the Variscan belt documenting an orogenic wide extension by the end of the Carboniferous.

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Section: Geological Settingmentioning

confidence: 80%

Section: Geological Settingmentioning

confidence: 98%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

See 3 more Smart Citations

Variscan potassic dyke magmatism of durbachitic affinity at the southern end of the Bohemian Massif (Lower Austria)

Zeitlhofer

Grasemann

Petrakakis

2015

Int J Earth Sci (Geol Rundsch)

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Emplacement of a lamprophyric sheet swarm under ductile transpression in continental crust. Insights from a Variscan magmatic complex in the West Armorican belt, Western France

Gall

Caroff

2023

Tectonophysics

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Polyphase deformation along the South Bohemian Batholith-Moldanubian nappes boundary – The Freyenstein Fault System (Bohemian Massif/Austria)

Griesmeier

Iglseder

Schuster

et al. 2020

Austrian Journal of Earth Sciences

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This work describes the Freyenstein Fault System, which extends over 45 km in the southeastern part of the Bohemian Massif (Lower Austria). It represents a ductile shear zone overprinted by a brittle fault located at the eastern edge of the South Bohemian Batholith towards the Moldanubian nappes. It affects Weinsberg- and a more “fine-grained” granite, interlayered aplitic granite and pegmatite dikes as well as paragneiss of the Ostrong Nappe System. The ductile shear zone is represented by approximately 500 m thick greenschist-facies mylonite dipping about 60° to the southeast. Shear-sense criteria like clast geometries, SCC`-type shear band fabrics as well as abundant microstructures show top to the south/ southsouthwest normal shearing with a dextral strike-slip component. Mineral assemblages in mylonitized granitoid consist of pre- to syntectonic muscovite- and biotite-porphyroclasts as well as dynamically recrystallized potassium feldspar, plagioclase and quartz. Dynamic recrystallization of potassium feldspar and the stability of biotite indicate upper green-schist-facies metamorphic conditions during the early phase of deformation. Fluid infiltration at lower greenschist-facies conditions led to local sericitization of feldspar and synmylonitic chloritisation of biotite during a later stage of ductile deformation. Finally, a brittle overprint by a north-south trending, subvertical, sinistral strike-slip fault that shows a normal component is observed. Ductile normal shearing along the Freyenstein Shear Zone is interpreted to have occurred between 320 Ma and c. 300 Ma. This time interval is indicated by literature data on the emplacement of the hostrock and cooling below c. 300°C inferred from two Rb-Sr biotite ages measured on undeformed granites close to the shear zone yielding 309.6 ± 3 Ma and 290.9 ± 2.9 Ma, respectively. Brittle sinistral strike-slip faulting at less than 300°C presumably took place not earlier than 300 Ma. Early ductile shearing along the Freyenstein Fault System may be genetically, but not kinematically linked to the Strudengau Shear Zone, as both acted in an extensional regime during late Variscan orogenic collapse. A relation to other major northeast-southwest trending faults of this part of the Bohemian Massif (e.g. the Vitis-Pribyslav Fault System) is indicated for the phase of brittle sinistral movement.

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Polyphase tectonics and late Variscan extension in Austria (Moldanubian Zone, Strudengau area)

Cited by 4 publications

References 65 publications

Variscan potassic dyke magmatism of durbachitic affinity at the southern end of the Bohemian Massif (Lower Austria)

Variscan potassic dyke magmatism of durbachitic affinity at the southern end of the Bohemian Massif (Lower Austria)

Emplacement of a lamprophyric sheet swarm under ductile transpression in continental crust. Insights from a Variscan magmatic complex in the West Armorican belt, Western France

Polyphase deformation along the South Bohemian Batholith-Moldanubian nappes boundary – The Freyenstein Fault System (Bohemian Massif/Austria)

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