Intrusion within a transtensional tectonic domain: the Čistá granodiorite (Bohemian Massif)—structure and rheological modelling

Venera, Zdeněk; Schulmann, Karel; Kröner, Alfred

doi:10.1016/s0191-8141(00)00054-7

Cited by 41 publications

(30 citation statements)

References 22 publications

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“…Apart from the Č istá and Teufelsberg intrusions which yield Upper Devonian ages (Venera et al 2000;Bues et al, unpublished), Variscan granitoids of the TBU are restricted to the westernmost margin of the Teplá-Barrandian unit, where they are affected and cut by the WBSZ. The intrusion age of the Bor granite, located in the north (north of Běla and Radbuzou, Fig.…”

Section: Regional Geologymentioning

confidence: 96%

10 km Minimum throw along the West Bohemian shear zone: Evidence for dramatic crustal thickening and high topography in the Bohemian Massif (European Variscides)

Zulauf

Bues

Dörr³

et al. 2002

International Journal of Earth Sciences

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The West Bohemian shear zone (WBSZ) forms a steep collapse structure along which east-sidedown normal movements led to the juxtaposition of the relatively cold Cadomian basement of the Tepla-Barrandian unit against high grade Moldanubian rocks. Synkinematic plutons straddle the WBSZ. The Mutěnin pluton intruded into Moldanubian crust at a depth of 23±4 km as derived by using Al-in-hornblende barometry. The Tepla-Barrandian Babylon pluton intruded at <12 km depth as indicated by phengite barometry and petrogenetic considerations. Both emplacement depths, together with mineral cooling ages, result in a minimum vertical displacement of 10 km between 340 and 320 Ma. This large throw could be explained by overthickened crust that was weakened from below. The alkaline signature of the Mutěnin diorite indicates that mantle melting was important to thermally weaken the crust at 340 Ma. The cold Tepla-Barrandian upper crust sank into its weak, partly molten Moldanubian substratum, resulting in elevator-style movements, not only along the WBSZ, but also along the Hoher Bogen and Central Bohemian shear zone. All these ductile normal shear zones were active simultaneously during the Lower Carboniferous and dip steeply towards the Tepla-Barrandian unit that probably formed a highly elevated plateau at this time.

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Section: Regional Geologymentioning

confidence: 96%

10 km Minimum throw along the West Bohemian shear zone: Evidence for dramatic crustal thickening and high topography in the Bohemian Massif (European Variscides)

Zulauf

Bues

Dörr³

et al. 2002

International Journal of Earth Sciences

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“…2) are represented by low-grade metasediments in its western part and unmetamorphosed Proterozoic-Lower Palaeozoic sedimentary sequence in the east. The Proterozoic (meta-) sedimentary sequence is intruded by bodies of Cambrian and Devonian granites (Venera et al 2000;Dörr et al 2002;Žák et al in press). Core samples of the Proterozoic metasediments from the Barrandian Complex are represented by fine-grained chlorite-sericite phyllites with occasional presence of low-grade metabasites.…”

Section: The Barrandian Complexmentioning

confidence: 99%

Pre-Late Carboniferous geology along the contact of the Saxothuringian and Teplá-Barrandian zones in the area covered by younger sediments and volcanics (western Bohemian Massif, Czech Republic)

Mlčoch¹,

Konopásek²

2012

J. Geosci.

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The boundary between the Saxothuringian and the Teplá-Barrandian zones at the western margin of the Bohemian Massif represents an important tectonic suture of the Central European Variscides. However, most of this boundary is covered by Late Carboniferous and younger sedimentary and volcanic rocks, which prevent direct observation of particular geological units. We present a compilation of geological and depth measurement data from 12,134 exploration boreholes that reached the basement of the volcanic and sedimentary infill in the area of the Eger Graben in the north-western Bohemia, and correlate covered geological units with those exposed on the present-day surface. The resulting compilation reveals the relief of the sedimentary basins basement and interprets the real extent of the basement geological units in the western part of the Bohemian Massif. It also shows the position of the contact between units with the Saxothuringian and the Teplá-Barrandian affinities and suggests the boundary between rocks with Devonian metamorphic record and those metamorphosed during the Early Carboniferous period of the Variscan tectonometamorphic cycle.

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“…(2) The phyllites are intruded by the shallow-level mid-/ late Cambrian Tis granite dated at 504.8 ± 1.1 Ma (Pb-Pb single zircon evaporation method, Venera et al 2000;Fig. 2).…”

Section: Geologic Settingmentioning

confidence: 99%

Deciphering the Variscan tectonothermal overprint and deformation partitioning in the Cadomian basement of the Teplá–Barrandian unit, Bohemian Massif

Hajná

Žák

Kachlík

et al. 2012

Int J Earth Sci (Geol Rundsch)

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The Teplá-Barrandian unit (TBU) has long been considered as a simply bivergent supracrustal 'median massif' above the Saxothuringian subduction zone in the Variscan orogenic belt. This contribution reveals a much more complex style of the Variscan tectonometamorphic overprint and resulting architecture of the Neoproterozoic basement of the TBU. For the first time, we describe the crustal-scale NE-SW-trending dextral transpressional Krakovec shear zone (KSZ) that intersects the TBU and thrusts its higher grade northwestern portion severely reworked by Variscan deformation over a southeastern very low grade portion with well-preserved Cadomian structures and only brittle Variscan deformation. The age of movements along the KSZ is inferred as Late Devonian (*380-370 Ma). On the basis of structural, microstructural, and anisotropy of magnetic susceptibility data from the KSZ, we propose a new synthetic model for the deformation partitioning in the Teplá-Barrandian upper crust in response to the Late Devonian to early Carboniferous subduction and underthrusting of the Saxothuringan lithosphere. We conclude that the Saxothuringian/Teplá-Barrandian convergence was nearly frontal during *380-346 Ma and was partitioned into pure shear dominated domains that accommodated orogen-perpendicular shortening alternating with orogen-parallel high-strain domains that accommodated dextral transpression or bilateral extrusion. The synconvergent shortening of the TBU was terminated by a rapid gravity-driven collapse of the thickened lithosphere at *346-337 Ma followed by, or partly simultaneous with, dextral strike-slip along the Baltica margin-parallel zones, driven by the westward movement of Gondwana from approximately 345 Ma onwards.

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Intrusion within a transtensional tectonic domain: the Čistá granodiorite (Bohemian Massif)—structure and rheological modelling

Cited by 41 publications

References 22 publications

10 km Minimum throw along the West Bohemian shear zone: Evidence for dramatic crustal thickening and high topography in the Bohemian Massif (European Variscides)

10 km Minimum throw along the West Bohemian shear zone: Evidence for dramatic crustal thickening and high topography in the Bohemian Massif (European Variscides)

Pre-Late Carboniferous geology along the contact of the Saxothuringian and Teplá-Barrandian zones in the area covered by younger sediments and volcanics (western Bohemian Massif, Czech Republic)

Deciphering the Variscan tectonothermal overprint and deformation partitioning in the Cadomian basement of the Teplá–Barrandian unit, Bohemian Massif

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