Exhumation, strain localization, and emplacement of granitoids along the western part of the Central Bohemian shear zone (Bohemian Massif)

Scheuvens, Dirk; Zulauf, Gernold

doi:10.1007/s005310000108

Cited by 38 publications

(29 citation statements)

References 38 publications

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“…The real value is probably far above 15 km (see discussion in Zulauf et al 2002a). Similar throw magnitudes have been suggested for the NBSZ (Zulauf et al 2002b), for the HBSZ (Bues et al 2002), and for the CBSZ (Scheuvens and Zulauf 2000). Geobarometric data obtained by Scheuvens (1999) indicate that the southern parts of the Klatovy granodiorite intruded at much deeper levels (11-18 km depth) than the northern parts (4-9 km depth).…”

Section: Constraints On the Attitude And Throw Of The Bszsupporting

confidence: 59%

“…1). The latter have been used to subdivide the BSZ into (1) the ENE trending North Bohemian shear zone (NBSZ, Zulauf et al 2002b), (2) the NNW trending West Bohemian shear zone (WBSZ, Zulauf 1994;Zulauf et al 2002a), (3) the Hoher Bogen shear zone (HBSZ, Bues and Zulauf 2000;Bues et al 2002), and (4) the ENE trending Central Bohemian shear zone (CBSZ, Scheuvens and Zulauf 2000). All of these shear zones are characterized by a high dip angle ([70°), extensional TBU-down movements (Fig.…”

Section: The Bohemian Shear Zonementioning

confidence: 99%

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Elevator tectonics and orogenic collapse of a Tibetan-style plateau in the European Variscides: the role of the Bohemian shear zone

Dörr

Zulauf

2008

Int J Earth Sci (Geol Rundsch)

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Variscan collision of peri-Gondwanan terranes led to a doubly vergent crustal wedge that was thicker than 55 km in the area of the Bohemian Massif. This crustal thickness resulted in a highly elevated Bohemian plateau with a topographic height[3-4 km. The Bohemian plateau was covered with unmetamorphic Paleozoic strata, all of which are today well preserved in the Tepla-Barrandian unit because of crustal-scale vertical slip along the Bohemian shear zone (BSZ). The BSZ forms a subvertical, ca. 500-km long and up to 2-km wide belt of dip-slip mylonites which show several 90°deflections in map view. Tepla-Barrandian-down movements were active under retrograde metamorphic conditions, starting with granulite and ceasing with greenschist facies conditions. As slip along the BSZ was largely vertical and led to a minimum throw of 10 km, this type of crustal-scale deformation is referred to as elevator tectonics. The elevator-style movements caused the juxtaposition of the supracrustal TeplaBarrandian lid (the ''elevator'') against high-grade rocks of the extruding orogenic root. The BSZ has further governed the foci of mantle-derived plutonism. New U-Pb zircon and monazite TIMS dating of six plutons suggest that emplacement of mantle-derived melts along the BSZ lasted for at least 20 m.y., starting with the emplacement of the Klatovy granodiorite at 347 ?4/-3 Ma and ceasing with the emplacement of the Drahotin pluton at 328 ± 1 Ma. When taking into account the new ages of synkinematic plutons, the simultaneous vertical slip along the individual segments of the BSZ (North, West, and Central Bohemian shear zone) is bracketed to the period 343-337 Ma. Elevator tectonics was probably controlled by delamination of thickened mantle lithosphere that caused a dramatic thermal turnover and heating-up of the orogenic root. The overheated lower crust was thermally softened by anatexis and diffusion creep resulting in channel flow, vertical extrusion, fast uplift, and exhumation of the orogenic root.

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Section: Constraints On the Attitude And Throw Of The Bszsupporting

confidence: 59%

Section: The Bohemian Shear Zonementioning

confidence: 99%

Elevator tectonics and orogenic collapse of a Tibetan-style plateau in the European Variscides: the role of the Bohemian shear zone

Dörr

Zulauf

2008

Int J Earth Sci (Geol Rundsch)

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“…However, Scheuvens and Zulauf (2000) pointed out major differences in Al-in-hornblende barometric estimations from the Klatovy granodiorite within the narrow (1-3 km) Klatovy apophysis or pluton separating the Barrandian and Moldanubian rocks at the SW apex of the CBPC.…”

Section: Geological Settingmentioning

confidence: 96%

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)

Žák

Holub

Verner

2005

Int J Earth Sci (Geol Rundsch)

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“…a mylonite belt, several km wide, which dips steeply towards the Tepla Barrandian unit; 2. dip-slip or oblique-slip normal movements, meaning that the Tepla Barrandian unit moved down with respect to the Moldanubian unit; 3. retrograde metamorphism during shearing ranging from high-grade amphibolite to lower greenschist facies (Vejnar 1977c, Zulauf 1994Bues et al 1998;Bues and Zulauf 2000;Scheuvens 1999;Scheuvens and Zulauf 2000).…”

Section: Regional Geologymentioning

confidence: 98%

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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Exhumation, strain localization, and emplacement of granitoids along the western part of the Central Bohemian shear zone (Bohemian Massif)

Cited by 38 publications

References 38 publications

Elevator tectonics and orogenic collapse of a Tibetan-style plateau in the European Variscides: the role of the Bohemian shear zone

Elevator tectonics and orogenic collapse of a Tibetan-style plateau in the European Variscides: the role of the Bohemian shear zone

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)

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

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