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

Dörr, Wolfgang; Zulauf, Gernold

doi:10.1007/s00531-008-0389-x

Cited by 85 publications

(64 citation statements)

References 149 publications

(204 reference statements)

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“…In spite of the chemical contrasts between intrusions within the CBPC (see Holub et al 1997b;Janoušek et al , 2000b, the age span of main-phase plutons is relatively restricted within c. 15-20 My, between 354 ± 4 and 337 ± 1 Ma. Individual published ages are as follows (all errors are 2σ): (i) calc-alkaline rocks of the Sázava suite, 354 ± 4 Ma (Janoušek et al 2004) and 346 ± 10 Ma (Holub et al 1997a); (ii) high-K calc-alkaline rocks, Blatná and Kozárovice granodiorites, 347 ± 2 Ma and 346 ± 2 Ma, , Klatovy granodiorite, 347 +4 / -3 Ma (Dörr and Zulauf 2010); Nýrsko granite, 339 ± 2 Ma (Dörr and Zulauf 2010). The youngest ages within the CBPC were obtained for (iii) potassic to ultrapotassic rocks, Čertovo břemeno durbachite (343 ± 6 Ma;Holub et al 1997a) and Tábor quartz syenite (337 ± 1 Ma;Janoušek and Gerdes 2003).…”

Section: Geochronologymentioning

confidence: 99%

Padrť Stock (Teplá-Barrandian Unit, Bohemian Massif): petrology, geochemistry, U-Pb zircon dating of granodiorite, and Re-Os age and origin of related molybdenite mineralization

Žák¹,

Svojtka²,

Breiter³

et al. 2014

Jour. Geosci.

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The Padrť Stock is a small (~5 km 2 ) intrusion located near the SE margin of the Teplá-Barrandian Unit, Bohemian Massif, several kilometers away from the NW periphery of the Central Bohemian Plutonic Complex. On outcrops, which are all located close to the contact of the stock with Neoproterozoic sedimentary rocks, two types of granitoids were detected, fine-to medium-grained hornblende-biotite Padrť granodiorite, and, along its SW margin, fine-to medium-grained partly porphyritic biotite Teslíny leucogranite. The U-Pb zircon dating of the more voluminous Padrť granodiorite by laser ablation ICP-MS yielded a magmatic age of 342.8 ± 1.1 Ma, which is slightly lower than are the published age data for the nearby Blatná suite granitoids of the Central Bohemian Plutonic Complex. The Re-Os dating of molybdenite occurring in quartz veins within a quartzite lens in close exocontact yielded ages of 337.2 ± 2.4 Ma and 339.8 ± 2.5 Ma (two samples). The data indicate that the formation of molybdenite postdated that of the magmatic rock. This is in agreement with relatively low-temperature deposition of quartz related to formation of the molybdenite, as indicated by the fluid inclusions (280 to 300 °C). characterized with respect to petrology, geochemistry and ages of individual intrusions (e.g., Janoušek et al. 1995;Holub et al. 1995Holub et al. , 1997aJanoušek et al. 2000aJanoušek et al. , 2000bJanoušek et al. , 2004Janoušek et al. , 2010Žák J et al. 2005a, b, 2009. The ages of the main-phase plutons within the CBPC range from 354 ± 4 Ma to 337 ± 1 Ma. Deeper within the TBU and another 25 km to the W, small early-Variscan Štěnovice Pluton (~27 km 2 , granodiorite-tonalite) occurs, for which zircon U-Pb dating yielded an age of 375 ± 2 Ma (Žák J et al. 2010). KeywordsThe Padrť Stock is little known due to its location inside the Brdy Military Training Area with restricted access (1927-recent) and because it is largely concealed beneath Quaternary cover. Rather controversial views regarding the petrology and extent of the Padrť Stock were presented in the geological maps and short papers (e.g., Fediuk 2008). The purpose of this study is not only to bring new petrological and geochemical insights, but also provide U-Pb age for the Padrť Stock. The research focused also on sub-economic molybdenite mineralization in quartz veins within a thermally-metamorphosed quartzite at its exocontact. Lastly, in order to improve the

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Section: Geochronologymentioning

confidence: 99%

Padrť Stock (Teplá-Barrandian Unit, Bohemian Massif): petrology, geochemistry, U-Pb zircon dating of granodiorite, and Re-Os age and origin of related molybdenite mineralization

Žák¹,

Svojtka²,

Breiter³

et al. 2014

Jour. Geosci.

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“…Relatively younger plutons are also present along the Western Bohemian Shear Zone: the Bor granite (331 ± 1 Ma) on the north, the Mutȇnin gabbro/diorite (341 ± 1 Ma) and the Drahotin gabbronorite (328 ± 1 Ma) in the middle part and the Babylon granite (342 + 10/−6 Ma) on the south (Dörr and Zulauf 2010) (Fig. 11).…”

Section: Thermal History Of the Central Sudetes Shear Zonesmentioning

confidence: 99%

“…The western part of the Central Bohemian Shear Zone was intruded by the Klatovy Pluton composed of the Klatovy granodiorite (347 + 4/−3 Ma), the Kozlovice granodiorite (346 ± 6 Ma), the Okrajovy granite and the Nyrsko granite (339 ± 2 Ma) (Dörr and Zulauf 2010).…”

Section: Thermal History Of the Central Sudetes Shear Zonesmentioning

confidence: 99%

“…The eastern part of the Central Bohemian Shear Zone is dominated by the large Central Bohemian Pluton, consisting of several individual intrusions differing in age and composition, and reflecting a magmatic sequence from older calc-alkaline to younger ultrapotassic melts: the Požáry trondhjemite (351 ± 11 Ma), the Sázava calc-alkaline tonalite/granodiorite with quartz dioritic to gabbroid rocks (354 ± 4 Ma), the Blatna calc-alkaline granodiorite (346 ± 10 Ma), the Čertovo Břemeno durbachites (343 ± 6 Ma) and the Tabor Pluton quartz syenites, to melagranites (337 ± 1.0 Ma) (Dörr and Zulauf 2010 and references therein; Fig. 11).…”

Section: Thermal History Of the Central Sudetes Shear Zonesmentioning

confidence: 99%

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Variscan granitoids related to shear zones and faults: examples from the Central Sudetes (Bohemian Massif) and the Middle Odra Fault Zone

Oberc-Dziedzic

Kryza

2015

Int J Earth Sci (Geol Rundsch)

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and are accompanied by an increase in the local thermal gradient, as documented by the crystallization of cordierite, andalusite and sillimanite; (5) the increase in the thermal gradient precedes the emplacement of granitoids and their concomitant thermal influence on the country rocks. The granitoids related to the final stages of tectonothermal activity of the shear zones are good-time markers of their evolutionary path. Keywords Granitoid intrusions · Shear zones · Variscan magmatism · The Sudetes IntroductionMagma emplacement along faults and shear zones, and spatial relationships between these structures and granite plutons have been widely discussed (e.g. Paterson and Schmidt 1999;Schmidt and Paterson 2000;Richards 2001;Weinberg et al. 2004Weinberg et al. , 2006Paterson 2006; Archanjo et al. 2008). The discussion has focused on the question whether, and to what extent, magma migration is controlled by faults and shear zones, and on the problem of statistical evaluations of spatial and geometric relationships between populations of igneous bodies and structures in various crustal settings (Paterson and Schmidt 1999). Relatively less attention has been paid to the petrology and internal structural features of the fault-related and shear zone-related granitoids. These problems have recently been investigated in the Central Sudetes (CS) granitoid intrusions (NE part of the Bohemian Massif) and in the Middle Odra Fault Zone (MOFZ; the Wrocław granitoids), which are both spatially and temporally related to large-scale faults and shear zones (including postulated terrane boundaries; Fig. 1). AbstractThe granitoid intrusions of the Central Sudetes (CS) and of the Middle Odra Fault Zone (MOFZ), NE part of the Bohemian Massif, are both spatially and temporally related to large-scale shear zones and faults (including possible terrane boundaries) that provided effective channels for melt migration. Summarizing common features of the CS and MOFZ granitoids, we have delineated a set of characteristics of the fault-related and shear zone-related granitoids: (1) they are mainly generated by partial melting of crustal sources, with variable contribution (or no contribution) of mantle materials; (2) the sheet-like, steeply inclined, narrow and rather small granitoid intrusions are emplaced within shear zones at mid-crustal level (c. 20 km depth), whereas the larger, flat-lying plutons intrude into the upper crust, outside or above these shear zones; (3) the magmatic foliation and lineation in granitoids of the deeper, sheet-like intrusions are concordant with those in the surrounding metamorphic rocks, suggesting that the solidification of granitoids was coeval with the deformation in the shear zones; instead, the magmatic foliation in the shallower and larger dome-like plutons reflects magma flow; (4) ductile, transcurrent movements along the shear zones postdate medium-pressure regional metamorphism This study provides a synthesis of the published data on the petrology, geochemistry and age of the Central Sudetes and Wro...

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“…Currently, the Central European Variscides is one of the most important areas for the investigation of orogenic processes (e.g. Schulmann et al 2005Schulmann et al , 2009Dörr and Zulauf 2010;Hajná et al 2011;Žák et al 2014). In particular, exceptional lithologies, such as skarns, are contributing to the reconstruction of the pre-Variscan and earlyVariscan evolution as high-grade metamorphic overprint obliterated the records of orogenic processes in many metasedimentary rocks.…”

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confidence: 99%

Geochronology and petrology of pyroxene-garnet skarns (eastern Bohemian Massif): implications for the source and evolution of the Variscan continental crust

Pertoldová¹,

Kosulicova²,

Verner³

et al. 2014

J. Geosci.

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Zircon ages (U-Pb, LA-ICP-MS) obtained from skarns in the Kutná Hora and Svratka units and in the Moldanubian Zone (Bohemian Massif) show significant variations between the lithotectonic units as well as among samples from individual localities. The ages fall between 310 Ma and 3.1 Ga. We suggest that such large spread is a result of both different zircon clastic grain sources and subsequent metamorphic histories. The oldest Neoarchaean to Neoproterozoic ages are interpreted as detrital zircon grains from pre-Cadomian basement. Pronounced age maxima between 600 and 520 Ma (late Neoproterozoic to early Cambrian) were found in skarn samples from the Moldanubian Zone, Svratka and Kutná Hora units. We interpret these as maximum ages of skarn precursor deposition. Apparent Cambrian-OrdovicianSilurian to early Devonian zircon ages were obtained from non-mineralized samples of the Moldanubian Zone and also in the Kutná Hora Unit. This wide temporal interval could reflect maximum ages of skarn precursors related to disintegration of abundant early Palaeozoic magmatic rocks, provided the zircons were not modified by later metamorphism or fluid circulation. The early Carboniferous ages are interpreted to result from strong Variscan HT metamorphism and subsequent circulation of post-metamorphic fluids. Zircons of this age are dominant in skarns with massive magnetite mineralization, while the non-mineralized samples preserve the older ages.

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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

Cited by 85 publications

References 149 publications

Padrť Stock (Teplá-Barrandian Unit, Bohemian Massif): petrology, geochemistry, U-Pb zircon dating of granodiorite, and Re-Os age and origin of related molybdenite mineralization

Padrť Stock (Teplá-Barrandian Unit, Bohemian Massif): petrology, geochemistry, U-Pb zircon dating of granodiorite, and Re-Os age and origin of related molybdenite mineralization

Variscan granitoids related to shear zones and faults: examples from the Central Sudetes (Bohemian Massif) and the Middle Odra Fault Zone

Geochronology and petrology of pyroxene-garnet skarns (eastern Bohemian Massif): implications for the source and evolution of the Variscan continental crust

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