Z. Vejnar's research while affiliated with The Czech Academy of Sciences and other places

Publications (23)

Article
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Clastic metasedimentary rocks from the Tepla Crystalline Complex (western Bohemian Massif) were analysed for major and trace elements, Sr and Nd isotopes. The metamorphic grade of these rocks of presumed Neoproterozoic protolith age increases from SE to NW from very low-grade to amphibolite-facies conditions. Geochemistry indicates that the sedimen...
Article
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The crystalline basement of the Cheb Tertiary Basin is comprised of muscovite granite of the Smrčiny Pluton and crystalline schists of the Saxothuringian Unit. With increasing depth (as seen from the 1190 m deep drill hole HV-18) this crystalline schist exhibits rapid metamorphic gradation, with the characteristic development of garnet, staurolite,...
Article
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The West Bohemian shear zone (WBSZ) forms a steep collapse structure along which east-side-down 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 Mut&#51nin pluton intruded into Moldanubian crust at a depth...
Article
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The Teplá – Barrandian unit (TBU) of the Bohemian Massif shared a common geological history throughout the Neoproterozoic and Cambrian with the Avalonian – Cadomian terranes. The Neoproterozoic evolution of an active plate margin in the Teplá – Barrandian is similar to Avalonian rocks in Newfoundland, whereas the Cambrian transtension and related c...
Article
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The igneous complex of Neukirchen–Kdyně is located in the southwestern part of the Teplá–Barrandian unit (TBU) in the Bohemian Massif. The TBU forms the most extensive surface exposure of Cadomian basement in central Europe. Cambrian plutons show significant changes in composition, emplacement depth, isotopic cooling ages, and tectonometamorphic ov...
Article
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Granitic metapegmatites of two crystalline units of the western Bohemian massif, the Zone of Erbendorf-Vohenstrauss in Germany (ZEV), and the Zone of Teplá-Domazlice in the Czech Republic (ZTD) have been dated by means of U-Pb and Rb-Sr methods. Ages interpreted to reflect emplacement and crystallisation of the pegmatites were found consistently to...
Article
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U–Pb zircon dating of three metagranitoids, situated within a tilted crustal section at the northwestern border of the Tepl Barrandian unit (Tepl crystalline complex, TCC), yields similar Cambrian ages. The U–Pb data of zircons of the Tepl orthogneiss define an upper intercept age of 513 +7/–6&#117Ma. The 207Pb/206Pb ages of 516ᆞ and 511&#4510&#117...
Article
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&#112The Cadomian basement of the Tepl–Barrandian unit is characterized by a classic Barrovian-type metamorphism, the degree of which increases considerably towards the west reaching amphibolite facies conditions in the Domaz&#156lice crystalline complex (DCC). The number and volume of plutons also increases towards the west. The emplacement ages o...
Chapter
The most detailed data referring to metamorphism in the Bohemicum comes from the Teplá-Barrandian (TB) region to the W and from the Orlické hory Mts. (Nové Město unit) to the NE. Knowledge of other outcroppings along its E and SE border, the Železné hory Hills, the Policka, Letovice, and Zábřeh regions, is unsystematic. Only boreholes and isolated...
Article
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K-Ar dating on hornblendes and micas from the Tepla Domazlice zone revealed a pattern of dates which significantly deviates from the mid-Carboniferous to early Permian one that is found in the adjacent low-pressure metamorphic Moldanubian and Saxothuringian. Especially for the Marianske Lazne metabasic complex, confirming early Czech determinations...
Article
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Various amphibolites, metagabbros and eclogitic relics of the Mariimske Lazne complex, and amphibolites from the Cerna Hora Massif exhibit an uniform geochemical character which compares well with modern mid-ocean ridge basalts. Geochemically these metabasites are similar to the amphibolites of the My to area and to schistose. partly striped amphib...

Citations

... (3) Kreuzer et al. (1989); (4) Kreuzer et al. (1990); (5) Kreuzer et al. (1992); (6) Gebauer (1993); (7) Dörr et al. (1996); (8) Dörr et al. (1997); (9) Zulauf et al. (1997); (10) Dallmeyer and Urban (1998); (11) Wemmer and Ahrendt (unpublished); (12) Dörr et al. (2002); (13) this study. HBSZ, NBSZ, WBSZ, CBSZ = Hoher -Bogen, North, West, Central Bohemian shear zone, respectively; AF = Andělice fault. ...
... Collisional closure of the basin is recorded in widespread medium- pressure metamorphism around 380 Ma ; in rocks on both sides of the suture and is also constrained by the onlap of early Famennian flysch greywackes on the foreland ( c . 375 Ma ; Schäfer et al . 1997 ) . ...
... The Zadní Chodov uranium deposit is located on the northwestern margin of the Bor pluton, which intruded into the West Bohemian shear zone (Zulauf, 1994) at the boundary between the Moldanubian and Teplá-Barrandian zones during the Variscan magmatic event (337 ± 6 Ma, U/Pb TIMS analyses on zircon; Dörr et al., 1997) (Fig. 1). The Zadní Chodov uranium deposit was mined from 1952 to 1992 and was ranked as a medium-size uranium deposit in the Bohemian Massif. ...
... During the late stages of Pan-African collisional events, the northern Western Gondwana margin records Late Ediacaran subduction along the Cadomian Orogen. The Cadomian Belt represented a retreating accretionary orogen recording widespread arc magmatism associated with a major flare-up event at ca. 580-520 Ma, back-arc basins and a main tectonometamorphic peak at ca. 550-540 Ma (Figs. 10, 11;Peucat 1986;Zulauf et al. 1999;Dörr et al. 2002;Linnemann et al. 2007Linnemann et al. , 2014Garfunkel 2015;von Raumer et al. 2015;Moghadam et al. 2017Moghadam et al. , 2019Dörr and Stein 2019;Oriolo et al. 2021). ...
... Recent geochronological data suggest that the individual belts within the Blovice accretionary complex are progressively younger to the northwest and that a large portion of the complex was accreted during early Cambrian until ~527 Ma (Žák et al., 2020). The upper age bracket for the accretionary processes is provided by granite to trondhjemite plutons that intrude the complex at ~524-522 Ma (Dörr et al., 2002;Dörr et al., 1998). ...
... From NW to SE, these rocks belong to the Saxothuringian Domain, including low-to medium-grade complexes of the Izera-Karkonosze Complex and the Orlica-Śnieżnik Dome and the Brunovistulian domain embodying the East Sudetes ( Fig. 1; e.g., Mazur et al. 2010Mazur et al. , 2012Mazur et al. , 2015Szczepański and Ilnicki 2014). However, rock successions that mantle the Orlica-Śnieżnik Dome on the west and south have been considered to represent fragments of the Teplá-Barrandian Domain (Cháb et al. 1995;Mazur et al. 2005). These comprise low-to medium-grade volcano-sedimentary successions in the Nové Město Unit in the west and the Zábřeh Unit in the south (Fig. 1). ...
... It is widely believed, though not proved, that Teplá-Barrandian rocks crop out in the Ž elezné hory hills and, also, in the Orlica Mountains of the Central Sudetes as the Nové Město and Zábřeh units ( Fig. 1; e.g. Mísař et al., 1983;Cháb et al., 1995). The Nové Město unit merges to the NE with the Orlica-Ś nieynik unit, proposed by Matte et al. (1990), Cymerman et al. (1997) and Aleksandrowski and Mazur (2002) to represent the northern extension of the Moldanubian terrane, the basis for this conclusion being close similarities in lithostratigraphy and timing of successive tectonometamorphic events (cf. ...
... This large inventory of modern, high-quality detrital zircon ages not only constrains the provenance, maximum depositional ages, and accretionary history of the complex, but also allows to derive some general inferences on the mechanisms of growth of accretionary wedges. Clast compositions together with trace element contents and Sr-Nd-Pb isotopic data consistently suggest that the sedimentary matrix, which forms the bulk of the Blovice accretionary wedge, was predominantly derived from a Neoproterozoic juvenile island arc with a rather minor contribution of mature, continental crustal source (e.g., Drost et al., 2004;Fiala et al., 2014;Hajná et al., 2011;Sláma et al., 2008). This is in agreement with the obtained zircon age spectra that reveal a significant source diversity (Figs. 9, 10). ...
... In both the ZEV and the western part of the Teplá-Barrandian, information about the absolute intrusion ages of pegmatites on the basis of reliable methods was not available. Only recently, an Early Ordovician age was suggested for pegmatites of the Domažlice crystalline complex based on Rb–Sr muscovite ages (Košler et al. 1994; Košler et al. 1997; Glodny et al. 1995a ). Similar results were obtained in the Teplá crystalline complex and in the ZEV (Glodny et al. 1995a). ...
... Furthermore, all phases defining the isochrons show satisfactory initial Sr-isotopic equilibrium. Accordingly, we consider resetting of the Rb-Sr isotope system during post-pegmatitic fluid influx episodes as unlikely, and rejuvenation by deformationinduced partial recrystallisation of pegmatitic phases (Glodny et al., 1998;Eberlei et al., 2015) can be ruled out. The ages also do not represent cooling ages, as protracted diffusion during cooling would inevitably result in higher apparent ages for larger mica grains (with their larger diffusion domain sizes) compared to smaller-sized mica crystals in a given sample (Glodny et al., 2008), which is not observed. ...