Single zircon ages and whole-rock Nd isotopic systematics of early Palaeozoic granitoid gneisses from the Czech and Polish Sudetes (Jizerské hory, Krkonoše Mountains and Orlice-Sněžník Complex)

Kröner, Alfred; Jaeckel, P.; Hegner, E.; Opletal, M.

doi:10.1007/s005310000139

Cited by 118 publications

(128 citation statements)

References 34 publications

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“…The term is used here as defined by Fiala et al (1995), except of the Svratka and the Kutná Hora units -below we present evidence indicating that the latter two units evolved as separate entities; (2) the Teplá-Barrandian Zone as the upper-crustal segment including unmetamorphosed to medium-grade Neoproterozoic and Lower Palaeozoic volcanosedimentary sequences (e.g. Chaloupský et al 1995;Zulauf 1997;Drost et al 2004); (3) the Saxothuringian Zone and Western Sudetes as Neoproterozoic to Lower Palaeozoic rock complexes with tectonically implanted slices of Variscan HP and UHP rocks (Kröner et al 2001;Mazur et al 2005). The units nowadays located at the eastern margin of the Bohemian Massif were thrust over pre-Variscan basement, deformed Late Neoproterozoic granitoids and a tectonically imbricated metasedimentary sequence of Devonian age of the Moravo-Silesian Zone (Schulmann and Gayer 2000).…”

Section: Geological Settingmentioning

confidence: 69%

“…Grt-Cpx, Cpx-Grt, garnetite, Cpx skarn, Grt-Hbl, Gru-Cpx processes during Cambrian magmatic event 530-515 Ma ago (U-Pb on zircon) (Kröner et al 2001;Štípská et al 2004;Schulmann et al 2005). The rock-forming minerals of the studied rocks were affected by Variscan deformation and metamorphic recrystallization under ~MP−MT conditions at ~350−330 Ma (Buriánek et al 2009b).…”

Section: Svratka Unitmentioning

confidence: 99%

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Comparison of lithology and tectonometamorphic evolution of units at the northern margin of the Moldanubian Zone: implications for geodynamic evolution in the northeastern part of the Bohemian Massif

Pertoldová¹,

Verner²,

Vrána³

et al. 2012

J. Geosci.

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Multidisciplinary research evaluates structural, metamorphic and petrochemical data of selected rock types in different units located in the northeastern part of the Bohemian Massif, Czech Republic: (1) the Strážek Unit in the northeastern part of the Moldanubian Zone, (2) the Svratka and Kutná Hora units correlated with the Orlice-Sněžník Unit in Western Sudetes as well as (3) the Polička, Hlinsko and Zábřeh units belonging to the Teplá-Barrandian Zone. Petrochemical data for metasediments of the Polička, Hlinsko and Zábřeh units are mutually comparable and confirm a lithological affinity to the upper-crustal Teplá-Barrandian Zone. The FeO t /MnO ratios in metasediments of the Strážek Unit and the Svratka Unit indicate differences in the origin of sedimentary protolith rocks. Relict pre-Variscan structures, including extensive migmatization, and high-grade mineral assemblages with peak metamorphic pressures of ~1.4 GPa in skarn bodies, are preserved in the Svratka Unit. The evidence for Palaeo-Variscan (390-355 Ma) HP and UHP events, recorded in the high-grade Kutná Hora and Orlice-Sněžník units, was observed neither in the NE part of the Moldanubian Zone (Strážek Unit) nor the Teplá-Barrandian Zone (Polička and Zábřeh units). The Variscan orogenic event imprinted in the Svratka, Polička and Zábřeh units was the right-lateral slip along WNW-ESE trending shear zones. This deformation was accompanied by metamorphism at ~580-650 °C and ~0.5-0.7 GPa (352-343 Ma) and intrusion of numerous small bodies of syn-deformation calc-alkaline granitoids in the Polička and Zábřeh units. The younger metamorphic fabrics in the northeastern part of the Moldanubian Zone reflect a fast exhumation of deep-seated high-grade complexes at ~340 Ma, which was constrained by post-tectonic emplacement of durbachites at ~339 Ma. Metamorphic development in felsic granulites of the Strážek Unit, metamorphosed c. 340 Ma ago at 850 °C and 1.8 GPa, was followed by decompression to T ≅ 790 °C and P = 1.3 GPa and finally T = 700 °C and P = ~0.4 GPa. In contrast, Běst-vina granulite in the Kutná Hora Unit, with the ~360 Ma high-grade metamorphism at 800-920 °C and 1.8-2.1 GPa, is free of such a HT-LP overprint. Thus the data indicate that the Svratka and Kutná Hora units, exhibiting numerous mutual differences, should not be considered as belonging to the Moldanubian Zone as they evolved as independent entities. The geochemical data on garnet-clinopyroxene skarns from the Moldanubian Zone, the Svratka and Kutná Hora units do not provide mutually distinguishing features. This is largely due to a very wide compositional variation in rocks interpreted as metamorphosed exhalite with detrital material admixture. Skarns from the Svratka Unit preserve clinopyroxenes with elevated jadeite component (0.5-24 mol. %) and prograde compositional zoning in garnet -features obliterated in samples from the Moldanubian Zone and the Kutná Hora Unit.

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Section: Geological Settingmentioning

confidence: 69%

Section: Svratka Unitmentioning

confidence: 99%

Comparison of lithology and tectonometamorphic evolution of units at the northern margin of the Moldanubian Zone: implications for geodynamic evolution in the northeastern part of the Bohemian Massif

Pertoldová¹,

Verner²,

Vrána³

et al. 2012

J. Geosci.

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“…The Izera gran ites were emplaced by Early Pa leo zoic (Cam brian to Or do vi cian) magmatism. The gran ites, grano diorites and gneisses from the east ern part of the Izera Mas sif have been dated using sev eral dif fer ent meth ods and span a gen eral age range of 550-460 Ma (Borkowska et al, 1980;Jarmołowicz-Szulc, 1984;Korytowski et al, 1993;Kröner et al, 2001).…”

Section: Geological Settingmentioning

confidence: 99%

222Rn and 220Rn concentrations in soil gas of the Izera Massif (Sudetes, Poland) as a function of sampling depth

Malczewski

Żaba

2017

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. 222 Rn and 220 Rn con cen tra tions in soil gas of the Izera Mas sif (Sudetes, Po land) as a func tion of sam pling depth. Geo log i cal Quar terly, 61 (4): 877-886, doi: 10.7306/gq.1377 This re search pres ents soil gas 222 Rn and 220 Rn con cen tra tions mea sured at 17 lo ca tions in the Izera Mas sif of south west Po land. The av er age 222 Rn con cen tra tions at sam pling depths of 10, 40 and 80 cm were 8, 78 and 224 kBq m -3 , re spec tively. The av er age 220 Rn con cen tra tions for the same depths (10, 40 and 80 cm) were 6, 10 and 13 kBq m -3 , re spec tively. Pro files of the con cen tra tions ver sus depth can be fit ted by ex po nen tial, lin ear and poly no mial func tions for soils de vel oped on fault zones, above ura nium min eral de pos its, and above faulted ura nium de pos its, re spec tively. Soils de vel oped on bed rock without fault zones or ura nium min er ali sa tion ex hibit con cen tra tions that fol low a power func tion with an ex po nent of p <1.

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“…The Cambro-Ordovician protolith age of the orthogneisses was a subject of several papers (e.g. Kröner et al 2000Kröner et al , 2001 for review), while the controversial protolith ages for eclogites were recently discussed by Bröcker et al (2010).…”

Section: Variscan Deformation and Metamorphismmentioning

confidence: 99%

Variscan thermal overprints exemplified by U-Th-Pb monazite and K-Ar muscovite and biotite dating at the eastern margin of the Bohemian Massif (East Sudetes, Czech Republic)

Schulmann¹,

Oliot²,

Kosulicova³

et al. 2014

Jour. Geosci.

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Potassium-argon method on muscovite and biotite and chemical U-Th-Pb method on monazite have been used to date various tectonic and thermal processes affecting the Silesian orogenic wedge at the eastern Variscan front (NE Bohemian Massif). This wedge is composed of three structural units showing an increasing Barrovian metamorphic gradient from the east to the west and LP-HT reworking related to voluminous granite intrusion of the Žulová Pluton in the central part. Three groups of ages are reported: 1) Mississippian (340-320 Ma) K-Ar muscovite ages from the western kyanite zone and easternmost biotite-chlorite zone, ~320 Ma U-Th-Pb ages of monazite inclusions in syn-burial S 1 fabric preserved in garnets of the kyanite zone, 2) Pennsylvanian-Early Permian (~310-290 Ma) K-Ar ages on muscovite and biotite and matrix monazite from the sillimanite and staurolite zones of the central part of the wedge, 3) Early to Mid-Permian K-Ar muscovite and biotite and U-Th-Pb matrix monazite ages (~280-260 Ma) from the southern part of the area, adjacent to the Sudetic fault system. The sequence of obtained ages is interpreted as reflecting the Mississippian formation of the Silesian orogenic wedge that was followed by crustal-scale detachment related to Pennsylvanian-Early Permian intrusion of a voluminous Žulová Pluton accompanied by important fluid flow. Finally, the southern part of the studied domain was probably reworked by Permian fault system associated with renewed fluid activity.

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Single zircon ages and whole-rock Nd isotopic systematics of early Palaeozoic granitoid gneisses from the Czech and Polish Sudetes (Jizerské hory, Krkonoše Mountains and Orlice-Sněžník Complex)

Cited by 118 publications

References 34 publications

Comparison of lithology and tectonometamorphic evolution of units at the northern margin of the Moldanubian Zone: implications for geodynamic evolution in the northeastern part of the Bohemian Massif

Comparison of lithology and tectonometamorphic evolution of units at the northern margin of the Moldanubian Zone: implications for geodynamic evolution in the northeastern part of the Bohemian Massif

222Rn and 220Rn concentrations in soil gas of the Izera Massif (Sudetes, Poland) as a function of sampling depth

Variscan thermal overprints exemplified by U-Th-Pb monazite and K-Ar muscovite and biotite dating at the eastern margin of the Bohemian Massif (East Sudetes, Czech Republic)

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