Evolution of nappes in the eastern margin of the Bohemian Massif: a kinematic interpretation

Schulmann, Karel; Ledru, Patrick; Autran, Albert; Melka, Radek; Lardeaux, Jean‐Marc; Urban, Miroslav; Lobkowicz, Michal

doi:10.1007/bf01828768

Cited by 91 publications

(53 citation statements)

References 13 publications

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“…In northwestern Spain, large-scale nappes and their ramps and horses involved all lithospheric levels, from the upper mantle to the upper crust, thus redistributing the former lateral orogenic zonation. Comparable observations come from the mid-European Variscides (Matte et al, 1990;Schulmann et al, 1991;Mingram, 1998;Stipska et al, 1998). It is evident that a pre-Variscan orogenic zonation has been involved in the Variscan collisional events (e.g., Martinez Catalán et al, 1997;Arenas et al, 2000), and relics of oceanic domains appear as fragments within large divergent orogenic belts (Pin, 1990;Matte, 1991;Martinez Catalan et al, 1999).…”

Section: Variscan Complications-discussionmentioning

confidence: 93%

Paleozoic evolution of pre-Variscan terranes: From Gondwana to the Variscan collision

Stampfii¹,

Raumer²,

Borel³

2002

Variscan-Appalachian Dynamics: The Building of the Late Paleozoic Basement

196

135

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Section: Variscan Complications-discussionmentioning

confidence: 93%

Paleozoic evolution of pre-Variscan terranes: From Gondwana to the Variscan collision

Stampfii¹,

Raumer²,

Borel³

2002

Variscan-Appalachian Dynamics: The Building of the Late Paleozoic Basement

196

135

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“…Intense faulting and thrusting of the entire Moravo-Silesian Paleozoic sequence (Rajlich 1990;Schulmann 1990;Schulmann et al 1991) took place with Precambrian basement rocks being incorporated in the thrust sheets. To the southeast (Carpathian foredeep) and northwest, epi-Variscan cover sequences overlie these rocks.…”

Section: General Geologymentioning

confidence: 99%

Plumbotectonic aspects of polymetallic vein mineralization in Paleozoic sediments and Proterozoic basement of Moravia (Czech Republic)

Slobodník

Jacher-Sliwczynska

Taylor

et al. 2007

Int J Earth Sci (Geol Rundsch)

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A regional isotopic study of Pb and S in hydrothermal galenas and U-Pb and S in potential source rocks was carried out for part of Moravia, Czech Republic. Two major generations of veins, (syn-) Variscan and post-Variscan, are defined based on the Pb-isotope system together with structural constraints (local structures and regional trends). The Pb-isotopic compositions of galena plot in two distinct populations with outliers in 206 Pb/ 204 Pb-207 Pb/ 204 Pb space. Galena from veins hosted in greywackes provides a cluster with the lowest Pb-Pb ratios: 206 Pb/ 204 Pb = 18.15-18.27, 207 Pb/ 204 Pb = 15.59-15.61, 208 Pb/ 204 Pb = 38.11-38.23. Those hosted in both limestones and greywackes provide the second cluster: 206 Pb/ 204 Pb = 18.37-18.44, 207 Pb/ 204 Pb = 15.60-15.63, 208 Pb/ 204 Pb = 38.14-38.32. These clusters suggest model Pb ages as Early Carboniferous and Triassic-Jurassic, the latter associated with MVT-like deposits. Two samples from veins hosted in Proterozoic rocks lie outside the two clusters: in metagranitoid ( 206 Pb/ 204 Pb = 18.55, 207 Pb/ 204 Pb = 15.64, 208 Pb/ 204 Pb = 38.29) and in orthogneiss ( 206 Pb/ 204 Pb = 18.79, 207 Pb/ 204 Pb = 15.73, 208 Pb/ 204 Pb = 38.54).The results from these two samples suggest an interaction of mineralizing fluids with the radiogenic Pb-rich source (basement?). The values of d 34 S suggest the Paleozoic host rocks (mostly -6.7 to +5.2& CDT) as the source of S for hydrothermal sulfides (mostly -4.8 to +2.5& CDT). U-Pb data and Pb isotope evolutionary curves indicate that Late Devonian and Early Carboniferous sediments, especially siliciclastics, are the general dominant contributor of Pb for galena mineralization developed in sedimentary rocks. Plumbotectonic mixing occurred, it is deduced, only between the lower and the upper crust (the latter involving Proterozoic basement containing heterogeneous radiogenic Pb), without any significant input from the mantle. It is concluded that in the Moravo-Silesian and Rhenohercynian zones (including proximal districts in Poland) lead and sulfur have been mobilized from the adjacent rocks during multiple hydrothermal events in processes that are remarkably comparable in timing, geochemistry of fluids and nature of sources.

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“…This ∼300 km long, 30 to 50 km wide belt consists of three NE-SW-elongated tectonic windows emerging through structurally overlying high-grade rocks of the Moldanubian-Lugian domain: southern Thaya Window; central Svratka Window and northern Silesian domain (Schulmann et al 2008). The Moravo-Silesian Zone developed during Carboniferous dextral-oblique thrusting of the Moldanubian-Lugian domain (Schulmann et al 1991).…”

Section: Geological Settingmentioning

confidence: 99%

Magnesian tourmalines from plagioclase-muscovite-scapolite metaevaporite layers in dolomite marble near Prosetín (Olešnice Unit, Moravicum, Czech Republic)

Bačík¹,

Uher²,

Cempírek

et al. 2012

Jour. Geosci.

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Radial aggregates of blue-grey tourmaline were found in plagioclase-muscovite-scapolite metaevaporite layers in dolomite marble near Prosetín (Olešnice Unit, Moravicum, Czech Republic). It occurs in association with plagioclase (An 15-37 ), muscovite, scapolite, phlogopite, vermiculite, pumpellyite-(Al), and clinozoisite. Electron-microprobe analyses of tourmaline show dravitic composition with very high content of Mg (1.92 to 2.77 apfu), Al (up to 6.71 apfu), low content of Fe (up to 0.39 apfu) and variable amounts of vacancies (0.09 to 0.47) and Ca (0.03 to 0.29 apfu) in the X-site. Some analyses correspond to "oxy-dravite" and some others almost attain magnesio-foitite compositions. The proportion of X-site vacancy decreases from the crystal cores to their rims while Ca content increases. Generally, charge excess due to the high Al-contents is balanced either by an increasing X-site vacancy or by deprotonization of W OH; the W O 2-content calculated from charge-balanced formula attains 0.71 apfu. Lattice parameters [a = 15.9116(6) Å; c = 7.1987(4) Å] and deduced average bond lengths ( = 1.995 Å; = 1.929 Å) indicate a relatively high Al-Mg disorder. Three main substitution mechanisms are inferred to operate in the studied magnesian tourmalines: (1) CaMg(NaAl) -1 , mainly in Ca-enriched dravite, (2) X □Al(NaMg) -1 in nearly magnesio-foititic compositions, and (3) AlO(MgOH) -1 in "oxydravitic" members. The tourmaline is relatively poor in trace elements; only Ti, Sr, and Ga exceed 100 ppm according to LA-ICP-MS study. There is a pronounced positive correlation between Sr and Ca (r 2 = 0.77), which suggests that Sr accumulated in Ca-enriched zones of dravite. The pale blue-grey color of the studied tourmalines is most likely a result of Fe 2+ crystal field transitions along with the absence of significant amounts of other chromophores. Trace-element contents, mineral assemblage and compositional zoning of tourmalines as well as host-rock mineral association suggest prograde metamorphic growth and support metaevaporitic origin of the plagioclase-muscovite-scapolite rocks.

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Evolution of nappes in the eastern margin of the Bohemian Massif: a kinematic interpretation

Cited by 91 publications

References 13 publications

Paleozoic evolution of pre-Variscan terranes: From Gondwana to the Variscan collision

Paleozoic evolution of pre-Variscan terranes: From Gondwana to the Variscan collision

Plumbotectonic aspects of polymetallic vein mineralization in Paleozoic sediments and Proterozoic basement of Moravia (Czech Republic)

Magnesian tourmalines from plagioclase-muscovite-scapolite metaevaporite layers in dolomite marble near Prosetín (Olešnice Unit, Moravicum, Czech Republic)

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