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rdf:type
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Description
| - The low-grade metavolcanic/volcanosedimentary complex of the Devonian Vrbno Group (Silesicum, NE Bohemian Massif, Czech Republic) occurs in two ~NE–SW trending belts, separated by tectonic slices of Cadomian metagranitic paraautochton. (1) The basic–intermediate lavas of the calc-alkaline Western Volcanic Belt came from a moderately depleted mantle. Rare rhyolites (374.0 ± 1.7 Ma: 2 sigma, LA–ICP–MS U–Pb Zrn) were derived most likely from immature crust or by extensive fractionation of primary basaltic melts. The rock association is interpreted as a vestige of a deeply dissected continental arc. (2) The Eastern Volcanic Belt consists mainly of (nearly) contemporaneous (371.0 ± 1.4 Ma) felsic alkaline lavas with high HFSE contents, as well as high Ga/Al and Fe/Mg ratios, typical of within-plate igneous setting. The petrology and Nd–Sr isotopic data point to a high-T anatexis of a young metagranitic crust, resembling the Cadomian (Brunovistulian) basement, in a back-arc setting. The attenuated Brunovistulian lithosphere could have partially melted by the heat provided by the upwelling asthenosphere and/or underplating basic magma. (3) Finally, the region was penetrated by numerous subalkaline, MORB/EMORB-like dolerite sheets — a hallmark of the considerable crustal thinning.
- The low-grade metavolcanic/volcanosedimentary complex of the Devonian Vrbno Group (Silesicum, NE Bohemian Massif, Czech Republic) occurs in two ~NE–SW trending belts, separated by tectonic slices of Cadomian metagranitic paraautochton. (1) The basic–intermediate lavas of the calc-alkaline Western Volcanic Belt came from a moderately depleted mantle. Rare rhyolites (374.0 ± 1.7 Ma: 2 sigma, LA–ICP–MS U–Pb Zrn) were derived most likely from immature crust or by extensive fractionation of primary basaltic melts. The rock association is interpreted as a vestige of a deeply dissected continental arc. (2) The Eastern Volcanic Belt consists mainly of (nearly) contemporaneous (371.0 ± 1.4 Ma) felsic alkaline lavas with high HFSE contents, as well as high Ga/Al and Fe/Mg ratios, typical of within-plate igneous setting. The petrology and Nd–Sr isotopic data point to a high-T anatexis of a young metagranitic crust, resembling the Cadomian (Brunovistulian) basement, in a back-arc setting. The attenuated Brunovistulian lithosphere could have partially melted by the heat provided by the upwelling asthenosphere and/or underplating basic magma. (3) Finally, the region was penetrated by numerous subalkaline, MORB/EMORB-like dolerite sheets — a hallmark of the considerable crustal thinning. (en)
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Title
| - Late Devonian subduction and back-arc extension at the western margin of Brunia: evidence from metavolcanic rocks of the Vrbno Group (Silesicum, north-eastern Bohemian Massif)
- Late Devonian subduction and back-arc extension at the western margin of Brunia: evidence from metavolcanic rocks of the Vrbno Group (Silesicum, north-eastern Bohemian Massif) (en)
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skos:prefLabel
| - Late Devonian subduction and back-arc extension at the western margin of Brunia: evidence from metavolcanic rocks of the Vrbno Group (Silesicum, north-eastern Bohemian Massif)
- Late Devonian subduction and back-arc extension at the western margin of Brunia: evidence from metavolcanic rocks of the Vrbno Group (Silesicum, north-eastern Bohemian Massif) (en)
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skos:notation
| - RIV/00025798:_____/14:00000220!RIV15-MSM-00025798
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http://linked.open...avai/riv/aktivita
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http://linked.open...avai/riv/aktivity
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http://linked.open...iv/cisloPeriodika
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http://linked.open...vai/riv/dodaniDat
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http://linked.open...aciTvurceVysledku
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http://linked.open.../riv/druhVysledku
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http://linked.open...iv/duvernostUdaju
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http://linked.open...titaPredkladatele
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http://linked.open...dnocenehoVysledku
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http://linked.open...ai/riv/idVysledku
| - RIV/00025798:_____/14:00000220
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http://linked.open...riv/jazykVysledku
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http://linked.open.../riv/klicovaSlova
| - Bohemian Massif, Devonian volcanic rocks, Geochemistry, U–Pb zircon dating, Sr–Nd–O isotopes, Variscan orogeny (en)
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http://linked.open.../riv/klicoveSlovo
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http://linked.open...odStatuVydavatele
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http://linked.open...ontrolniKodProRIV
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http://linked.open...i/riv/nazevZdroje
| - Mineralogia. Special Papers
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http://linked.open...in/vavai/riv/obor
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http://linked.open...ichTvurcuVysledku
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http://linked.open...cetTvurcuVysledku
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http://linked.open...vavai/riv/projekt
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http://linked.open...UplatneniVysledku
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http://linked.open...v/svazekPeriodika
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http://linked.open...iv/tvurceVysledku
| - Erban, Vojtěch
- Janoušek, Vojtěch
- Schulmann, Karel
- Žáček, Vladimír
- Mixa, Petr
- Pecina, Vratislav
- Hanžl, Pavel
- Hrdličková, Kristýna
- Gerdes, Axel
- Aichler, Jaroslav
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issn
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number of pages
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