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Description
| - A section of the orogenic middle crust (Orlica-Snieznik Dome) was examined to constrain the duration and significance of deformation (D) and intertectonic (I) phases. Three deformation events produced an initial subhorizontal foliation S1, a subvertical foliation S2 and a late subhorizontal cleavage S3 (D3). The synform was intruded by pre-, syn- and post-D2 granitoid sheets. The P–T path, obtained by modelling the stability of parageneses and garnet zoning, shows near-isobaric heating from ~4 kbar/485 °C to ~4.75 kbar/575 °C during I1–2. This was followed by a progression to 4–5 kbar/580–625 °C and a pressure decrease to 3–4 kbar during D2. Pressure decrease below 3 kbar is ascribed to I2–3, whereas cooling below ~500 °C occurred during D3. In the dated mica schist sample, garnet rims show strong Lu enrichment, oscillatory Lu zoning and a slight Ca increase, related to allanite breakdown coeval with staurolite appearance. As Lu-rich garnet rims dominate the Lu–Hf budget, the 344+/-3 Ma isochron age is ascribed to garnet crystallization at staurolite grade, near the end of I1–2. For the amphibole–biotite granitoid a Pb–Pb single zircon evaporation age of 353+/-1 Ma is related to the onsetof plutonic activity. The results suggest a possible Devonian age for D1, and a Carboniferous burial-exhumation cycle in mid-crustal rocks. A succession of telescoping stages with time spans decreasing from c. 10 to 2–3 Ma is proposed. The initially long period of tectonic quiescence (I1–2 phase, c. 10 Ma) inferred in the middle crust contrasts with contemporaneous deformation at deeper levels and points to decoupled P–T–D histories within the orogenic wedge. An elevated gradient of 30 °C/ km and assumed high heating rates of 20 °C/Ma are explained by the protracted intrusion of granitoid sheets, with or without deformation, whereas fast vertical movements (2–3 Ma, D2 phase) in the crust require the activity of deformation phases.
- A section of the orogenic middle crust (Orlica-Snieznik Dome) was examined to constrain the duration and significance of deformation (D) and intertectonic (I) phases. Three deformation events produced an initial subhorizontal foliation S1, a subvertical foliation S2 and a late subhorizontal cleavage S3 (D3). The synform was intruded by pre-, syn- and post-D2 granitoid sheets. The P–T path, obtained by modelling the stability of parageneses and garnet zoning, shows near-isobaric heating from ~4 kbar/485 °C to ~4.75 kbar/575 °C during I1–2. This was followed by a progression to 4–5 kbar/580–625 °C and a pressure decrease to 3–4 kbar during D2. Pressure decrease below 3 kbar is ascribed to I2–3, whereas cooling below ~500 °C occurred during D3. In the dated mica schist sample, garnet rims show strong Lu enrichment, oscillatory Lu zoning and a slight Ca increase, related to allanite breakdown coeval with staurolite appearance. As Lu-rich garnet rims dominate the Lu–Hf budget, the 344+/-3 Ma isochron age is ascribed to garnet crystallization at staurolite grade, near the end of I1–2. For the amphibole–biotite granitoid a Pb–Pb single zircon evaporation age of 353+/-1 Ma is related to the onsetof plutonic activity. The results suggest a possible Devonian age for D1, and a Carboniferous burial-exhumation cycle in mid-crustal rocks. A succession of telescoping stages with time spans decreasing from c. 10 to 2–3 Ma is proposed. The initially long period of tectonic quiescence (I1–2 phase, c. 10 Ma) inferred in the middle crust contrasts with contemporaneous deformation at deeper levels and points to decoupled P–T–D histories within the orogenic wedge. An elevated gradient of 30 °C/ km and assumed high heating rates of 20 °C/Ma are explained by the protracted intrusion of granitoid sheets, with or without deformation, whereas fast vertical movements (2–3 Ma, D2 phase) in the crust require the activity of deformation phases. (en)
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Title
| - Time-scale of deformation and intertectonic phases revealed by P–T–D–t relationships in the orogenic middle crust of the Orlica-Snieznik Dome, Polish/Czech Central Sudetes
- Time-scale of deformation and intertectonic phases revealed by P–T–D–t relationships in the orogenic middle crust of the Orlica-Snieznik Dome, Polish/Czech Central Sudetes (en)
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skos:prefLabel
| - Time-scale of deformation and intertectonic phases revealed by P–T–D–t relationships in the orogenic middle crust of the Orlica-Snieznik Dome, Polish/Czech Central Sudetes
- Time-scale of deformation and intertectonic phases revealed by P–T–D–t relationships in the orogenic middle crust of the Orlica-Snieznik Dome, Polish/Czech Central Sudetes (en)
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skos:notation
| - RIV/00025798:_____/14:00000080!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:_____/14:00000080
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http://linked.open...riv/jazykVysledku
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http://linked.open.../riv/klicovaSlova
| - garnet zoning, intertectonic phase, Lu–Hf dating, P–T–D–t path, Variscan Belt (en)
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http://linked.open.../riv/klicoveSlovo
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http://linked.open...odStatuVydavatele
| - GB - Spojené království Velké Británie a Severního Irska
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http://linked.open...ontrolniKodProRIV
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http://linked.open...i/riv/nazevZdroje
| - Journal of Metamorphic Geology
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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
| - Schulmann, Karel
- Štípská, Pavla
- Skrzypek, Etienne
- Lehmann, Jeremie
- Anczkiewicz, R.
- Bialek, D.
- Kroner, Alfred
- Szczepanski, J.
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http://linked.open...ain/vavai/riv/wos
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issn
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number of pages
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http://bibframe.org/vocab/doi
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