About: Thermal and mechanical behaviour of the orogenic middle crust during the syn- to late-orogenic evolution of the Variscan root zone, Bohemian Massif

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About: Thermal and mechanical behaviour of the orogenic middle crust during the syn- to late-orogenic evolution of the Variscan root zone, Bohemian Massif Goto Sponge NotDistinct Permalink

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://onlinelibrary.wiley.com/doi/10.1111/jmg.12081/abstract
Description	The partly migmatitic Varied and Monotonous units, and the underlying Kaplice unit, show a continuity of structures that are also observed in the adjacent Blanský les HP granulite body. In both the Varied and Monotonous units, the S3 and S4 foliations are characterized by a Sil–Bt–Pl–Kfs–Qtz–Ilm±Grt assemblage, with occurrences of post-D4 andalusite, cordierite and muscovite. In the Monotonous unit, minute inclusions of garnet, kyanite, sillimanite and biotite are additionally found in plagioclase from a probable leucosome parallel to S3. The Kaplice unit shows rare staurolite and kyanite relicts, a Sil–Ms–Bt–Pl–Qtz±Grt assemblage associated with S3, retrogressed garnet−staurolite aggregates during the development of S4, and post-D4 andalusite, cordierite and secondary muscovite. Mineral equilibria modelling for representative samples indicates that the Varied unit records conditions higher than ~7 kbar at 725 °C during the transition from S3 to S4, followed by a P−T decrease from ~5.5 kbar/750 °C to ~4.5 kbar/700 °C. The Monotonous unit shows evidence of partial melting in the S3 fabric at P−T above ~8 kbar at 740–830 °C and a subsequent P−T decrease to 4.5–5 kbar/700 °C. The Kaplice unit preserves an initial medium-P prograde path associated with the development of S3 reaching peak P−T of ~6.5 kbar/640 °C. The subsequent retrograde path records 4.5 kbar/660 °C during the development of S4. The P−T conditions associated with S3 imply an overturned section of the orogenic middle crust. The shared structural evolution indicates that all mid-crustal units are involved in the large-scale folding cored by HP granulites. The retrograde P–T paths associated with S4 are interpreted as a result of a ductile thinning of the orogenic crust at a mid-crustal level. The 40Ar–39Ar ages overlap with U–Pb zircon ages in and around the HP granulite bodies, suggesting a short duration for the ductile thinning event. The partly migmatitic Varied and Monotonous units, and the underlying Kaplice unit, show a continuity of structures that are also observed in the adjacent Blanský les HP granulite body. In both the Varied and Monotonous units, the S3 and S4 foliations are characterized by a Sil–Bt–Pl–Kfs–Qtz–Ilm±Grt assemblage, with occurrences of post-D4 andalusite, cordierite and muscovite. In the Monotonous unit, minute inclusions of garnet, kyanite, sillimanite and biotite are additionally found in plagioclase from a probable leucosome parallel to S3. The Kaplice unit shows rare staurolite and kyanite relicts, a Sil–Ms–Bt–Pl–Qtz±Grt assemblage associated with S3, retrogressed garnet−staurolite aggregates during the development of S4, and post-D4 andalusite, cordierite and secondary muscovite. Mineral equilibria modelling for representative samples indicates that the Varied unit records conditions higher than ~7 kbar at 725 °C during the transition from S3 to S4, followed by a P−T decrease from ~5.5 kbar/750 °C to ~4.5 kbar/700 °C. The Monotonous unit shows evidence of partial melting in the S3 fabric at P−T above ~8 kbar at 740–830 °C and a subsequent P−T decrease to 4.5–5 kbar/700 °C. The Kaplice unit preserves an initial medium-P prograde path associated with the development of S3 reaching peak P−T of ~6.5 kbar/640 °C. The subsequent retrograde path records 4.5 kbar/660 °C during the development of S4. The P−T conditions associated with S3 imply an overturned section of the orogenic middle crust. The shared structural evolution indicates that all mid-crustal units are involved in the large-scale folding cored by HP granulites. The retrograde P–T paths associated with S4 are interpreted as a result of a ductile thinning of the orogenic crust at a mid-crustal level. The 40Ar–39Ar ages overlap with U–Pb zircon ages in and around the HP granulite bodies, suggesting a short duration for the ductile thinning event. (en)
Title	Thermal and mechanical behaviour of the orogenic middle crust during the syn- to late-orogenic evolution of the Variscan root zone, Bohemian Massif Thermal and mechanical behaviour of the orogenic middle crust during the syn- to late-orogenic evolution of the Variscan root zone, Bohemian Massif (en)
skos:prefLabel	Thermal and mechanical behaviour of the orogenic middle crust during the syn- to late-orogenic evolution of the Variscan root zone, Bohemian Massif Thermal and mechanical behaviour of the orogenic middle crust during the syn- to late-orogenic evolution of the Variscan root zone, Bohemian Massif (en)
skos:notation	RIV/00025798:_____/14:00000158!RIV15-GA0-00025798
http://linked.open...avai/riv/aktivita	P
http://linked.open...avai/riv/aktivity	P(GA13-16315S), P(LK11202)
http://linked.open...iv/cisloPeriodika	6
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Franěk, Jan Schulmann, Karel Štípská, Pavla
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Česká geologická služba
http://linked.open...dnocenehoVysledku	50294
http://linked.open...ai/riv/idVysledku	RIV/00025798:_____/14:00000158
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	burial and exhumation, mineral equilibria modelling, Moldanubian domain,P-T-t-d path, thermochronology (en)
http://linked.open.../riv/klicoveSlovo	P-T-t-d path mineral equilibria modelling Moldanubian domain burial and exhumation thermochronology
http://linked.open...odStatuVydavatele	GB - Spojené království Velké Británie a Severního Irska
http://linked.open...ontrolniKodProRIV	[FAA8AD63AE22]
http://linked.open...i/riv/nazevZdroje	Journal of Metamorphic Geology
http://linked.open...in/vavai/riv/obor	DB
http://linked.open...ichTvurcuVysledku	3 (xsd:int)
http://linked.open...cetTvurcuVysledku	6 (xsd:int)
http://linked.open...vavai/riv/projekt	The role of Paleozoic accretionary and collisanal orogens on the formation and growth of continental crust Prográdní metamorfóza, korové ztluštění a spodnokorový tok: nový koncept budování kořene variského orogenu
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	32
http://linked.open...iv/tvurceVysledku	Franěk, Jan Schulmann, Karel Štípská, Pavla Skrzypek, Etienne Petri, Benoit Corsini, Michel
http://linked.open...ain/vavai/riv/wos	000339277100004
issn	0263-4929
number of pages	27 (xsd:int)
http://bibframe.org/vocab/doi	10.1111/jmg.12081

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