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Statements

Subject Item
n2:RIV%2F00025798%3A_____%2F12%3A00000075%21RIV13-GA0-00025798
rdf:type
n14:Vysledek skos:Concept
rdfs:seeAlso
http://geolfrance.brgm.fr
dcterms:description
The felsic granulites of the Náměšť Granulite Massif represent a subducted Early Devonian continental crust, while the associated tholeiitic metabasites were probably generated during Cambro–Ordovician rifting. Based on these characteristics and contrasting P–T data we adopt a model of lower crustal relamination of low-density continental crust below autochthonous dense mafic root of the Moldanubian Continent. The difference in Zrn ages attributed to the HP metamorphic climax between the Náměšť granulite (~353 Ma) and other granulite massifs (~340 Ma; e.g., Wendt et al., 1994; Kröner et al., 2000; Friedl et al., 2011) is interpreted in terms of diachronous emplacement and different time scale of thermal maturation of western and eastern portions of the relaminated crust. Our work also shows that the mantle was refertilized before its incorporation into the crust, a feature typical of asthenospheric mantle below slow spreading rifts. Therefore, it is very likely that the Late Devonian history recorded in the mantle fragment (whose cooling was constrained by the Sm–Nd Grt–Px age of ~370 Ma: Medaris et al., 2006) reflects heterogeneous nature of the local subcontinental mantle lithosphere related to the Devonian rifting (most likely in back-arc of the Saxothuringian subduction), i.e. unrelated to the surrounding felsic granulites. The place of juxtaposition of the mantle fragment to the granulite is impossible to determine, but the likely Late Devonian age coincides well with the onset of the magmatic-arc related plutonic activity in the Teplá–Barrandian Unit (Štěnovice and Čistá plutons, as well as orthogneisses in the roof pendants of the Central Bohemian Plutonic Complex; Košler et al., 1993; Žák et al., 2011). The felsic granulites of the Náměšť Granulite Massif represent a subducted Early Devonian continental crust, while the associated tholeiitic metabasites were probably generated during Cambro–Ordovician rifting. Based on these characteristics and contrasting P–T data we adopt a model of lower crustal relamination of low-density continental crust below autochthonous dense mafic root of the Moldanubian Continent. The difference in Zrn ages attributed to the HP metamorphic climax between the Náměšť granulite (~353 Ma) and other granulite massifs (~340 Ma; e.g., Wendt et al., 1994; Kröner et al., 2000; Friedl et al., 2011) is interpreted in terms of diachronous emplacement and different time scale of thermal maturation of western and eastern portions of the relaminated crust. Our work also shows that the mantle was refertilized before its incorporation into the crust, a feature typical of asthenospheric mantle below slow spreading rifts. Therefore, it is very likely that the Late Devonian history recorded in the mantle fragment (whose cooling was constrained by the Sm–Nd Grt–Px age of ~370 Ma: Medaris et al., 2006) reflects heterogeneous nature of the local subcontinental mantle lithosphere related to the Devonian rifting (most likely in back-arc of the Saxothuringian subduction), i.e. unrelated to the surrounding felsic granulites. The place of juxtaposition of the mantle fragment to the granulite is impossible to determine, but the likely Late Devonian age coincides well with the onset of the magmatic-arc related plutonic activity in the Teplá–Barrandian Unit (Štěnovice and Čistá plutons, as well as orthogneisses in the roof pendants of the Central Bohemian Plutonic Complex; Košler et al., 1993; Žák et al., 2011).
dcterms:title
Geochemical and geochronological arguments for heterogeneous nature and complex development of Variscan lower continental crust: Náměšť Granulite Massif (Bohemian Massif, Czech Republic) Geochemical and geochronological arguments for heterogeneous nature and complex development of Variscan lower continental crust: Náměšť Granulite Massif (Bohemian Massif, Czech Republic)
skos:prefLabel
Geochemical and geochronological arguments for heterogeneous nature and complex development of Variscan lower continental crust: Náměšť Granulite Massif (Bohemian Massif, Czech Republic) Geochemical and geochronological arguments for heterogeneous nature and complex development of Variscan lower continental crust: Náměšť Granulite Massif (Bohemian Massif, Czech Republic)
skos:notation
RIV/00025798:_____/12:00000075!RIV13-GA0-00025798
n14:predkladatel
n15:ico%3A00025798
n3:aktivita
n13:P
n3:aktivity
P(GAP210/11/2358)
n3:dodaniDat
n19:2013
n3:domaciTvurceVysledku
n8:7243111
n3:druhVysledku
n16:D
n3:duvernostUdaju
n9:S
n3:entitaPredkladatele
n11:predkladatel
n3:idSjednocenehoVysledku
137999
n3:idVysledku
RIV/00025798:_____/12:00000075
n3:jazykVysledku
n18:eng
n3:klicovaSlova
granulites, Moldanubian Unit, Náměšť, geochemistry, age, SHRIMP, genesis
n3:klicoveSlovo
n4:granulites n4:N%C3%A1m%C4%9B%C5%A1%C5%A5 n4:Moldanubian%20Unit n4:age n4:SHRIMP n4:geochemistry n4:genesis
n3:kontrolniKodProRIV
[33E25A232B6D]
n3:mistoKonaniAkce
Sassari
n3:mistoVydani
Orléans
n3:nazevZdroje
Géologie de la France
n3:obor
n22:DD
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
6
n3:projekt
n21:GAP210%2F11%2F2358
n3:rokUplatneniVysledku
n19:2012
n3:tvurceVysledku
Janoušek, Vojtěch Fanning, Mark Schulmann, Karel Ulrich, Stanislav Kusbach, Vladimír Hasalová, Pavlína
n3:typAkce
n17:WRD
n3:zahajeniAkce
2012-01-01+01:00
s:numberOfPages
2
n6:hasPublisher
BRGM, SGF
n7:isbn
978-2-7159-2535-9