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Statements

Subject Item
n2:RIV%2F00025798%3A_____%2F03%3A00001016%21RIV07-GA0-00025798
rdf:type
skos:Concept n17:Vysledek
dcterms:description
The felsic granulites with the Variscan (~340 Ma) HP?HT assemblage Grt+Qtz+hypersolvus Fsp+-Ky, correspond geochemically to slightly peraluminous, fractionated granitic rocks. U, Th and Cs are strongly depleted, probably because of the fluid and/or slight melt loss during the HP metamorphism (900?1050 C, 1?5?2?0 GPa). However, the rest of the trace-element contents and variation trends can be explained by fractional crystallisation of a granitic magma. Low Zr and LREE contents yield ~750 C Zrc and Mnz saturation temperatures and suggest relatively low-T crystallisation. The granulites contain radiogenic Sr (Sri=0?7106?0?7706) and unradiogenic Nd (EpsNdi=-4?2 to -7?5), indicating derivation from an old crustal source. The bulk of felsic granulites do not appear to represent separated, syn-metamorphic Variscan HP?HT melts. Instead, they are interpreted as metamorphosed (partly anatectic) equivalents of older, probably high-level granites subducted to continental roots during the Variscan collision. The felsic granulites with the Variscan (~340 Ma) HP?HT assemblage Grt+Qtz+hypersolvus Fsp+-Ky, correspond geochemically to slightly peraluminous, fractionated granitic rocks. U, Th and Cs are strongly depleted, probably because of the fluid and/or slight melt loss during the HP metamorphism (900?1050 C, 1?5?2?0 GPa). However, the rest of the trace-element contents and variation trends can be explained by fractional crystallisation of a granitic magma. Low Zr and LREE contents yield ~750 C Zrc and Mnz saturation temperatures and suggest relatively low-T crystallisation. The granulites contain radiogenic Sr (Sri=0?7106?0?7706) and unradiogenic Nd (EpsNdi=-4?2 to -7?5), indicating derivation from an old crustal source. The bulk of felsic granulites do not appear to represent separated, syn-metamorphic Variscan HP?HT melts. Instead, they are interpreted as metamorphosed (partly anatectic) equivalents of older, probably high-level granites subducted to continental roots during the Variscan collision. Variské felzické granulity Gföhlské jednotky moldanubika geochemicky odpovídají mírně peraluminickým, frakcionovaným granitům. Kromě silného ochuzení U, Th a Cs, což lze připsat na vrub ztrátě fluid při vysokotlaké metamorfóze, lze zastoupení většiny stopových prvků vysvětlit frakcionací granitového magmatu. Nízký obsah Zr a LREE ukazuje na saturační teploty zirkonu a monazitu kolem 750 C. Radiogenní Sr a neradiogenní Nd ukazuje na vznik ze starého korového zdroje. Celý komplex je interpretován jako metamorfované starší variské granity.
dcterms:title
Whole-rock geochemistry of felsic granulites from the Gföhl Unit (Moldanubian Zone, Austria and Czech Republic): petrogenetic implications Whole-rock geochemistry of felsic granulites from the Gföhl Unit (Moldanubian Zone, Austria and Czech Republic): petrogenetic implications Horninová geochemie a geneze granulitů Gföhlské jednotky (Moldanubikum Českého masivu, Rakousko a Česká republika)
skos:prefLabel
Horninová geochemie a geneze granulitů Gföhlské jednotky (Moldanubikum Českého masivu, Rakousko a Česká republika) Whole-rock geochemistry of felsic granulites from the Gföhl Unit (Moldanubian Zone, Austria and Czech Republic): petrogenetic implications Whole-rock geochemistry of felsic granulites from the Gföhl Unit (Moldanubian Zone, Austria and Czech Republic): petrogenetic implications
skos:notation
RIV/00025798:_____/03:00001016!RIV07-GA0-00025798
n3:strany
174-176
n3:aktivita
n12:P
n3:aktivity
P(GA205/03/0040)
n3:cisloPeriodika
podzim
n3:dodaniDat
n11:2007
n3:domaciTvurceVysledku
n14:7243111
n3:druhVysledku
n9:J
n3:duvernostUdaju
n6:S
n3:entitaPredkladatele
n13:predkladatel
n3:idSjednocenehoVysledku
635527
n3:idVysledku
RIV/00025798:_____/03:00001016
n3:jazykVysledku
n15:eng
n3:klicovaSlova
Austria, Czech Republic, high-grade metamorphism, Nd isotopes, partial melting, Sr isotopes, Variscan orogeny
n3:klicoveSlovo
n4:partial%20melting n4:Sr%20isotopes n4:high-grade%20metamorphism n4:Czech%20Republic n4:Austria n4:Variscan%20orogeny n4:Nd%20isotopes
n3:kodStatuVydavatele
AT - Rakouská republika
n3:kontrolniKodProRIV
[0E08D60477B1]
n3:nazevZdroje
Mitteilungen der Österreichischen Mineralogischen Gesellschaft
n3:obor
n5:DD
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
2
n3:projekt
n16:GA205%2F03%2F0040
n3:rokUplatneniVysledku
n11:2003
n3:svazekPeriodika
148
n3:tvurceVysledku
Janoušek, Vojtěch Finger, Fritz
s:issn
1680-8959
s:numberOfPages
3