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  • Felsické granulity s variskou (~340 Ma) HP-HT paragenezí Grt+Qtz+hypersolvní Fsp+-Ky, geochemicky odpovídají slabě peralumickým, frakcionovaným granitickým horninám. U, Th a Cs jsou silně ochuzené, pravděpodobně díky ztrátě fluid a/nebo malé proporce taveniny během HP metamorfózy (900-1050 C, 1,5-2,0 GPa). Avšak zbylé obsahy a variační trendy stopových prvků mohou bý vysvětleny frakční krystalizací granitického magmatu. Nízké obsahy Zr a LREE odpovídají saturačním teplotám Zrc a Mnz~750 C a svědčí o relativně nízké T krystalizace. Granulity obsahují radiogenní Sr (Sri=0,7106-0,7706) a neradiogenní Nd (EpsNdi=-4,2 to -7,5), odpovídající vzniku ze zdroje s dlouhou krustální historií. Většina felsických granulitů zřejmě nejsou separované, synmetamorfní variské HP-HT taveniny. Naopak, jsou interpretovány jako metamorfované (částečně anatektické) ekvivalenty starších granitů, subdukovaných během variské kolize. (cs)
  • 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. (en)
Title
  • Deciphering petrogenesis of deeply buried granites: whole-rock geochemical constraints on the origin of largely undepleted felsic granulites from the Moldanubian Zone of the Bohemian Massif
  • Dešifrování petrogeneze hluboko pohřbených granitů: výzkum horninové geochemie převážně neochuzených felsických granulitů moldanubické zóny Českého masívu (cs)
  • Deciphering petrogenesis of deeply buried granites: whole-rock geochemical constraints on the origin of largely undepleted felsic granulites from the Moldanubian Zone of the Bohemian Massif (en)
skos:prefLabel
  • Deciphering petrogenesis of deeply buried granites: whole-rock geochemical constraints on the origin of largely undepleted felsic granulites from the Moldanubian Zone of the Bohemian Massif
  • Dešifrování petrogeneze hluboko pohřbených granitů: výzkum horninové geochemie převážně neochuzených felsických granulitů moldanubické zóny Českého masívu (cs)
  • Deciphering petrogenesis of deeply buried granites: whole-rock geochemical constraints on the origin of largely undepleted felsic granulites from the Moldanubian Zone of the Bohemian Massif (en)
skos:notation
  • RIV/00025798:_____/04:00000211!RIV/2005/GA0/N03005/N
http://linked.open.../vavai/riv/strany
  • 141-160
http://linked.open...avai/riv/aktivita
http://linked.open...avai/riv/aktivity
  • P(GA205/03/0040)
http://linked.open...iv/cisloPeriodika
  • 02/01/05
http://linked.open...vai/riv/dodaniDat
http://linked.open...aciTvurceVysledku
http://linked.open.../riv/druhVysledku
http://linked.open...iv/duvernostUdaju
http://linked.open...titaPredkladatele
http://linked.open...dnocenehoVysledku
  • 559508
http://linked.open...ai/riv/idVysledku
  • RIV/00025798:_____/04:00000211
http://linked.open...riv/jazykVysledku
http://linked.open.../riv/klicovaSlova
  • Austria;Czech Republic;high-grade metamorphism;Nd isotopes;partial melting;Sr isotopes;Variscan orogeny (en)
http://linked.open.../riv/klicoveSlovo
http://linked.open...odStatuVydavatele
  • GB - Spojené království Velké Británie a Severního Irska
http://linked.open...ontrolniKodProRIV
  • [F036FBCD6D00]
http://linked.open...i/riv/nazevZdroje
  • Transactions of the Royal Society of Edinburgh: Earth Sciences
http://linked.open...in/vavai/riv/obor
http://linked.open...ichTvurcuVysledku
http://linked.open...cetTvurcuVysledku
http://linked.open...vavai/riv/projekt
http://linked.open...UplatneniVysledku
http://linked.open...v/svazekPeriodika
  • 95
http://linked.open...iv/tvurceVysledku
  • Frýda, Jiří
  • Janoušek, Vojtěch
issn
  • 0263-5933
number of pages
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