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Statements

Subject Item
n2:RIV%2F00025798%3A_____%2F14%3A00000310%21RIV15-MSM-00025798
rdf:type
n13:Vysledek skos:Concept
rdfs:seeAlso
http://www.jgeosci.org
dcterms:description
Zircon ages (U–Pb, LA-ICPMS) obtained from skarns in the Kutná Hora and Svratka units and in the Moldanubian Zone (Bohemian Massif) show significant variations between the lithotectonic units as well as among samples from individual localities. The ages fall between 310 Ma and 3.1 Ga. We suggest that such large spread is a result of both different zircon clastic grain sources and subsequent metamorphic histories. The oldest Neoarchaean to Neoproterozoic ages are interpreted as detrital zircon grains from pre-Cadomian basement. Pronounced age maxima between 600 and 520 Ma (late Neoproterozoic to early Cambrian) were found in skarn samples from the Moldanubian Zone, Svratka and Kutná Hora units. We interpret these as maximum ages of skarn precursor deposition. Apparent Cambrian–Ordovician–Silurian to early Devonian zircon ages were obtained from non-mineralized samples of the Moldanubian Zone and also in the Kutná Hora Unit. This wide temporal interval could reflect maximum ages of skarn precursors related to disintegration of abundant early Palaeozoic magmatic rocks, provided the zircons were not modified by later metamorphism and fluid circulation. The early Carboniferous ages are interpreted to result from strong Variscan HT metamorphism and subsequent circulation of post-metamorphic fluids. Zircons of this age are dominant in skarns with massive magnetite mineralization, while the non-mineralized samples preserve the older ages. Zircon ages (U–Pb, LA-ICPMS) obtained from skarns in the Kutná Hora and Svratka units and in the Moldanubian Zone (Bohemian Massif) show significant variations between the lithotectonic units as well as among samples from individual localities. The ages fall between 310 Ma and 3.1 Ga. We suggest that such large spread is a result of both different zircon clastic grain sources and subsequent metamorphic histories. The oldest Neoarchaean to Neoproterozoic ages are interpreted as detrital zircon grains from pre-Cadomian basement. Pronounced age maxima between 600 and 520 Ma (late Neoproterozoic to early Cambrian) were found in skarn samples from the Moldanubian Zone, Svratka and Kutná Hora units. We interpret these as maximum ages of skarn precursor deposition. Apparent Cambrian–Ordovician–Silurian to early Devonian zircon ages were obtained from non-mineralized samples of the Moldanubian Zone and also in the Kutná Hora Unit. This wide temporal interval could reflect maximum ages of skarn precursors related to disintegration of abundant early Palaeozoic magmatic rocks, provided the zircons were not modified by later metamorphism and fluid circulation. The early Carboniferous ages are interpreted to result from strong Variscan HT metamorphism and subsequent circulation of post-metamorphic fluids. Zircons of this age are dominant in skarns with massive magnetite mineralization, while the non-mineralized samples preserve the older ages.
dcterms:title
Geochronology and petrology of pyroxen–garnet skatns (eastern Bohemian Massif): implications for the source and evolution of the Variscan continental crust Geochronology and petrology of pyroxen–garnet skatns (eastern Bohemian Massif): implications for the source and evolution of the Variscan continental crust
skos:prefLabel
Geochronology and petrology of pyroxen–garnet skatns (eastern Bohemian Massif): implications for the source and evolution of the Variscan continental crust Geochronology and petrology of pyroxen–garnet skatns (eastern Bohemian Massif): implications for the source and evolution of the Variscan continental crust
skos:notation
RIV/00025798:_____/14:00000310!RIV15-MSM-00025798
n3:aktivita
n12:I
n3:aktivity
I
n3:cisloPeriodika
4
n3:dodaniDat
n5:2015
n3:domaciTvurceVysledku
n4:6989969 n4:1410679 n4:2216604 n4:7221223 n4:1911686 n4:2387689 n4:2431858
n3:druhVysledku
n9:J
n3:duvernostUdaju
n7:S
n3:entitaPredkladatele
n15:predkladatel
n3:idSjednocenehoVysledku
18197
n3:idVysledku
RIV/00025798:_____/14:00000310
n3:jazykVysledku
n18:eng
n3:klicovaSlova
U–Pb zircon dating, Svratka Unit, Moldanubian Zone, Kutná Hora Unit, European Variscides
n3:klicoveSlovo
n11:Kutn%C3%A1%20Hora%20Unit n11:U%E2%80%93Pb%20zircon%20dating n11:European%20Variscides n11:Svratka%20Unit n11:Moldanubian%20Zone
n3:kodStatuVydavatele
CZ - Česká republika
n3:kontrolniKodProRIV
[F71C3F7CE853]
n3:nazevZdroje
Journal of Geosciences
n3:obor
n17:DB
n3:pocetDomacichTvurcuVysledku
7
n3:pocetTvurcuVysledku
8
n3:rokUplatneniVysledku
n5:2014
n3:svazekPeriodika
59
n3:tvurceVysledku
Veselovský, František Košler, Jan Košuličová, Monika Žáčková, Eliška Pertoldová, Jaroslava Pertold, Zdeněk Verner, Kryštof Konopásek, Jiří
n3:wos
000346149500006
s:issn
1802-6222
s:numberOfPages
22
n6:doi
10.3190/jgeosci.181