About: Chemical characteristics of zircon from A-type granites and comparison to zircon of S-type granites

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About: Chemical characteristics of zircon from A-type granites and comparison to zircon of S-type granites Goto Sponge NotDistinct Permalink

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	The trace element content in zircons was investigated using back-scattered electron images and electron microprobe analyses. The studied Proterozoic (Wiborg batholith, Finland and Pará, Amazonas and Goiás states, Brazil) and Variscan (Krušné Hory/Erzgebirge, Czech Republic and Germany) plutons cover a wide range of rocks, from large rapakivi-textured geochemically primitive plutons to small intrusions of rare-metal granites. The zircon from the non-mineralized plutons is poor in minor and trace elements; the zircon in moderately fractionated granite varieties is slightly enriched in Hf, Th, U, Y, and HREEs; whereas the zircon in highly fractionated ore-bearing granites may be strongly enriched in Hf (up to 10 wt% HfO2), Th (up to 10 wt% ThO2), U (up to 10 wt% UO2), Y (up to 12 wt% Y2O3), Sc (up to 3 wt% Sc2O3), Nb (up to 5 wt% Nb2O5), Ta (up to 1 wt% Ta2O5), W (up to 3 wt% WO3), F (up to 2.5 wt% F ), P (up to 11 wt% P2O5), and As (up to 1 wt% As2O5). Metamictized zircons may also be enriched in Bi, Ca, Fe, and Al. The increase in the Hf content coupled with the decrease in the Zr/Hf value in zircon is one of the most reliable indicators of granitic magma evolution. The contents of Hf and U in zircon are dependent mainly on the degree of granite fractionation and the nature and volume of the volatile phases and are independent of the A- or S-character of the parental melt. The zircon Zr/Hf ratios 55 and 25 are proposed to approximately distinguish common, moderately evolved and highly evolved granites. Zircons from the moderately and highly evolved granites of A- and S-type can be discriminated on the basis of their HREE content and the U/Th ratios. Nb, Ta, and W are present in zircon from the highly evolved granites from all studied areas, while high As, Bi, and Sc contents are typical only for the Erzgebirge. The trace element content in zircons was investigated using back-scattered electron images and electron microprobe analyses. The studied Proterozoic (Wiborg batholith, Finland and Pará, Amazonas and Goiás states, Brazil) and Variscan (Krušné Hory/Erzgebirge, Czech Republic and Germany) plutons cover a wide range of rocks, from large rapakivi-textured geochemically primitive plutons to small intrusions of rare-metal granites. The zircon from the non-mineralized plutons is poor in minor and trace elements; the zircon in moderately fractionated granite varieties is slightly enriched in Hf, Th, U, Y, and HREEs; whereas the zircon in highly fractionated ore-bearing granites may be strongly enriched in Hf (up to 10 wt% HfO2), Th (up to 10 wt% ThO2), U (up to 10 wt% UO2), Y (up to 12 wt% Y2O3), Sc (up to 3 wt% Sc2O3), Nb (up to 5 wt% Nb2O5), Ta (up to 1 wt% Ta2O5), W (up to 3 wt% WO3), F (up to 2.5 wt% F ), P (up to 11 wt% P2O5), and As (up to 1 wt% As2O5). Metamictized zircons may also be enriched in Bi, Ca, Fe, and Al. The increase in the Hf content coupled with the decrease in the Zr/Hf value in zircon is one of the most reliable indicators of granitic magma evolution. The contents of Hf and U in zircon are dependent mainly on the degree of granite fractionation and the nature and volume of the volatile phases and are independent of the A- or S-character of the parental melt. The zircon Zr/Hf ratios 55 and 25 are proposed to approximately distinguish common, moderately evolved and highly evolved granites. Zircons from the moderately and highly evolved granites of A- and S-type can be discriminated on the basis of their HREE content and the U/Th ratios. Nb, Ta, and W are present in zircon from the highly evolved granites from all studied areas, while high As, Bi, and Sc contents are typical only for the Erzgebirge. (en)
Title	Chemical characteristics of zircon from A-type granites and comparison to zircon of S-type granites Chemical characteristics of zircon from A-type granites and comparison to zircon of S-type granites (en)
skos:prefLabel	Chemical characteristics of zircon from A-type granites and comparison to zircon of S-type granites Chemical characteristics of zircon from A-type granites and comparison to zircon of S-type granites (en)
skos:notation	RIV/67985831:_____/14:00427394!RIV15-AV0-67985831
http://linked.open...avai/riv/aktivita	I
http://linked.open...avai/riv/aktivity	I
http://linked.open...iv/cisloPeriodika	April
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Breiter, Karel
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	Geologický ústav AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	7069
http://linked.open...ai/riv/idVysledku	RIV/67985831:_____/14:00427394
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	zircon; A-type granites; S-type granites; Wiborg batholith; Brazil; Krušné hory/Erzgebirge (en)
http://linked.open.../riv/klicoveSlovo	zircon A-type granites Krušné hory/Erzgebirge S-type granites Wiborg batholith Brazil
http://linked.open...odStatuVydavatele	NL - Nizozemsko
http://linked.open...ontrolniKodProRIV	[10C81CFFDE7E]
http://linked.open...i/riv/nazevZdroje	Lithos
http://linked.open...in/vavai/riv/obor	DD
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	4 (xsd:int)
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	1192/195
http://linked.open...iv/tvurceVysledku	Breiter, Karel Dall'Agnol, R. Krás Borges, R. M. Lamarão, C. N.
http://linked.open...ain/vavai/riv/wos	000335102100014
issn	0024-4937
number of pages	18 (xsd:int)
http://bibframe.org/vocab/doi	10.1016/j.lithos.2014.02.004

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