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Statements

Subject Item
n2:RIV%2F00025798%3A_____%2F12%3A00000586%21RIV13-MSM-00025798
rdf:type
skos:Concept n7:Vysledek
dcterms:description
U–Pb zircon dating is combined with petrology, Zr-in-rutile thermometry and mineral equilibria modelling to discuss zircon petrogenesis and the age of metamorphism in three units of the Variscan Vosges Mountains (NE France). The monotonous gneiss unit shows results at 700–500 Ma, but no Variscan ages. The varied gneiss unit preserves ages between 600 and 460 Ma and a Variscan group at 340–335 Ma. Zircon analyses from the felsic granulite unit define a continuous array of ages between 500 and 340 Ma. In varied gneiss samples, zoned garnet includes kyanite and rutile and is surrounded by matrix sillimanite and cordierite. In a pseudosection, it points to peak conditions of *16 kbar/850 C followed by isothermal decompression to 8–10 kbar/820–860 C. In felsic granulite samples, the assemblage K-feldspar– garnet–kyanite–Zr-rich rutile is replaced by sillimanite and Zr-poor rutile. Modelling these assemblages supports minimum conditions of *13 kbar/925 C, and a subsequent P–T decrease to 6.5–8.5 kbar/800–820 C. The internal structure and chemistry of zircons, and modelling of zircon dissolution/growth along the inferred P–T paths are used to discuss the significance of the U–Pb ages. In the monotonous unit, inherited zircon ages of 700–500 Ma point to sedimentation during the Late Cambrian, while medium-grade metamorphism did not allow the formation of Variscan zircon domains. In both the varied gneiss and felsic granulite units, zircons with a blurred oscillatoryzoned pattern could reflect solid-state recrystallization of older grains during HT metamorphism, whereas zircons with a dark cathodoluminescence pattern are thought to derive from crystallization of an anatectic melt during cooling at middle pressure conditions. The present work proposes that U–Pb zircon ages of ca. 340 Ma probably reflect the end of a widespread HT metamorphic event at middle crustal level. U–Pb zircon dating is combined with petrology, Zr-in-rutile thermometry and mineral equilibria modelling to discuss zircon petrogenesis and the age of metamorphism in three units of the Variscan Vosges Mountains (NE France). The monotonous gneiss unit shows results at 700–500 Ma, but no Variscan ages. The varied gneiss unit preserves ages between 600 and 460 Ma and a Variscan group at 340–335 Ma. Zircon analyses from the felsic granulite unit define a continuous array of ages between 500 and 340 Ma. In varied gneiss samples, zoned garnet includes kyanite and rutile and is surrounded by matrix sillimanite and cordierite. In a pseudosection, it points to peak conditions of *16 kbar/850 C followed by isothermal decompression to 8–10 kbar/820–860 C. In felsic granulite samples, the assemblage K-feldspar– garnet–kyanite–Zr-rich rutile is replaced by sillimanite and Zr-poor rutile. Modelling these assemblages supports minimum conditions of *13 kbar/925 C, and a subsequent P–T decrease to 6.5–8.5 kbar/800–820 C. The internal structure and chemistry of zircons, and modelling of zircon dissolution/growth along the inferred P–T paths are used to discuss the significance of the U–Pb ages. In the monotonous unit, inherited zircon ages of 700–500 Ma point to sedimentation during the Late Cambrian, while medium-grade metamorphism did not allow the formation of Variscan zircon domains. In both the varied gneiss and felsic granulite units, zircons with a blurred oscillatoryzoned pattern could reflect solid-state recrystallization of older grains during HT metamorphism, whereas zircons with a dark cathodoluminescence pattern are thought to derive from crystallization of an anatectic melt during cooling at middle pressure conditions. The present work proposes that U–Pb zircon ages of ca. 340 Ma probably reflect the end of a widespread HT metamorphic event at middle crustal level.
dcterms:title
The origin of zircon and the significance of U–Pb ages in high-grade metamorphic rocks: a case study from the Variscan orogenic root (Vosges Mountains, NE France) The origin of zircon and the significance of U–Pb ages in high-grade metamorphic rocks: a case study from the Variscan orogenic root (Vosges Mountains, NE France)
skos:prefLabel
The origin of zircon and the significance of U–Pb ages in high-grade metamorphic rocks: a case study from the Variscan orogenic root (Vosges Mountains, NE France) The origin of zircon and the significance of U–Pb ages in high-grade metamorphic rocks: a case study from the Variscan orogenic root (Vosges Mountains, NE France)
skos:notation
RIV/00025798:_____/12:00000586!RIV13-MSM-00025798
n7:predkladatel
n16:ico%3A00025798
n3:aktivita
n12:P
n3:aktivity
P(LK11202)
n3:cisloPeriodika
6
n3:dodaniDat
n4:2013
n3:domaciTvurceVysledku
n9:5645719
n3:druhVysledku
n13:J
n3:duvernostUdaju
n17:S
n3:entitaPredkladatele
n19:predkladatel
n3:idSjednocenehoVysledku
157127
n3:idVysledku
RIV/00025798:_____/12:00000586
n3:jazykVysledku
n5:eng
n3:klicovaSlova
U–Pb zircon dating, Mineral equilibria, modelling, HP granulite, Zircon petrogenesis, Variscan, Vosges Mountains
n3:klicoveSlovo
n8:HP%20granulite n8:Variscan n8:U%E2%80%93Pb%20zircon%20dating n8:Mineral%20equilibria n8:modelling n8:Zircon%20petrogenesis n8:Vosges%20Mountains
n3:kodStatuVydavatele
DE - Spolková republika Německo
n3:kontrolniKodProRIV
[2CD859DE9D3D]
n3:nazevZdroje
Contributions to Mineralogy and Petrology
n3:obor
n10:DB
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
3
n3:projekt
n11:LK11202
n3:rokUplatneniVysledku
n4:2012
n3:svazekPeriodika
164
n3:tvurceVysledku
Skrzypek, Etienne Cocherie, A. Štípská, Pavla
n3:wos
000310999100002
s:issn
0010-7999
s:numberOfPages
23
n18:doi
10.1007/s00410-012-0781-1