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)

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F12%3A00000586" target="_blank" >RIV/00025798:_____/12:00000586 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1007/s00410-012-0781-1" target="_blank" >http://dx.doi.org/10.1007/s00410-012-0781-1</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s00410-012-0781-1" target="_blank" >10.1007/s00410-012-0781-1</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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)

Popis výsledku v původním jazyce

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. Invaried 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

Název v anglickém jazyce

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)

Popis výsledku anglicky

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. Invaried 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

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

DB - Geologie a mineralogie

OECD FORD obor

—

Projekt

<a href="/cs/project/LK11202" target="_blank" >LK11202: Role paleozoických akrečních a kolizních orogénů na tvorbu a růst kontinentální kůry</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2012

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Contributions to Mineralogy and Petrology

ISSN

0010-7999

e-ISSN

—

Svazek periodika

164

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

23

Strana od-do

935-957

Kód UT WoS článku

000310999100002

EID výsledku v databázi Scopus

—