Variscan high-pressure metamorphism of kyanite-bearing paragneisses hosting eclogites in the Veporic unit, Western Carpathians: Evidence from Th-U-Pb dating of monazite
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14740%2F20%3A00118369" target="_blank" >RIV/00216224:14740/20:00118369 - isvavai.cz</a>
Result on the web
<a href="http://www.geologicacarpathica.com/browse-journal/volumes/71-6/article-961/" target="_blank" >http://www.geologicacarpathica.com/browse-journal/volumes/71-6/article-961/</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.31577/GeolCarp.71.6.1" target="_blank" >10.31577/GeolCarp.71.6.1</a>
Alternative languages
Result language
angličtina
Original language name
Variscan high-pressure metamorphism of kyanite-bearing paragneisses hosting eclogites in the Veporic unit, Western Carpathians: Evidence from Th-U-Pb dating of monazite
Original language description
In view of a polyphase development of the northern Veporic pre-Alpine basement of the Western Carpathians it is important to determine the age of high pressure (HP) metamorphism known from eclogites occurring in this area. To do this, several monazite-bearing paragneisses were studied petrologically and monazite was dated by chemical (U-Th-Pb) method. Identified were remnants from high-pressure stage, i.e. phengite (Si apfu =3.2-3.3), kyanite, rutile and Ca-rich garnet rims. Part of the present mineral assemblage may have been preserved from prograde stage (plagioclase) and part reflects re-equilibration during retrogression (biotite, major elements in garnet cores). However, Y and HREE in garnet cores were not homogenised and their profiles indicate origin during temperature rise. Peak metamorphic conditions (P =21 kbar; T =650 degrees C), and retrogression stage (P = 9 kbar; T =520 degrees C) were calculated using Zr-in-rutile, and Y-in-garnet and monazite thermometry, phengite composition and pseudosection modelling. Monazite yielded dominant Early Carboniferous age (354 Ma) with subordinate amounts of Ordovician (485 Ma) and Cambrian (505 Ma) ones, and no Alpine record. The monazite position in garnet cores predating the growth of Ca rims suggest that the Carboniferous age of 354 Ma probably predates the peak conditions and refers to the prograde stage of the Variscan metamorphic evolution.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10505 - Geology
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Geologica Carpathica
ISSN
1335-0552
e-ISSN
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Volume of the periodical
71
Issue of the periodical within the volume
6
Country of publishing house
SK - SLOVAKIA
Number of pages
23
Pages from-to
„485“-„+“
UT code for WoS article
000607216600001
EID of the result in the Scopus database
2-s2.0-85100751965