Prograde and retrograde P–T evolution of a Variscan high-temperature eclogite, French Massif Central, Haut-Allier
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F20%3A00000149" target="_blank" >RIV/00025798:_____/20:00000149 - isvavai.cz</a>
Result on the web
<a href="https://www.bsgf.fr/articles/bsgf/full_html/2020/01/bsgf190058/bsgf190058.html" target="_blank" >https://www.bsgf.fr/articles/bsgf/full_html/2020/01/bsgf190058/bsgf190058.html</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1051/bsgf/2020016" target="_blank" >10.1051/bsgf/2020016</a>
Alternative languages
Result language
angličtina
Original language name
Prograde and retrograde P–T evolution of a Variscan high-temperature eclogite, French Massif Central, Haut-Allier
Original language description
The P–T evolution of a mafic eclogite sample from the Haut-Allier was studied in order to constrain the dynamic of the Variscan subduction in the eastern French Massif Central. Three successive metamorphic stages M1, M2 and M3, are characterized by assemblages comprising garnet1-omphacite-kyanite, garnet2-plagioclase, and amphibole-plagioclase, respectively, and define a clockwise P–T path. These events occurred at the conditions of eclogite (M1; ∼ 20 kbar, 650 °C to ∼ 22.5 kbar, 850 °C), high-pressure granulite (M2; 19.5 kbar and 875 °C) and high-temperature amphibolite facies (M3; < 9 kbar, 750–850 °C), respectively. Pseudosection modelling of garnet growth zoning and mineralogy of the inclusions reveal a prograde M1 stage, first dominated by burial and then by near isobaric heating. Subsequent garnet1 resorption, prior to a renewed growth of garnet2 is interpreted in terms of a decompression during M2. High-pressure partial melting is predicted for both the M1 temperature peak and M2. M3 testifies to further strong decompression associated with limited cooling. The preservation of garnet growth zoning indicates the short-lived character of the temperature increase, decompression and cooling cycle. We argue that such P–T evolution is compatible with the juxtaposition of the asthenosphere against the subducted crust prior to exhumation driven by slab rollback.
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
—
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
BSGF- Earth Sciences Bulletin
ISSN
0037-9409
e-ISSN
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Volume of the periodical
191
Issue of the periodical within the volume
June : 14
Country of publishing house
FR - FRANCE
Number of pages
14
Pages from-to
nestránkováno
UT code for WoS article
000540314900002
EID of the result in the Scopus database
2-s2.0-85089410266