On the occurrence of a Variscan eclogite in the Argentera-Mercantour Massif, Western Alps: Implications for the evolution of the southern Variscan belt
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F24%3A10169102" target="_blank" >RIV/00025798:_____/24:10169102 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1130/B37010.1" target="_blank" >https://doi.org/10.1130/B37010.1</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1130/B37010.1" target="_blank" >10.1130/B37010.1</a>
Alternative languages
Result language
angličtina
Original language name
On the occurrence of a Variscan eclogite in the Argentera-Mercantour Massif, Western Alps: Implications for the evolution of the southern Variscan belt
Original language description
The newfound Bois de Sélasse eclogite in the eastern Argentera-Mercantour Massif (External Crystalline Massifs, Western Alps) is crucial for better constraining the tectonic evolution of the southern part of the European Variscan belt. The whole-rock composition of this eclogite aligns with that of a basaltic protolith with a normal mid-oceanic-ridge affinity, and U-Pb dating on igneous zircon cores reveals an emplacement age of 524 +- 5 Ma. The emplacement may have occurred either in the oceanic lithosphere to the north of the active Gondwana margin or within a back-arc basin during the subduction beneath Gondwana. Exceptionally preserved prehnite-pumpellyite to eclogite facies minerals provide evidence of prograde metamorphism along a standard oceanic subduction geotherm (LESS-THAN OR EQUAL TO10 oC/km). Peak eclogite facies conditions are constrained at 610-660 oC and 1.9-2.3 GPa by thermodynamic modeling combined with Ti-in-zircon and Zr-in-rutile thermometry. A minimum age for eclogite facies metamorphism is established at 339 +- 6 Ma by U-Pb dating on metamorphic zircon rims. The protolith of the Bois de Sélasse eclogite is indeed older than the Variscan oceans, but it was similarly affected by Variscan subduction. We discuss the implications of this new finding in the context of the European Variscan belt.
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
V - Vyzkumna aktivita podporovana z jinych verejnych zdroju
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Bulletin of the Geological Society of America
ISSN
0016-7606
e-ISSN
1943-2674
Volume of the periodical
136
Issue of the periodical within the volume
9-10
Country of publishing house
US - UNITED STATES
Number of pages
17
Pages from-to
4018-4034
UT code for WoS article
001334344900001
EID of the result in the Scopus database
2-s2.0-85203428309