Variscan eclogites from the Argentera–Mercantour Massif (External Crystalline Massifs, SW Alps): a dismembered cryptic suture zone

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F20%3A00000190" target="_blank" >RIV/00025798:_____/20:00000190 - isvavai.cz</a>

Výsledek na webu

<a href="https://link.springer.com/article/10.1007/s00531-020-01848-2" target="_blank" >https://link.springer.com/article/10.1007/s00531-020-01848-2</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s00531-020-01848-2" target="_blank" >10.1007/s00531-020-01848-2</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Variscan eclogites from the Argentera–Mercantour Massif (External Crystalline Massifs, SW Alps): a dismembered cryptic suture zone

Popis výsledku v původním jazyce

We document structural, geochemical, petrological and 40Ar/39Ar geochronological data performed on Variscan eclogitesfrom the Argentera–Mercantour Massif, southwestern Alps. Based on the high-resolution field mapping, we present neweclogite occurrences and discuss the relationships between eclogites and surrounding migmatites. We recognized for the firsttime preserved eclogite facies assemblages. Trace elements and REE patterns establish that eclogites protoliths are MORBscontaminated by continental crust. Standard thermobarometry and thermodynamic modeling are consistent with P–T valuesof 640–740 °C for 1.5 ± 0.25 GPa, coherent with paleo-geotherms predicted for warm subduction of oceanic crust. We interpretthese eclogites as a dismembered cryptic suture zone. 40Ar/39Ar dating on amphiboles yields an age of 339.7 ± 12 Mafor eclogite retrogression under amphibolite facies conditions. All these data are combined to link the Argentera–MercantourMassif in the tectonic framework of both pre-Mesozoic Alpine basement and European southern Variscides.

Název v anglickém jazyce

Variscan eclogites from the Argentera–Mercantour Massif (External Crystalline Massifs, SW Alps): a dismembered cryptic suture zone

Popis výsledku anglicky

We document structural, geochemical, petrological and 40Ar/39Ar geochronological data performed on Variscan eclogitesfrom the Argentera–Mercantour Massif, southwestern Alps. Based on the high-resolution field mapping, we present neweclogite occurrences and discuss the relationships between eclogites and surrounding migmatites. We recognized for the firsttime preserved eclogite facies assemblages. Trace elements and REE patterns establish that eclogites protoliths are MORBscontaminated by continental crust. Standard thermobarometry and thermodynamic modeling are consistent with P–T valuesof 640–740 °C for 1.5 ± 0.25 GPa, coherent with paleo-geotherms predicted for warm subduction of oceanic crust. We interpretthese eclogites as a dismembered cryptic suture zone. 40Ar/39Ar dating on amphiboles yields an age of 339.7 ± 12 Mafor eclogite retrogression under amphibolite facies conditions. All these data are combined to link the Argentera–MercantourMassif in the tectonic framework of both pre-Mesozoic Alpine basement and European southern Variscides.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

International Journal of Earth Sciences

ISSN

1437-3254

e-ISSN

—

Svazek periodika

109

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

22

Strana od-do

1273-1294

Kód UT WoS článku

000522586200002

EID výsledku v databázi Scopus

2-s2.0-85082957144