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

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Abstract

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

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Acknowledgements

We thank Stephen Collett and an anonymous reviewer for their generous, thoughtful and detailed comments on an early version of this manuscript. Italian authors acknowledge funding by PSR2019-IBOLLATI (University of Milano). We thank Pavla Štípská for her editorial work.

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Authors and Affiliations

  1. Université Côte d’Azur, Observatoire Côte d’Azur, Geoazur, 250 Rue A. Einstein, 06560, Sophia-Antipolis, Valbonne, France

    Fabrice Jouffray, Jean Marc Lardeaux, Marco Filippi & Michel Corsini

  2. Dipartimento di Scienze della Terra ‘‘A. Desio”,, Università degli Studi di Milano, via Mangiagalli 34, 20133, Milan, Italy

    Maria Iole Spalla, Marco Filippi, Davide Zanoni, Michele Zucali & Guido Gosso

  3. Center for Lithospheric Research, Czech Geological Survey, 11821, Prague 1, Czech Republic

    Jean Marc Lardeaux

  4. Dipartimento Di Scienze Della Terra E Dell’Ambiente, Università degli Studi di Pavia, Pavia, Italy

    Gisella Rebay

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  1. Fabrice Jouffray
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Correspondence to Fabrice Jouffray.

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Jouffray, F., Spalla, M.I., Lardeaux, J.M. et al. Variscan eclogites from the Argentera–Mercantour Massif (External Crystalline Massifs, SW Alps): a dismembered cryptic suture zone. Int J Earth Sci (Geol Rundsch) 109, 1273–1294 (2020). https://doi.org/10.1007/s00531-020-01848-2

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