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Discovery of an albite gneiss from the Ile de Groix (Armorican Massif, France): geochemistry and LA-ICP-MS U-Pb geochronology of its Ordovician protolith

El Korh, Afifé ; Schmidt, Susanne ; Ballèvre, Michel ; Ulianov, Alexey ; Bruguier, Olivier

In: International Journal of Earth Sciences, 2012, vol. 101, no. 5, p. 1169-1190

Permian magmatism and metamorphism in the Dent Blanche nappe: constraints from field observations and geochronology

Manzotti, Paola ; Rubatto, Daniela ; Zucali, Michele ; El Korh, Afifé ; Cenki-Tok, Bénédicte ; Ballèvre, Michel ; Engi, Martin

In: Swiss Journal of Geosciences, 2018, vol. 111, no. 1–2, p. 79–97

In the Dent Blanche Tectonic System, the Mont Morion biotite-bearing granite is a km- scale intrusion preserved in a low-strain volume. Zircon saturation thermometry suggests that it crystallised from a melt that reached about 800 °C. U–Pb zircon and allanite geochronology indicates crystallization of the magma in the Permian (290 ± 3 Ma; 280 ± 8 Ma, respectively). Migmatitic...

Iron isotope fractionation in subduction-related high-pressure metabasites (Ile de Groix, France)

El Korh, Afifé ; Luais, Béatrice ; Deloule, Etienne ; Cividini, Damien

In: Contributions to Mineralogy and Petrology, 2017, vol. 172, no. 6, p. 41

Characterisation of mass transfer during subduction is fundamental to understand the origin of compositional heterogeneities in the upper mantle. Fe isotopes were measured in high-pressure/low-temperature metabasites (blueschists, eclogites and retrograde greenschists) from the Ile de Groix (France), a Variscan high-pressure terrane, to determine if the subducted oceanic crust contributes to...