Université de Fribourg

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...