Intra-oceanic arc growth driven by magmatic and tectonic processes recorded in the Neoproterozoic Bougmane arc complex (Anti-Atlas, Morocco)

A. Triantafyllou (1) , J. Berger (2) , J. M. Baele (3) , Olivier Bruguier (4) , Hervé Diot (1) , N. Ennih (5) , C. Monnier (1) , G. Plissart (6) , S. Vandycke (3) , A. Watlet (3)

1 LPG - Laboratoire de Planétologie et Géodynamique [UMR 6112]
2 GET - Géosciences Environnement Toulouse
3 UMons - Université de Mons
4 Géosciences Montpellier
5 UCD - Université Chouaib Doukkali
6 Universidad Austral de Chile

The Bougmane complex represents the lower crustal section of a Neoproterozoic oceanic arc.Successive arc magmatic pulses triggered the ‘garnetisation’ of hydrous arc mafics and the in situ formation of tonalitic melt via dehydration and dehydration-melting reactions.Moroccan oceanic arc relics reached a significant crustal thickness (>30–35 km) via a combination of intra-oceanic magmatic and tectonic processes.

Mots clés: Arc growth; HP dehydration; Rutile dating; Garnet granulite; Neoproterozoic; Pan-African orogeny; Dehydration melting; Inttra-arc differentiation

Domaines: Pétrographie

A. Triantafyllou, J. Berger, J. M. Baele, Olivier Bruguier, Hervé Diot, et al.. Intra-oceanic arc growth driven by magmatic and tectonic processes recorded in the Neoproterozoic Bougmane arc complex (Anti-Atlas, Morocco). Precambrian Research, 2018, 304, pp.39-63. ⟨10.1016/j.precamres.2017.10.022⟩. ⟨hal-01737911⟩