Neoproterozoic magmatic evolution of the southern Ouaddaï Massif (Chad) Félix Djerossem, Julien Berger, Olivier Vanderhaeghe, Moussa Isseini, Jérôme Ganne and Armin Zeh BSGF - Earth Sci. Bull., 191 (2020) 34 Published online: 24 November 2020 DOI: 10.1051/bsgf/2020032