In order to assess the Pan-African structural evolution from early orogenic fabrics through
Najd wrenching to the latest orogenic collapse/extension, the authors used field work, aided
by aerial photographs and satellite images. This work is complemented by the study of the
anisotropy of the magnetic susceptibility (AMS, or magnetic fabric). The Pan-African rock
associations of the Um Gheig-Kadabora area can be divided into a lower tier composed
mainly of amphibolite–migmatite and granitoid gneisses, and an upper tier of ophiolitic …