ABSTRACT
Field, petrographic and geochemical investigations have shwon the ophiolitic origin of the studied Keraf complex which was generated in a minor back-arc basin between the reworked pre-Pan-African Bayuda terrane and the juvenile Gabgaba terrane of the Nubian Shield. The Keraf ophiolite marks part of a N-S suture (Gabgaba Suture) which partly follows the boundary between the Nubian Shield and a disintegrated craton west of the Nile. The boundary between these two major geodynamic systems is a broad swinging zone.
