Abstract
The Ajjaj shear zone of the Njad fault system of northwestern Saudi Arabia was a conduit for Pan-African (500-700 m.y.) calc-alkalic and peralkalic magmas. Ductility contrasts between the wall rocks and the deformed rocks of the shear zone were responsible for differences in size, intrusion mechanism, and degree of deformation of the granites. A quantitative strain analysis across the Ajjaj shear zone reveals a finite oblique strike-slip displacement of with a vertical displacement component of . Granite diapirs were intruded within the region of volume gain; between 83-90% of the volume of the Ash Sha'b diapir was produced by expansion of the granite. Changes in late Pan-African granite magmatism, especially abrupt variations in alkalic granite distribution, can be indirectly linked with the vertical displacement components of the crustal blocks flanking the Ajjaj shear belt.
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