Abstract
The northwestern margin of the Red Sea superbly displays the interrelationships between the tectonics and sedimentation in rift basins and allows identifying a variety of structural styles controlling the development of coarse-grained fan-delta systems in extensional settings. Detailed field mapping of the rift structures and stratigraphy as well as examining the sedimentary facies indicted that relay ramps, interactions between rift-parallel faults, cross-rift faults and shear zones, as well as accommodation zones, combined with plunge variations of the basement blocks, have been the main factors that controlled the development and geometry of the Miocene syn-rift, coarse-grained fan delta systems, and their localization at specific sediment-input sites in the rift margin. These factors also strongly influenced the sediment dispersal patterns and paleocurrent directions of the syn-rift clastic sediments. In this chapter we propose three conceptual models for the structural styles controlling the syn-rift sedimentation in the northwestern margin of the Red Sea and discuss their relevance to other rift systems throughout the world.
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