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The Lower Devonian succession of the Murzuq Basinossible indicators of eustatic and tectonic controls on sedimentation-Chapter 21

DOI: 10.1016/b978-044450611-5/50023-4


Publisher Summary This chapter discusses that the lower Devonian Tadrart and Ouan Kasa formations have been studied in outcrop on the southwest flank of the basin and, also, by the use of subsurface data from the center of the basin. These formations comprise seven facies associations, representing initial deposition by coarse-clastic braided fluvial systems, followed by paralic, and finally, ferruginous oolitic deposits. The intercalation of these facies associations suggests a number of base-level fluctuations during the early Devonian that juxtaposed alluvial and marine facies. Several phases of tectonism are also interpreted to have occurred, resulting in lateral variations in subsidence rate, and also, in the uplift and erosion of early and pre-Devonian deposits near a number of large structural features.

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