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Forms and deposits of the continental quaternary of the Saharan margin of Eastern Maghreb (tentative synthesis)

Abstract : The Saharan margin of Eastern Maghreb extends from Auras in the West to the Gulf of Gab~s in the East. The Plio-Quaternary boundary is very complex in the West where it is characterized by the persistence of Tertiary sedimentation with the development of ablation forms, presence of crusts and the form ation of a lacustrine system. This is followed by the development of accumulation forms during the Middle Pleistocene and mostly during the Upper Pleistocene to Holocene with contemporaneous diminution in the gra~ulometry of the deposits. The evolution of gyperetes at the expense of calcretes crust suffered a partial reverse during the Middle Pleistocene. At this time a lacustrine phase settled down in the Algero-Tunisian Chotts (sebkhas). The end of the Middle-Pleistocene corresim~ded with a major climatic break with the disappearance of the calcrctes. By the end of the Upper Pleistocene, the gylx~etes attained their maximum development and latter disappeared during the Holocene.
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Contributor : Jean-Louis BALLAIS Connect in order to contact the contributor
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Jean-Louis Ballais, Hédi Ben Ouezdou. Forms and deposits of the continental quaternary of the Saharan margin of Eastern Maghreb (tentative synthesis). Journal of African Earth Sciences, 1991, 12 (1/2), pp.209 - 216. ⟨10.1016/0899-5362(91)90070-F⟩. ⟨hal-01562556⟩



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