Boudad, L. and Kabiri, L. and Weisrock, A. and Wengler, L. and Fontugne, M. and El Maataoui, M. and Makayssi, A. and Vernet, J.-L. (2003) Upper Pleistocene and Holocene fluvial sedimentation in the « Plain » of tazoughmit (Oued Rheris, High Atlas southern piedmont of Goulmima, Morocco) Les formations fluviatiles du Pléistocène supérieur et de l'Holocène dans la « Plaine » de tazoughmit (Oued Rheris, piémont sud-atlasique de Goulmima, Maroc). Quaternaire, 14 (3). pp. 139-154.

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On the southern piedmont of the calcareous eastern High Atlas, the fan-deposited superficial Quaternary sedimentary formations of the oued Rheris, in the Tazoughmit plain, belong to the Upper Pleistocene (= recent Soltanian, called here « M'Zlarad formation »). An inset terrace (Holocene, or Rharbian terrace, called here « Tamda formation ») develops inside the M'Zlarad formation. Several stratigraphic units are observed in these two formations. The M'Zlarad formation begins with the usual coarse detritic piedmont series, overcomed by more or less clayey series of silts, with slightly indurated CaCO3 enriched zones that are well-knowned in the Moroccan Soltanian ; at its upper part we find a clayey and silty hydromorphic serie of palustrine origin, which was dated at 19 465 ± 150 y. B.P. Above this, the formation is overlayed by new reddish silts and more coarse material of the upper pediment slope. The Tamda formation was built inset at the Upper Holocene (3 540 ± 60 y. B.P.), after a distinctive linear erosion period into the Plain of Tazoughmit. It seems that the sedimentary area was transported meanwhile downstream Goulmima, where the oued Rheris built a second large fan, which upper sediments were dated from 12 345 ± 110 y. B.P. These first results are in good agreement with the previous knowledges concerning the High Atlas and Anti Atlas piedmonts evolution during the Upper Pleistocene and the Holocene, and also the surrounding areas of the Maghreb. They show the installation of a wet, biostasic period between 22 000 and 18 000 y. B.P., and then of an arid. rhexistasic, erosion period before the deposition of the Lower Holocene sediments. A long time after, a new alluvial terrace took place at about 3 500 y. B.P., during an humid recurrence. These results show the great complexity of the relation between alluviation / erosion phases and climatic variations and the necessity of new researches about the Upper Pleistocene/Holocene transition period.

Item Type: Article
Uncontrolled Keywords: alluvial deposit; geomorphology; Holocene; paleoclimate; paleoenvironment; Pleistocene; sedimentology, Africa; Morocco; North Africa
Subjects: Earth and Planetary Sciences
Divisions: SCIENTIFIC PRODUCTION > Earth and Planetary Sciences
Depositing User: Administrateur Eprints Administrateur Eprints
Last Modified: 31 Jan 2020 15:46

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