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Supplements of Geografia Fisica e Dinamica Quaternaria
Volume VI - 2003


Fifth International Conference on Geomorphology (Tokio, Japan , 2001) - Geomorphologic Revolutions and Quaternary Environmental Changes


A new chronology of upper Holocene Aeolian sands in the Zibans Range, Algeria

Pages 47-54


The existence of a tran satlasic aeolian system through the eastern Saharian Atlas point out massive migrations of mobile sands from the High Plains in the North, to the Sahara desert to the South and confirm that in Algeria, there is not a progression of desert ification from the Sahara toward the North. The age of these sand displacements is ancient and dates back to the upper Pleistocene and the Holocene. A new chronology of upp er Ho locene , sup ported by 12 new datings 14C indic ates variations of arid periods and humid per iods. Th is new chronology caracterise an evolut ion stage since 4000 BP marked by the rapidity of paleoenviron – ment s instabilities during the upper Holocene period through the Zibans range with the development of four sequences: a humid phase durin g 3300-3000 14C yr BP; an arid phase during 2900-2500 14C yr BP; a humi d phase during 2400-2200 14C yr BP; an arid period between 2200 and 1650 14C yr BP dominated by incision of rivers where man’s role became more and more higher. The present day remobilisation of sands doesn’t justify an aridification of the climate.

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