Reponse sur l'origine de l'accumulation de loess du Pleistocene superieur de Techine (Sud-Tunisien)

Coudé-Gaussen, Geneviève; Mosser, C.; Rognon, Pierre; Tourenq, J.

doi:10.2113/gssgfbull.s7-xxv.4.637

Cited by 4 publications

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“…The heavy mineral assemblage found in the upper layers of the Techine and Zmertene sections shows evidence of a desert origin for the loess: this assemblage is comparable to that in the Great Eastern Erg (Coude-Gaussen et al, 1982a;Coude-Gaussen et al, 1983b). During the Upper Pleistocene, the trajectory of the polar depressions hugged the northern border of the Sahara (Rognon, 1976;1979).…”

Section: The Desert Origin Of the Loessmentioning

confidence: 93%

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The upper pleistocene loess of southern Tunisia: A statement

Coudé-Gaussen

Rognon

1988

Earth Surf Processes Landf

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On the Matmata Plateau, the sedimentological characteristics of the peri-desert loess and the interbedded palaeosols (particle-size distribution; chemical and mineralogical composition of major components; trace elements; clay mineral assemblage; heavy mineral assemblage; SEM-examined surficial textures of the quartz and palygorskite grains) show notable homogeneity: they also indicate its allochthonous origins (the main sedimentary source being the Great Eastern Erg), its transport as an aeolian suspension sediment prior to deposition, and moderate pedogenesis acting during deposition. The emplacement of the loess was synchronous with a 'pluvial' steppe palaeoenvironment moister than at present, asshown by "0 and 13C data. The palaeosols point to a weak pedogenesis and colluvial and alluvial reworking that were contemporary with the aeolian deposition. 14C radiometric dating suggests a main period of pluvial dust-fall/loess deposition in the Upper Pleistocene (until loo00 yr BP) and a shorter one in the Middle Holocene.

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Section: The Desert Origin Of the Loessmentioning

confidence: 93%

“…For a short time during the Middle Holocene (6000 to 4000yr BP) climatic conditions were moister, resulting in a final and very thin deposition of loess. Slope and alluvial processes reworked those loesses and formed a low-level sandy-silty deposit along the main wadis (Coude-Gaussen, 1984a;Rognon et al, 1983).…”

Section: The Middle Holocene Loessic Deposirionmentioning

confidence: 99%