Micromorphologie de grèzes litées des Charentes et du Châtillonnais (France).

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Abstract
The micromorphological study of «grèze litée» type deposits makes it possible to better specify some processes involved in the deposition. The proposed interpretations are supported by a recent model of stratified slope deposits based on data from activ andean and alpine milieux, which emphasizes the role of the stone-banked solifluction sheets on beds differentiation. This study points out that transfers of fine particles by eluviation-illuviation play a greater role on the development of some typical features of «grèzes litées» than previously supposed on field observations. Unfrequent processes including run-off and debris-flows were also determined in some exposures. The microscopic examination of «grèzes litées» confirms that depodition occured in connection with superficial freezing and thawing cycles according to the andean model, but some levels corresponding to deep freezing or permafrost were recognized in many quarries.

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