Comparaison entre pollen etmicroorganismes dans les sédiments marins du Quaternaire récent du Golfe de Gabès (Tunisie)

Abstract

Pollen analysis of marine deposits of the Gulf of Gabes and the Kerkennah Plateau allows to follow the Tunisian vegetation history and the paleoclimatic evolution over at least the last 30 000 years. The comparison of the botanical events with the microorganism associations displays a sufficiently good conformity between the pollen and spores and the calcareous nannofossils. On the other hand, there is a discrepancy between the pollinic zonation and the ostracods, foraminifera and dinoflagellates associations. Otherwise the palynology stresses both great variations in the sedimentation ratio from one site to the next and the importance of the Holocene sedimentation in the inner part of the Gulf. Besides the Holocene deposits also spread into the Eastern part of the platform. The palynology also allows to reveal some interesting points about the variations of the shoreline recorded by the sedimentary evolution of the Gulf and micropaleontological assemblages.