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Paleoenvironment Evolution of a Paralic System, El Guettiate and Dreïaa Sebkhas (Gulf of Gabès, Tunisia)

  • Zeineb GargouriEmail author
  • Kamel Zouari
Chapter
Part of the Advances in Science, Technology & Innovation book series (ASTI)

Abstract

The Holocene sedimentary record of El Guettiate and Dreïaa sebkhas located on the southern littoral of Skhira, Gulf of Gabès in Tunisia is expressed by five deposit units, unconformably overlying the continental clay sediment of the Mio-Pliocene. Sedimentological and palaeontological analyses and 14C dating provide palaeoenvironmental information for the reconstruction of shoreline changes of Skhira-Gabès littoral and the progressive infilling of both sebkhas over the last 10,000 years. The sedimentary package of this cycle starts with the marine transgression between 8770 and 4000 14C years BP. This oldest unit consists of muddy bioclastic. The following unit is dated 3300 to 1500 14C years BP and consists of mud and sand. The third unit is dated around 1307 to 558 14C years BP. It consists of muddy sand. The fourth unit marking the filling of the sebkhas is a continental deposit which is rich in gypsum crystals. The last and fifth units on top of these sedimentary units have a microbial mat environment. The sebkhas under investigation were isolated from the open sea since 558 years BP due to the decrease of the marine influence and the increase of continental influence (clays and silts deposits) under an arid climate. The main factors controlling the Holocene sedimentary dynamics in this paralic system of southern Tunisia are the fluvial inputs, the relative sea level fluctuation and changes in local climate.

Keywords

Sedimentology Sea level fluctuation Paleoenvironment Sebkhas Shoreline changes Holocene Southern Tunisia 

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Laboratoire de Modélisation des Systèmes Géologiques et Hydrologiques (GEOMODELE), LR16ES17, Faculté des Sciences de SfaxUniversity of SfaxSfaxTunisia
  2. 2.Laboratoire de Radio-Analyses et Environnement, Ecole Nationale d’Ingénieurs de SfaxUniversity of SfaxSfaxTunisia

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