CYCLICITY OF GRAIN SIZE PARAMETERS ALONG A CORE FROM THE GLEYSOL OF SEBKHA ENNOUAL, SOUTHEASTERN TUNISIA
ELHOUCINE ESSEFI *
National Engineering School of Sfax, Road of Soukra, km 4 Zip code 3038. Sfax, Tunisia and RU: Sedimentary Dynamics and Environment (DSE) (Code 03/UR/10-03), National Engineering School of Sfax, University of Sfax, Tunisia.
NAJOUA GHARSALLI
National Engineering School of Sfax, Road of Soukra, km 4 Zip code 3038. Sfax, Tunisia and RU: Sedimentary Dynamics and Environment (DSE) (Code 03/UR/10-03), National Engineering School of Sfax, University of Sfax, Tunisia.
SONIA SALHI
RU: Sedimentary Dynamics and Environment (DSE) (Code 03/UR/10-03), National Engineering School of Sfax, University of Sfax, Tunisia and Faculty of Sciences of Sfax, Road Soukra, km 3.5, Sfax 3018, Tunisia.
CHOKRI YAICH
National Engineering School of Sfax, Road of Soukra, km 4 Zip code 3038. Sfax, Tunisia and RU: Sedimentary Dynamics and Environment (DSE) (Code 03/UR/10-03), National Engineering School of Sfax, University of Sfax, Tunisia.
*Author to whom correspondence should be addressed.
Abstract
This paper aims to investigate the climatic cycles within the gleysol of sebkha Ennoual. The descriptive grain size distribution (mean, mode, median) visualized two and a half low frequency cycles stretching on 65 cm. Each cycle starts with a dominant vertisol fraction. Then, the arenosol fraction takes the super voice. Simple spectral analysis highlighted the individualization of a 75 cm cycle. The REDFIT spectral analyses numerically showed the appearance of high frequency cycles. Genetically, the middle of the cycles are marked by the appearance of a coarse aeolian arenosol fraction centre (160 µm). From the top downward, the length of the cycles decreases from 53 cm to 20 cm due to an upward increasing aridity. Inspite of solonchaks phenomenon within the gleysol filling of sebkhas Ennoual, kastanozem and phaeozems were quite recorded.Keywords: Gleysol, spectral analysis, cyclostratigraphy, grain size distribution, genetic approach, sebkha Ennoual, Southeast Tunisia