Journal de télédétection et SIG

Abstrait

Geochemical Variability and Spectral Analysis of a Core from the El-Guettiate Sebkha in the Mediterranean Saline System during the Holocene

Najia Bouabid*, Feyda Srarfi, Mohamed Ali Tagorti

The aim of this research is to examine the regularity of physico-chemical variables, magnetic susceptibility and carbonate levels on a 100 cm core from the El-Guettiate sebkha in the Skhira region (south-east Tunisia). Spectral analysis of the parameters studied revealed numerous cycles. The variation in CaCO₃ concentration along the core shows significant variability. This variability is due to a radical change in the geochemistry and composition of the sediments as a result of changing climatic conditions. Spectral analysis results in this work can be performed by magnetic susceptibility and sodium shows a cycle of 1000 years and 1300 years. Significant cycles were not identified through spectral analysis of the potassium data. Also carbonate and calcium showed double cycles of 1600 years to 860 years and 1700 years to 889 years. Climate cycle factors are related to solar activity, ocean and atmosphere.