Geochemical, mineralogical records, and statistical approaches in establishing sedimentary in the environment of a Mediterranean coastal system: case of Sebkha El-Guettiate (southeastern Tunisia).

Autor: Bouabid N; Higher Institute of Water Sciences and Techniques of Gabès (ISSTEG), University of Gabès, Gabès, Tunisia. bouabidnajia@yahoo.fr.; Research Laboratory Geo-Systems, Geo-Resources, Geo-Environment (LR3G), Department of Geology, Faculty of Sciences of Gabès, University of Gabès, City Campus Erriadh-Zrig, 6072, Gabès, Tunisia. bouabidnajia@yahoo.fr., Srarfi F; Research Laboratory L3G (LR18ES37), Faculty of Science of Tunis, El Manar University, 1060, Tunis, Tunisia., Mnasri H; Higher Institute of Water Sciences and Techniques of Gabès (ISSTEG), University of Gabès, Gabès, Tunisia.; Research Laboratory Geo-Systems, Geo-Resources, Geo-Environment (LR3G), Department of Geology, Faculty of Sciences of Gabès, University of Gabès, City Campus Erriadh-Zrig, 6072, Gabès, Tunisia., Tagorti MA; Research Laboratory: Minerals Resources and Environment, Department of Geology, Faculty of Sciences of Tunis, University of Tunis El Manar (LR01ES06), Tunis, Tunisia.
Jazyk: angličtina
Zdroj: Environmental monitoring and assessment [Environ Monit Assess] 2024 Mar 26; Vol. 196 (4), pp. 398. Date of Electronic Publication: 2024 Mar 26.
DOI: 10.1007/s10661-024-12523-3
Abstrakt: The current study was conducted within the context of the Holocene era in Sebkha El-Guettiate, located in southeastern Tunisia. The aim was to determine the factors influencing the geochemical and mineralogical composition of sediments and to elucidate the sedimentary characteristics of the Holocene within the Sebkha core. We examined a sediment core extending 100 cm from this Sebkha, subjecting it to comprehensive analysis to uncover its sedimentological, mineralogical, and geochemical properties. Several techniques were employed to strengthen and validate the connections between geochemical and mineralogical analyses, including X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM), and infrared (IR) spectroscopy, among others. Furthermore, statistical analyses utilizing principal component analysis (PCA) were applied to the results of the geochemical and mineralogical studies, aiding in the identification of patterns and relationships. A comprehensive mineralogical assessment of the core's sediments revealed the presence and interpretation of carbonate minerals, evaporite minerals, and detrital minerals. Through the application of infrared (IR) spectrometer techniques to all sediment samples, we gained insight into the mineralogical components and the distribution of key elements such as quartz, kaolinite, calcite, feldspar, and organic carbon. The geochemical composition demonstrated a clear dominance of silica (SiO2), accompanied by fluctuations in carbonate percentages (CaCO3). The prominent major elements, primarily magnesium (Mg) and calcium (Ca) originating from dolomitization, sodium (Na) and chlorine (Cl) from halite, and calcium (Ca) from gypsum, exhibited varying levels. Results from Rock-Eval 6 pyrolysis indicated that the organic matter within the sediments is generally a mixture of terrestrial and aquatic origins. This study provides practical information that underscores the diverse origins contributing to Sebkha sediment formation, often influenced by saline systems.
(© 2024. The Author(s), under exclusive licence to Springer Nature Switzerland AG.)
Databáze: MEDLINE
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