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Clay Material of an Eocene Deposit (Khanguet Rheouis, Tunisia): Identification Using Geochemical and Mineralogical Characterization

Published online by Cambridge University Press:  01 January 2024

Fathi Allouche ,
Mabrouk Eloussaief ,
Sana Ghrab  and
Nejib Kallel
Fathi Allouche
Affiliation:
Laboratoire Géoressources, Matériaux, Environnements et Changements Globaux, LR13ES23, Faculté des Sciences de Sfax, Université de Sfax, BP1171, Sfax 3000, Tunisie
Mabrouk Eloussaief*
Affiliation:
Laboratoire de Recherche ‘Eau, Energie et Environnement’ (LR3E, code LR99ES35), Ecole Nationale d’Ingénieurs de Sfax, Université de Sfax, BP W, 3038 Sfax, Tunisie
Sana Ghrab
Affiliation:
Laboratoire de Recherche ‘Eau, Energie et Environnement’ (LR3E, code LR99ES35), Ecole Nationale d’Ingénieurs de Sfax, Université de Sfax, BP W, 3038 Sfax, Tunisie
Nejib Kallel
Affiliation:
Laboratoire Géoressources, Matériaux, Environnements et Changements Globaux, LR13ES23, Faculté des Sciences de Sfax, Université de Sfax, BP1171, Sfax 3000, Tunisie
*
*E-mail address of corresponding author: eloussaiefmabrouk@yahoo.fr
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Abstract

Despite the numerous studies on geomaterials in Tunisia, quite a few clay varieties are not yet well defined. In fact no detailed geological, mineralogical, or geochemical characterizations of Tunisian palygorskite deposits have been carried out to date. The purpose of the present work was to study the continental Eocene clay deposit at the southern end of the Tunisian North axis, between Jebel Rheouis and Jebel Boudinar, to determine its potential as a clay reserve. Nine samples were collected from the Cherahil formation representing the lower, middle, and upper levels. The analytical results obtained using several techniques (chemical analysis, X-ray diffraction, specific surface area measurements, Fourier-Transform infrared spectroscopy, scanning electron microscopy) revealed that palygorskite is the dominant clay mineral. Dolomite and quartz are present as associated minerals. Chemical analysis of sample AR9 showed a smaller potassium content compared to other samples. Sample AR9 consists essentially of dolomite associated with palygorskite and quartz. Other samples (AR5, AR6, and AR7) collected from the same Cherahil formation contained palygorskite as the main phyllosilicate mineral (80%). The important reserve of palygorskite was found in the middle of the Cherahil formation. Dolomite and quartz associated with palygorskite reduced the length and crystallinity of the fibrous clay morphology. Analysis by scanning electron microscopy proved that the crystallinity of palygorskite was less in the lower and upper parts of the Cherahil formation. The central palygorskite deposit may be of interest for pharmaceutical (adsorbent drug) and other applications. The two other levels of Cherahil formation are mineralogically heterogeneous and considered economically less important than the middle level, which is rich in palygorskite.

Keywords

Analytical characterizationCrystallinityEocene clay depositPalygorskite
Type
Article
Information
Clays and Clay Minerals , Volume 68 , Issue 3 , June 2020 , pp. 262 - 272
Copyright
Copyright © Clay Minerals Society 2020

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