Geological and technological characterization of the Late Jurassic-Early Cretaceous clay deposits (Jebel Ammar, northeastern Tunisia) for ceramic industry

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Journal of African Earth Sciences, ISSN: 1464-343X, Vol: 129, Page: 282-290

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Moufida Ben M'barek-Jemaï, Ali Sdiri, Imed Ben Salah, Lassaad Ben Aissa, Samir Bouaziz, Joelle Duplay
Elsevier BV
Earth and Planetary Sciences
article description
Late Jurassic-Lower Cretaceous clays of the Jebel Ammar study site were used as raw materials for potential applications in ceramic industry. Physico-chemical characterization of the collected samples was performed using atomic absorption spectroscopy, X-ray diffraction, thermogravimetry and dilatometry (Bugot's curve). Geotechnical study was also undertaken by the assessment of plasticity and liquidity limits. It was found that high concentrations of silica, alumina with SiO 2 /Al 2 O 3 ratio characterized the studied clays; its high amounts of CaO and Fe 2 O 3 in the Late Jurassic clays indicated their calcareous nature. In addition, technological tests indicated moderate to low plasticity values for the Late Jurassic and Lower Cretaceous clays, respectively. Clay fraction (<2 μm) reached 50% of the natural clay in some cases.

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