Les dépôts carbonatés continentaux de la région de Hajeb El Ayoun (Tunisie centrale) : implications paléoenvironnementales et morphologiques

In central Tunisia, Quaternary continental carbonate accumulations of lacustrine and/or palustrine types are well developed. The Hajeb El Ayoun basin provides a good example to study these deposits. Petrographic and mineralogical investigations show three facies: 1/ lacustrine limestones with broken...

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Bibliographic Details
Published inPhysio-géo Vol. 13; pp. 133 - 153
Main Authors Faouzia Tlili, Kamel Regaya
Format Journal Article
LanguageEnglish
Published Physio-Géo
Subjects
calcareous crust
climate
lacustrine limestone
Paleoenvironment
palustrine limestone
Tunisia
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Summary:In central Tunisia, Quaternary continental carbonate accumulations of lacustrine and/or palustrine types are well developed. The Hajeb El Ayoun basin provides a good example to study these deposits. Petrographic and mineralogical investigations show three facies: 1/ lacustrine limestones with broken lamellibranches and gastropods tests, 2/ palustrine limestones, which are marked by an important subaerial exposition as indicated by microkarsts and desiccation cracks, and 3/ calcareous crust with pedogenetic features such as glaebules in loose deposits. Palygorskite is most often largely dominant among the clay minerals of silty and calcareous deposits, indicating a confined lake environment for lower materials and arid to semi-arid climatic conditions for those above the lacustrine and/or palustrine limestones.
ISSN:1958-573X
DOI:10.4000/physio-geo.8316