Structural control on a Ypresian karstic aquifer revealed by an integrated geophysical and geological approach: the Mateur imbricated thrust zone (northern Tunisia)

Author:

Elgattoussi Sourour12ORCID,Melki Fetheddine1ORCID,Gabtni Hakim2ORCID,Booth Rea Guillermo3ORCID

Affiliation:

1. Laboratory of Geodynamics, Geonumeric and Geomatrials (LR18ES37), Department of Geology, Faculty of Sciences of Tunis, University of Tunis El Manar, 1060 Tunis, Tunisia

2. Laboratory of Georesources, Water Research and Technologies Centre (CERTE), BP 273 Borj Cedria, 8020 Soliman, Tunisia

3. Department of Geodynamics, University of Granada, Campus de Fuentenueva s/n, 18071 Granada, Spain

Abstract

We present a characterization of a poorly studied karstic aquifer, documenting the geometry, resistivity properties and the control of structural discontinuities that affect the Ypresian limestone cropping out in the Mateur imbricated thrust zone in northern Tunisia. The karst system was produced by meteoric diagenesis. Geophysical methods and field investigations were useful in extracting geological features. First, our findings suggest that N110–N140 directions are the preferred dissolution paths orientated parallel to strike-slip and extensional faults. Second, the gravity data analysis (regional–residual separation, horizontal gravity gradient and Euler deconvolution) show a particular tectonic node as a junction of the NE–SW and NW–SE directions. Third, 2D electrical resistivity models display various karstification typologies with high (>1000  Ω  m), medium (between 200 and 1000  Ω  m) and low (<100  Ω  m) electrical resistivity zones. These electrical resistivity models have contributed to the establishment of a conceptual structural model of the global karst features. Finally, 2D electrical resistivity tomography (ERT) and 1D time-domain electromagnetic analysis highlighted the presence of potential water zones integrated into the aquifer. Thematic collection: This article is part of the Karst: Characterization, Hazards & Hydrogeology collection available at: https://www.lyellcollection.org/topic/collections/karst

Publisher

Geological Society of London

Subject

Earth and Planetary Sciences (miscellaneous),Geology,Geotechnical Engineering and Engineering Geology

Reference57 articles.

1. Synsedimentary folding process and transtensive tectonic during Late Miocene to Quaternary in northeastern Tunisia: case of Mateur–Menzel Bourguiba region

2. Structural control on karst water circulation and speleogenesis in a lithological contact zone: The Bossea cave system (Western Alps, Italy)

3. Ayadi, M. 1997. Note d'implantation d'un forage de reconnaissance dans la région de Behaya (délégation Mateur). Direction Générale des Ressources en Eau (DGRE), Tunis.

4. Ayadi, M. 2001. Note d'implantation d'un forage de reconnaissance dans la région de Joumine (Tahent, kef Chekak). Direction Générale des Ressources en Eau (DGRE), Tunis.

5. Ayadi, M. 2004. Compte rendu de la fin de travaux du forage Tahent N° IRH 9459/1. Direction Générale des Ressources en Eau (DGRE), Tunis.

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