New Elements on the Hairech Metamorphic Massif Structure (Northwest Tunisia). Geoelectrical Prospecting Contribution

A geoelectrical survey was carried out in order to better understand the subsurface geology of the metamorphic massif of Hairech (Tunisia). Over 50 Schlumberger electrical soundings were performed using a maximum electrode spacing of 3000 m. The carried out qualitative interpretation of resistivity distributions for various depths is based on apparent resistivity maps that were constructed for different AB spacings.

Quantitatively, the measured resistivity values were one-dimensionally interpreted. The already drilled boreholes and the position of some electrical soundings on geological outcrops have been helpful for electrical data calibration.

The results of the vertical electrical soundings reveal that the metamorphic Hairech massif, correspond to a folded structure which is affected by deep trending east–west to northeast-southwest faults.