Tuesday 23 August 2005

G2

PT0016
Evidence of a relationship between geothermic, gravity and crustal structure in the Sahel domain of Tunisia
Chelli, Badia¹
1 Institut National De Recherche Scientifique Et Technique, Tunisia
Author email: bchoulli@yahoo.fr
Gravity data (2000 stations), geothermic records (67 wells) and crustal thickness variations (after Geotraverse EGT85 seismic refraction data) were analyzed to more understand their relationship and the deep crustal structure characteristics of Sahel domain in eastern Tunisia. We can distinguish, from the North to the South two crustal blocks with different gravity and geothermic signatures: the first is the northern part of Sahel domain, characterized by essentially negative gravity anomalies and a geothermic gradient between 28 and 32°C/km; the second is the Kerkennah-Agareb high, characterized by essentially positive gravity anomalies and a geothermic gradient between 32 and 40°C/km. The cretaceous volcanism recognized in the wells located in the northern edge of the Kerkennah-Sfax high defines a deep differentiation of this block. The construction of the gravity, geothermic gradient and crustal thickness variation along a N-S regional profile confirm the relationship between gravity and geothermic variations.

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