Advanced interpretation of gravity data for determining the structural framework: case of Fkirine and Djebibina area (tr
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AGIC 2017
Advanced interpretation of gravity data for determining the structural framework: case of Fkirine and Djebibina area (transition between central Tunisian Atlas and Sahel domain, North Africa) H. Mouakhar 1,2 & H. Gabtni 1 & A. Bel Kahla 3 Received: 29 March 2018 / Accepted: 11 January 2019 # Saudi Society for Geosciences 2019
Abstract The transitional zone between the Atlas Province and the Sahel domain has shown several structural complexities. In order to better understand the structural framework of this zone, a gravity study has been carried out based on a qualitative and quantitative interpretation of gravity data. This study area (Fkirine and Djebibina maps) has indicated that four major tectonic directions underlay the area. We denote NE-SW, NW-SE, E-W, and N-S fault directions. The E-W and N-S strike-slip faults have played a major role in the structuration of the Sahel domain. The depth of E-W faults exceeds 5 km, which explain their deep role in the area structuration. The major thrust front of Zaghouan has been shown as a discontinuous line, due to the change of the tectonic stress field from the Upper Miocene until the Plio-Quaternary. The change of the compression regime direction from NW-SE to N-S during the Plio-Quaternary induced a transtensional movement in Fkirine and Djebibina area that created new depressive structures as Draa Ben Jouder Graben. Applying the gravity method in this area has emerged several information, which are used to better understand the architecture of the region and the impact of faults in the geodynamic evolution. Keywords Gravity . Qualitative and quantitative . Structural . Draa Ben Jouder Graben . Atlas . Sahel
Introduction The potential field methods as the gravity become increasingly an important tool to decipher the structural complexities. The advanced interpretation of gravity data shows relevant results in the complex areas. Many scientific works proved
This article is part of the Topical Collection on Geology of North Africa and Mediterranean Regions * H. Mouakhar [email protected] * H. Gabtni [email protected] * A. Bel Kahla [email protected] 1
Laboratoire de Géoressources (LGR), Centre de Recherches et des Technologies des Eaux (CERTE), BP 273, 8020 Soliman, Tunisia
2
Faculty of Sciences of Tunis, University Tunis El Manar, 2092 Manar 2, Tunis, Tunisia
3
DNO, Tunis, Tunisia
the important role of the gravity such as Hsu et al. (1996), which highlighted the geological boundaries and parameters detection using potential field anomalies, from the Okinawa Trough back arc basin to the Ilan Plain, in Taiwan. Miller and Singh (1994) expanded a concept for potential field processing and interpretation, which is the potential field tilt. This concept was used to locate the potential field sources in Eastern Canada. It was used essentially in the complex areas and where we suffer from the lack of data. The determination of the structural framework from the interpretation of gravity data provides important information to better interp
