Gravity contributions to the understanding of salt tectonics from the Jebel Cheid area (dome zone, Northern Tunisia) |
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| Authors: | Imen Hamdi-Nasr Mohamed Hédi Inoubli Abdelhamid Ben Salem Saïd Tlig Abdelbaki Mansouri |
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| Institution: | UR-GAMM, UniversitéTunis-El Manar, Facultédes Sciences de Tunis, 2092 El Mana, Tunis;, and Office National des Mines, PO Box 215, 1080 Tunis Cedex, Tunis |
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| Abstract: | Detailed gravity measurements integrated with geological data were computed to constrain the mechanisms that were active during the emplacement of the Triassic evaporite-bearing folds of Jebel Cheid from the salt-dome zone in the Atlassic region. The gravity analysis consists in mapping the contrasting gravity responses: complete Bouguer anomaly, residual anomaly and derivative maps; the main results display a positive amplitude gravity anomaly as the response of Triassic evaporite bodies and important NE–SW-trending features at the boundaries between the Triassic outcrops and their enveloping strata. In contrast with gravity calculations of a salt dome structure usually resulting in negative gravity anomaly models, the Jebel Cheid clearly expresses a positive gravity anomaly; furthermore, this result is supported by synthetic gravity interpretation. |
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