Detailed gravity measurements integrated with geological data were computed to constrain the mech... more 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.
L’étude des données gravimétriques relatives á la région de Nebeur conduit á une meilleure compré... more L’étude des données gravimétriques relatives á la région de Nebeur conduit á une meilleure compréhension de l’organisation de ses structures profondes. Pour cela l’anomalie de Bouguer a subi différents types de traitements: calcul de prolongements, de résiduelles, et de dérivées selon différentes directions. La combinaison des différents résultats issus de l’interprétation des cartes gravimétriques et des données de la géologie de surface conduit á définir des directions et des structures majeures pour la région. Plusieurs directions ont été confirmées et d’autres ont été mises en évidence, notamment, un fossé d’effondrement de direction NO–SE au niveau de la zone de l’Oued Tessa- Bled el Ghorfa. Ce résultat constitue une extension vers le Nord de la zone des fossés décrite au niveau des affleurements. Gravity data were analysed in the Nebeur area to better understand the organization of its underlying structures. Analysis of the gravity data included the computation of a complete Bouguer anomaly, upward continuations, as well as residual and derivative maps. Comparison of gravity maps, geological and structural maps allows the identification of major structural directions and trends of the study area. It confirms some structural elements gathered from outcrops and defines new ones. In particular, the Oued Tessa – Bled el Ghorfa area that is characterized by a negative gravity anomaly, corresponds to a collapsed structure limited by two NW–SE fault systems. This result extends to north the graben zone that is described from outcrops.
Detailed gravity measurements integrated with geological data were computed to constrain the mech... more 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.
L’étude des données gravimétriques relatives á la région de Nebeur conduit á une meilleure compré... more L’étude des données gravimétriques relatives á la région de Nebeur conduit á une meilleure compréhension de l’organisation de ses structures profondes. Pour cela l’anomalie de Bouguer a subi différents types de traitements: calcul de prolongements, de résiduelles, et de dérivées selon différentes directions. La combinaison des différents résultats issus de l’interprétation des cartes gravimétriques et des données de la géologie de surface conduit á définir des directions et des structures majeures pour la région. Plusieurs directions ont été confirmées et d’autres ont été mises en évidence, notamment, un fossé d’effondrement de direction NO–SE au niveau de la zone de l’Oued Tessa- Bled el Ghorfa. Ce résultat constitue une extension vers le Nord de la zone des fossés décrite au niveau des affleurements. Gravity data were analysed in the Nebeur area to better understand the organization of its underlying structures. Analysis of the gravity data included the computation of a complete Bouguer anomaly, upward continuations, as well as residual and derivative maps. Comparison of gravity maps, geological and structural maps allows the identification of major structural directions and trends of the study area. It confirms some structural elements gathered from outcrops and defines new ones. In particular, the Oued Tessa – Bled el Ghorfa area that is characterized by a negative gravity anomaly, corresponds to a collapsed structure limited by two NW–SE fault systems. This result extends to north the graben zone that is described from outcrops.
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