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Gravity contributions to the understanding of salt tectonics from the Jebel Cheid area (dome zone, Northern Tunisia)
Author(s) -
HamdiNasr Imen,
Hédi Inoubli Mohamed,
Ben Salem Abdelhamid,
Tlig Saïd,
Mansouri Abdelbaki
Publication year - 2009
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.2009.00788.x
Subject(s) - geology , bouguer anomaly , gravity anomaly , salt dome , evaporite , outcrop , tectonics , dome (geology) , extensional fault , anomaly (physics) , gemology , geophysics , paleontology , magnetic anomaly , seismology , extensional definition , volcanism , structural basin , engineering geology , physics , condensed matter physics , oil field
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.