Contribution de la gravimétrie et de la sismique réflexion pour une nouvelle interprétation géodynamique des fossés d'effondrement en Tunisie : exemple du fossé de Grombalia |
| |
| Authors: | Mohamed Hadj Sassi Hédi Zouari Chokri Jallouli |
| |
| Institution: | 1. Laboratoire de géoressources, Centre de recherches et technologies des eaux, BP 273, 8020 Soliman, Tunisie;2. Département de géologie, faculté des sciences de Tunis, campus universitaire, 1060 Tunis, Tunisie |
| |
| Abstract: | Troughs in Tunisia are interpreted as Plio-Quaternary structures associated to normal faults (grabens) or to flexure faults. Gravity data and seismic sections are used in this study to clarify the structure and the geodynamic evolution of an example of trough: the Grombalia trough (northeastern Tunisia), since the Upper Miocene to the Quaternary. A high residual negative gravity anomaly, which reaches ?15 mGal, is interpreted as being related to the thickening of Mio-Plio-Quaternary deposits (and probably older), as illustrated by seismic data. This subsidence has been the result of a negative flower structure related to strike-slip faults that have been reactivated with normal component during the Upper Miocene and with reverse component during the Pliocene. Seismic and gravity data demonstrate that the fault system is rooted, and more than four kilometres deep. The Grombalia example outlines the association between troughs and strike-slip faults; such a system is recognized in Tunisia, in the Ionian Sea and in the Pelagian Sea. To cite this article: M. Hadj Sassi et al., C. R. Geoscience 338 (2006). |
| |
| Keywords: | Fossé Gravimétrie Grombalia Mer Ionienne Mer Pélagienne Sismique réflexion Décrochement Tunisie Trough Gravity Grombalia Ionian Sea Pelagian Sea Seismic data Strike-slip fault Tunisia |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
