Deep structure and crustal configuration of the Jeffara basin (Southern Tunisia) based on regional gravity, seismic reflection and borehole data: How to explain a gravity maximum within a large sedimentary basin?

被引：52
|
作者：
Gabtni, H. [1 ]
Jallouli, C. [2 ]
Mickus, K. L. [3 ]
Zouari, H. [4 ]
Turki, M. M. [2 ]
机构：
[1] Univ Gafsa, Fac Sci Gafsa, Dept Geol, Gafsa 2112, Tunisia
[2] Univ Tunis El Manar, Fac Sci Tunis, Dept Geol, Manar 2029 2, Tunisia
[3] Missouri State Univ, Dept Geosci, Springfield, MO 65897 USA
[4] Ctr Rech & Technol Eaux, Lab Georesources, Soliman 8020, Tunisia
来源：
JOURNAL OF GEODYNAMICS | 2009年 / 47卷 / 2-3期
关键词：
Tunisia; Jeffara; Sedimentary basin; Gravity anomalies; Modelling; EXTENSION; EVOLUTION; BOUNDARY; LOCATION;
D O I：
10.1016/j.jog.2008.07.004
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
The Jeffara basin of southern Tunisia contains a thick sequence of mainly Triassic and Permian sediments that is characterized by a gravity maximum. To explain the positive gravity signature over the Jeffara sedimentary basin and to obtain a more quantitative representation of the subsurface structure, a regional 2.5D gravity model constrained by seismic reflection and borehole data was constructed along a NE-SW trending profile. The depth to the crust/mantle implies that the Jeffara basin is associated with crustal thinning. The gravity model also implies that subsidence is controlled by a basement stepped down by relatively low-displacement faulting. This sedimentary subsidence, as described by a listric-faulting model, is probably caused by a thinned crust. (c) 2008 Elsevier Ltd. All rights reserved.
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页码：142 / 152
页数：11
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