Abstract The Mejerda basin in northwestern Tunisia is located between the Tell and Atlas Mountains and contains structures related to the complicated tectonic history of the study region. The Mejerda contains compressional structures related to the Cenozoic collision between Europe and Africa, and strike-slip faults related to extensional tectonics. As a result of the varied tectonic history, there has been numerous models of the basin formation ranging from simple grabens, pull-apart basins and foreland basins. In order to constrain the subsurface structure of the basin, a gravity analysis consisting of the construction of residual gravity anomaly maps, estimated depths from upward continuation and Euler deconvolution, and detailed two-dimensional forward models. The gravity analysis was constrained by a seismic reflection profile and a deep well. The map analysis indicated two separate basins, one called the Quaternary basin and another called the Pliocene basin. Based on the gravity depth analyses and the gravity forward modeling, and the residual gravity anomaly map, these basins were between 2.5 and 3 km thick, and separated by gravity maxima probably due to uplift of Triassic and Cretaceous sediments related to compressional tectonics and evaporitic movement. The Euler deconvolution analysis imaged a number of lineaments, interpreted to be faults, that trend in the NE and NW directions and these faults basically delineate the basins. Results confirm that the Mejerda basin is a wedge-top basin located in the foreland side of the Tellian thrust belt and consists of two separate basins whose origin was mostly determined by thin-skin compressional tectonics.

中文翻译：

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对突尼斯西北部地区 Mejerda 前陆盆地的重力贡献

摘要 突尼斯西北部的梅杰尔达盆地位于泰尔山脉和阿特拉斯山脉之间，包含与研究区复杂构造历史有关的构造。Mejerda 包含与欧洲和非洲之间的新生代碰撞相关的挤压构造，以及与伸展构造相关的走滑断层。由于构造历史的不同，盆地形成的模型多种多样，包括简单地堑、拉开盆地和前陆盆地。为了约束盆地的地下结构，重力分析包括构建残余重力异常图、向上延续和欧拉反褶积的估计深度以及详细的二维正演模型。重力分析受到地震反射剖面和深井的约束。地图分析表明有两个独立的盆地，一个称为第四纪盆地，另一个称为上新世盆地。根据重力深度分析和重力正演模拟以及残余重力异常图，这些盆地的厚度在 2.5 至 3 公里之间，并且被重力最大值分隔，可能是由于与挤压构造和蒸发运动相关的三叠纪和白垩纪沉积物的抬升. 欧拉反褶积分析成像了许多被解释为断层的线条，NE 和 NW 方向的趋势和这些断层基本上描绘了盆地。结果证实，Mejerda 盆地是一个楔顶盆地，位于 Tellian 逆冲带前陆侧，由两个独立的盆地组成，其起源主要由薄皮挤压构造确定。