当前位置: X-MOL 学术Tectonics › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Quaternary Seismostratigraphy and Tectonosedimentary Evolution of the North Tunisian Continental Margin
Tectonics ( IF 3.3 ) Pub Date : 2020-10-30 , DOI: 10.1029/2020tc006243
Miquel Camafort 1 , Eulàlia Gràcia 1 , César R. Ranero 1, 2
Affiliation  

Northern Tunisia contains the poorly defined boundary between the Nubia and Eurasian plates. Offshore north Tunisia, the continental margin is interpreted to be part of the North Africa collisional fold and thrust belt system, linking the Maghrebian and the Sicilian‐Apennine chains. The Tunisia margin deforms by a slow NW‐SE trending convergence resulting in a diffuse deformation zone with scarce and scattered seismicity, in contrast to the neighboring regions of north Algeria and north Sicily. The complex recent evolution of this region is poorly known due to the paucity of studies, particularly offshore in the north Tunisian continental margin. Here, we present the seismostratigraphic analysis of the last ~1.8 Ma tectonosedimentary evolution of this area. The seismostratigraphic analysis supports that individual Quaternary depocenters developed syntectonic to faulting and that faulting influenced sedimentation patterns. We identify an abrupt variation in the sediment accumulation rates (SARs) coeval to a change in the strata geometry of the units located near faults at 402 ± 5 ka (mid‐Middle Pleistocene), supporting a change in the rate of faulting associated to contraction tectonics. This change indicates that deformation is controlled by the NW‐SE convergence between Nubia and Eurasia, probably accelerated at the end of extension in the Tyrrhenian back‐arc. Therefore, the current driving mechanism in the Central Mediterranean is possibly lithospheric collision between Nubia and Eurasia.

中文翻译:

突尼斯北部大陆边缘的第四纪地层学和构造运动演化

突尼斯北部地区在努比亚和欧亚板块之间的边界定义不清。在突尼斯北部离岸,大陆边缘被解释为是北非碰撞褶皱和逆冲带系统的一部分,连接了马格里布人和西西里亚-亚平宁链。与北部阿尔及利亚和北西西里岛的邻近地区相比,突尼斯边缘由于缓慢的NW-SE趋势收敛而变形,从而形成了一个分散的变形带,地震活动稀少且分散。由于研究的匮乏,尤其是在突尼斯北部大陆边缘的近海,该地区最近的复杂变化鲜为人知。在这里,我们介绍了该地区最后〜1.8 Ma构造的沉积演化的地层学分析。地震地层学分析表明,单个第四纪沉积中心与断层同构,并且断层影响了沉积模式。我们发现,与位于断层附近402±5 ka(中更新世)的单元的地层几何结构变化同时,沉积物累积速率(SAR)发生了突然变化,这支持了与收缩有关的断层速率的变化。构造学。这种变化表明,变形是由努比亚和欧亚大陆之间的西北向东南收敛控制的,很可能是在第勒尼安弧后伸展的末期加速了。因此,地中海中部目前的驱动机制可能是努比亚和欧亚大陆之间的岩石圈碰撞。我们发现,与位于断层附近402±5 ka(中更新世)的单元的地层几何结构变化同时,沉积物累积速率(SAR)发生了突然变化,这支持了与收缩有关的断层速率的变化。构造学。这种变化表明,变形是由努比亚和欧亚大陆之间的西北向东南收敛控制的,很可能是在第勒尼安弧后伸展的末期加速了。因此,地中海中部目前的驱动机制可能是努比亚和欧亚大陆之间的岩石圈碰撞。我们发现,与位于断层附近402±5 ka(中更新世)的单元的地层几何结构变化同时,沉积物累积速率(SAR)发生了突然变化,这支持了与收缩有关的断层速率的变化。构造学。这种变化表明,变形是由努比亚和欧亚大陆之间的西北向东南收敛控制的,很可能是在第勒尼安弧后伸展的末期加速了。因此,地中海中部目前的驱动机制可能是努比亚和欧亚大陆之间的岩石圈碰撞。这种变化表明,变形是由努比亚和欧亚大陆之间的西北向东南收敛控制的,很可能是在第勒尼安弧后伸展的末期加速了。因此,地中海中部目前的驱动机制可能是努比亚和欧亚大陆之间的岩石圈碰撞。这种变化表明,变形是由努比亚和欧亚大陆之间的西北向东南收敛控制的,很可能是在第勒尼安弧后伸展的末期加速了。因此,地中海中部目前的驱动机制可能是努比亚和欧亚大陆之间的岩石圈碰撞。
更新日期:2020-11-15
down
wechat
bug