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Tectonic evolution and subsidence history of the Cretaceous basins in southern Egypt: The Komombo Basin
Basin Research ( IF 2.8 ) Pub Date : 2022-05-15 , DOI: 10.1111/bre.12683
Moamen Ali 1, 2 , Mohammed Y. Ali 1 , Ahmed Abdelhady 3 , James Derek Fairhead 4
Affiliation  

The structure and tectonic evolution of the Cretaceous rift basins of southern Egypt are poorly understood. In this study, the tectonostratigraphy of the Komombo Basin has been determined using seismic, well and biostratigraphic data. The tectonostratigraphy of the basin is compared to the Kharit, Nuqra and Beni Suef basins in Egypt as well as Muglad Basin in Sudan. The Komombo Basin is a 58 km long, 28 km wide NW–SE trending half-graben infilled with 2200 m of Berriasian-Maastrichtian sediments and overlain by 400 m of Pliocene sediments. Four Berriasian to Maastrichtian syn-rift and post-rift sequences and three Pliocene channel systems of Nile sediments have been identified. Moreover, a series of normal faults, negative flower structures, reverse faults and folds are mapped in the basin. Backstripping reveals two rift phases during the Berriasian-Barremian and Turonian-Santonian, respectively. Additionally, the tectonic subsidence curves indicate that two major unconformities have occurred during the Aptian-Albian and Maastrichtian-Pliocene, which are correlated with a basement uplift during the Albian-Cenomanian and the Oligocene-Miocene flank uplift related to the opening of the Red Sea, respectively. The rift episodes are attributed to far-field stress changes resulting from the initial opening of the South Atlantic and followed by the NW part of the African plate colliding and anticlockwise rotating into Europe. The highest β factors (1.20–1.11) for both rift phases are found at the centre of the basin. The rift phases thinned the crust from 32.5 to 28.2 km and 31.9 km in the depocenter and the western flank of the basin. The Komombo Basin has a similar rift history, stratigraphy and structural style to the Kharit, Nuqra and Mugland basins. All of these basins witnessed two major rift phases in the Early and Late Cretaceous, whereas the Beni Suef Basin encountered strike-slip tectonic events in the Late Cretaceous.

中文翻译:

埃及南部白垩纪盆地的构造演化与沉降史:科蒙波盆地

埃及南部白垩纪裂谷盆地的结构和构造演化知之甚少。在这项研究中,使用地震、井和生物地层数据确定了 Komombo 盆地的构造地层学。该盆地的构造地层与埃及的 Kharit、Nuqra 和 Beni Suef 盆地以及苏丹的 Muglad 盆地进行了比较。Komombo 盆地是一个长 58 公里、宽 28 公里的 NW-SE 走向的半地堑,充满了 2200 米的 Berriasian-Maastrichtian 沉积物和 400 米的上新世沉积物。已经确定了四个 Berriasian 到 Maastrichtian 同裂谷和裂谷后序列以及尼罗河沉积物的三个上新世河道系统。此外,盆地内还绘制了一系列正断层、负花构造、逆断层和褶皱。Backstripping 揭示了分别在 Berriasian-Barremian 和 Turonian-Santonian 的两个裂谷阶段。此外,构造沉降曲线表明,在阿普蒂安-阿尔比和马斯特里赫特-上新世期间出现了两个主要的不整合面,这与阿尔比-森诺曼期的基底隆起和与红海打开有关的渐新世-中新世侧翼隆起有关。 , 分别。裂谷事件归因于南大西洋最初开放导致的远场应力变化,随后非洲板块的西北部分碰撞并逆时针旋转进入欧洲。在盆地中心发现了两个裂谷阶段的最高 β 因子(1.20-1.11)。裂谷期使沉积中心和盆地西侧的地壳从 32.5 公里减薄至 28.2 公里和 31.9 公里。Komombo 盆地具有与 Kharit、Nuqra 和 Mugland 盆地相似的裂谷历史、地层和构造风格。所有这些盆地都在早白垩世和晚白垩世经历了两个主要的裂谷阶段,而贝尼苏夫盆地在晚白垩世经历了走滑构造事件。
更新日期:2022-05-15
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