大西洋中部被动边缘下白垩世河道至浅海沉积的沉积学和地层学:摩洛哥 Aaiun-Tarfaya 盆地

IF 2.2 4区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of African Earth Sciences Pub Date : 2024-08-09 DOI:10.1016/j.jafrearsci.2024.105380
Angel Arantegui , Rhodri Jerrett, J. Lovell-Kennedy , Luc Bulot , Remi Charton , Jonathan Redfern
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引用次数: 0

摘要

本文首次对位于摩洛哥(西北非)的阿尤恩-塔尔法亚盆地北部进行了基于露头的区域沉积学综合研究。下白垩统坦坦地层被细分为六个新成员,并被置于一个包含两个不完整沉积序列的层序地层框架中。各个岩层单位从北到南的厚度变化很大,这表明沉积过程中存在不同的沉降和/或在该层序所叠加的基底不整合面上存在主要地形。这些结果为了解西反阿特拉斯地区的局部构造时间及其对沉积系统演化的控制提供了宝贵的信息。据解释,这六个单元中每一个单元的沉积都是白垩纪早期海平面总体上升、西反阿特拉斯和雷吉巴特盾构运动控制的沉积物输送以及盆地不同时期沉降之间复杂相互作用的结果。研究结果记录了在被动边缘阶段注入中大西洋的以波浪为主的后步式系统的演化过程。改进后的岩相和沉积模型以及对三角洲演变的进一步了解,对探索近海深水等效区域具有重要意义。
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Sedimentology and stratigraphy of lower Cretaceous fluvial to shallow marine deposits on the central Atlantic passive margin: The Aaiun-Tarfaya Basin, Morocco

This paper presents the first integrated regional outcrop-based sedimentological study of the northern Aaiun-Tarfaya Basin located in Morocco (NW Africa). The Lower Cretaceous Tan-Tan Formation has been subdivided into six new members and placed within a sequence stratigraphic framework that includes two incomplete depositional sequences. Strong thickness variations of individual lithostratigraphic units from north to south suggest differential subsidence during sedimentation and/or the existence of major topography on the basal unconformity that the succession onlaps. The results provide valuable insights into the timing of local tectonics in the Western Anti-Atlas and the control on the evolution of the sedimentary system. Deposition of each of these six units is interpreted to be the result of a complex interplay between an overall eustatic sea-level rise during the early Cretaceous, sediment delivery controlled by tectonic movements in the Western Anti-Atlas and Reguibat Shield and periods of differential subsidence in the basin. The results document the style of evolution of a back-stepping wave-dominated system feeding into the Central Atlantic during the passive margin phase. The improved facies and depositional models together with improved understanding of the evolution of the delta have significant implication for exploring the deep-water equivalents offshore.

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来源期刊
Journal of African Earth Sciences
Journal of African Earth Sciences 地学-地球科学综合
CiteScore
4.70
自引率
4.30%
发文量
240
审稿时长
12 months
期刊介绍: The Journal of African Earth Sciences sees itself as the prime geological journal for all aspects of the Earth Sciences about the African plate. Papers dealing with peripheral areas are welcome if they demonstrate a tight link with Africa. The Journal publishes high quality, peer-reviewed scientific papers. It is devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be considered. Papers must have international appeal and should present work of more regional than local significance and dealing with well identified and justified scientific questions. Specialised technical papers, analytical or exploration reports must be avoided. Papers on applied geology should preferably be linked to such core disciplines and must be addressed to a more general geoscientific audience.
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