Sedimentological and sequence stratigraphy analyses of the syn-rift Triassic series of the Mohammedia–Benslimane–ElGara–Berrechid basin (Moroccan Meseta)

IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Comptes Rendus Geoscience Pub Date : 2021-01-15 DOI:10.5802/crgeos.36
Abdelkrim Afenzar, R. Essamoud
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引用次数: 3

Abstract

Sedimentological analysis has shown that during the syn-rift phase (Upper Triassic) the Mohammedia–Benslimane–ElGara–Berrechid basin (MBEB) is characterized by detrital and evaporite sediment filling. A gradual decrease of palaeoslope over time led to the evolution of paleoenvironments of proximal alluvial fans system to braided rivers and then to an anastomosing system. These environments evolve finally to an alluvial plain associated with a coastal plain where playa lakes, mudflats and lagoons had developed. We have identified fourteen genetic sequences which are included in four progradationalretrogradational minor cycles that are themselves grouped in one major cycle. These cycles are related to the variations of the base level. The dominance of the retrogradation phases giving an asymmetrical appearance to the cycles is related to the predominance of the base level rise. These variations are probably of allocyclic origin: tectonic and probably climatic, in relation with the Tethys and the Atlantic Ocean being opened.
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摩洛哥梅塞塔Mohammedia-Benslimane-ElGara-Berrechid盆地同裂谷三叠系沉积与层序地层学分析
沉积学分析表明,在同裂谷期(上三叠统),Mohammedia-Benslimane-ElGara-Berrechid盆地(MBEB)以碎屑沉积和蒸发岩沉积为主。随着时间的推移,古斜坡逐渐减少,导致近端冲积扇系统的古环境演变为辫状河,再演变为网状系统。这些环境最终演变成与海岸平原相关的冲积平原,在海岸平原上形成了湖泊、泥滩和泻湖。我们已经确定了14个基因序列,这些序列包括在4个递进和倒退的小旋回中,而这些小旋回本身又归为一个大旋回。这些周期与基准面的变化有关。使旋回呈现不对称外观的退退阶段的优势与基准面上升的优势有关。这些变化可能是不同步的起源:与特提斯和大西洋打开有关的构造和气候。
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来源期刊
Comptes Rendus Geoscience
Comptes Rendus Geoscience 地学-地球科学综合
CiteScore
2.80
自引率
14.30%
发文量
68
审稿时长
5.9 weeks
期刊介绍: Created in 1835 by physicist François Arago, then Permanent Secretary, the journal Comptes Rendus de l''Académie des sciences allows researchers to quickly make their work known to the international scientific community. It is divided into seven titles covering the range of scientific research fields: Mathematics, Mechanics, Chemistry, Biology, Geoscience, Physics and Palevol. Each series is led by an editor-in-chief assisted by an editorial committee. Submitted articles are reviewed by two scientists with recognized competence in the field concerned. They can be notes, announcing significant new results, as well as review articles, allowing for a fine-tuning, or even proceedings of symposia and other thematic issues, under the direction of invited editors, French or foreign.
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