Contribution to the sedimentology of the Messinian carbonates of the Chelif Basin (Boukadir, Algeria)

IF 1.2 4区 地球科学 Q2 GEOLOGY Geologica Belgica Pub Date : 2021-08-30 DOI:10.20341/gb.2021.002
Meriem L. Moulana, A. Hubert‐Ferrari, M. Guendouz, M. El Ouahabi, A. Boutaleb, F. Boulvain
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引用次数: 1

Abstract

The Messinian (Upper Miocene) is characterized at the level of its marginal basins by the development of numerous carbonate platforms. This study concerns the Messinian platform of the Boukadir region in the south of the Chelif Basin in Algeria. It is composed of a lower prograding rimmed platform and an upper aggradational homoclinal ramp resting upon the Tortonian–Lower Messinian Blue Marl Formation, and its thickness reaches ~280 m in the Chelif Basin. The upper red-algae unit is uniform and subhorizontal with a minimum thickness of 90 m. Petrographic analysis of the upper ramp reveals three different microfacies, characterized by Lithothamnium, foraminifera, high porosity, and a microsparitic matrix. MF1 is a packstone, MF2 a packstone/bindstone deposited above the fair-weather wave base and MF3 is a wackestone to packstone deposited below this level. The upper unit is made up entirely of autochthonous biogenic elements without significant external fluvial contribution. It was formed in a shallow marine environment, with very high productivity and a significant export of the sediments produced. This aggradation was followed by a rapid exhumation (regression) transforming all the aragonite into calcite. The platforms correspond to the T2 complex reef formation (6.7–5.95 Ma) documented on the other Messinian carbonate platforms in the South of the Alboran Sea that formed just before the Messinian Salinity Crisis.
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对Chelif盆地(Boukadir,阿尔及利亚)迈西尼亚碳酸盐沉积学的贡献
迈西inian(上中新世)在其边缘盆地的水平上发育了大量的碳酸盐岩台地。本研究涉及阿尔及利亚Chelif盆地南部Boukadir地区的墨西尼亚地台。在切里夫盆地,其厚度可达~280 m,由一个下进积的边缘台地和一个上积的同斜斜坡组成,位于托尔顿—下墨西尼亚蓝泥沼组之上。上层红藻单元均匀且亚水平,最小厚度为90 m。上斜坡岩相分析显示出以石岩、有孔虫、高孔隙度和微颗粒为特征的3种不同微相。MF1为包覆岩,MF2为包覆岩/粘结岩,MF3为包覆岩/粘结岩。上部单元完全由本地生物元素组成,没有明显的外部河流贡献。它是在浅海环境中形成的,生产力非常高,产生的沉积物大量出口。这种沉积之后是快速挖掘(回归),将所有文石转化为方解石。这些台地与阿尔伯兰海南部其他墨西尼亚碳酸盐岩台地上记录的T2复礁组(6.7-5.95 Ma)相对应,这些台地形成于墨西尼亚盐危机之前。
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来源期刊
Geologica Belgica
Geologica Belgica 地学-地质学
CiteScore
4.70
自引率
27.80%
发文量
8
审稿时长
>12 weeks
期刊介绍: Geologica Belgica is a Belgian journal that welcomes papers concerning all aspects of the earth sciences, with a particular emphasis on the regional geology of Belgium, North West Europe and central Africa. Papers not dedicated to the geology of Belgium, North West Europe and central Africa are only accepted when one of the authors is linked to a Belgian University or Institution. Thematic issues are highly appreciated. In this case, guest editors take in charge the selection of the manuscripts and the subject of the papers can be enlarged. The journal is in open access. Submitted manuscripts should be concise, presenting material not previously published. The journal also encourages the publication of papers from Belgian junior authors. Short letters are accepted. Papers written in English are preferred. Each mansucript will be reviewed by at least two reviewers.
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