Stratigraphy and sedimentology of the uppermost Albian-lower Turonian of the Morsott area (Algero-Tunisian Atlasic Basin)

IF 2.2 4区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of African Earth Sciences Pub Date : 2024-10-19 DOI:10.1016/j.jafrearsci.2024.105455
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Abstract

The stratigraphical features and palaeoenvironmental conditions of the uppermost Albian-lower Turonian succession of the eastern Algerian Saharan Atlas domain are described for the first time. Two formations have been recognised, called the Ouled Serradj and the Chemla, respectively. Ammonites and calcareous nannofossils enable us to assign the Ouled Serradj Formation to the upper Albian-Cenomanian and the Chemla Formation to the uppermost Cenomanian-lower Turonian. Based on the field data and microfacies studies, the strata of these formations are arranged into eight microfacies types (MT 1 to MT 8) that are described in terms of depositional environments and grouped into three main facies associations (FA-1 to FA-3): FA-1 (MT 1–4), deep-water outer platform marl-dominated facies association 1 with limestone intercalations; FA-2 (MT 5 and 6), mid-platform marl-dominated facies association 2; and FA-3 (MT 7 and 8), mid- and inner platform limestone-marl facies association 3.
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莫尔索特地区(阿尔及利亚-突尼斯阿特拉斯盆地)最上阿尔卑斯统-下图伦统的地层学和沉积学
该研究首次描述了阿尔及利亚撒哈拉阿特拉斯地区东部最上阿尔卑斯-下都伦演替的地层特征和古环境条件。已确认的两个地层分别称为 Ouled Serradj 和 Chemla。鲑鱼和钙质化石使我们能够将 Ouled Serradj 地层归入上阿尔卑斯-仙人掌纪,将 Chemla 地层归入最上仙人掌-下图伦纪。根据实地数据和微地层研究,这些地层被划分为八种微地层类型(MT 1 至 MT 8),这些微地层类型根据沉积环境进行了描述,并分为三个主要地层组合(FA-1 至 FA-3):FA-1(MT 1-4),深水外平台泥灰岩为主、夹石灰岩的岩相组合 1;FA-2(MT 5 和 6),中平台泥灰岩为主的岩相组合 2;FA-3(MT 7 和 8),中、内平台石灰岩-泥灰岩岩相组合 3。
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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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