Eocene planktonic foraminifera from the north Eastern Desert, Egypt: Biostratigraphic, paleoenvironmental and sequence stratigraphy implications

IF 2 4区地球科学 Q1 Earth and Planetary Sciences

Palaeontologia Electronica Pub Date : 2021-03-22 DOI:10.26879/1088

Y. Salama, M. Sayed, Shaban G. Saber, Ibrahim M. Abd El-Gaied

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引用次数: 5

Abstract

The Eocene succession at Beni Suef -El Zaafarana District in north Eastern Desert is rich in planktonic foraminiferal assemblages. The main objectives of this work are to use the planktonic foraminifera to recognize the biostratigraphy for the Middle-Upper Eocene succession in the study area. Seventy planktonic foraminiferal species belonging to 20 genera and seven families are identified from the Eocene El Fashn and Beni Suef formations. Three planktonic foraminiferal biozones are recognized. These are from older to younger Morozovelloides crassatus Zone (late Middle Eocene) that is recorded from El Fashn Formation, Globigerinatheka semiinvoluta Zone (latest Middle Eocene -Late Eocene) and Globigerinatheka index Zone (Late Eocene age) that are recorded from the Beni Suef Formation while the Maadi Formation is found barren in planktonic foraminifera. These zones are correlated with those from nearby areas in Egypt and the Mediterranean regions. The Middle/Upper Eocene (Bartonian/Priabonian) boundary is discussed here in detail. The percentage of the planktonic foraminifera in the total foraminiferal content (P %) points to a change in water depth. There was a significant decrease in the planktonic/benthic foraminiferal ratio from the late Middle Eocene El Fashn Formation to the Late Eocene Maadi Formation at Beni Suef -El Zaafarana District. This ratio change supports a shallowing upward in paleodepth. Based on the lithology, planktonic/benthic ratio and the obtained water depth, the studied Eocene succession could be subdivided into four depositional sequences. These sequences agree with the global eustatic sea-level and the depositional sequences in nearby areas. Yasser Salama. Geology Department, Faculty of Science, Beni-Suef University, 65211, Egypt. Yasser.salama@science.bsu.edu.eg (Corresponding author) Mostafa Sayed. Geology Department, Faculty of Science, Beni-Suef University, 65211, Egypt. mostafa.sayed92@science.bsu.edu.eg Shaban Saber. Geology Department, Faculty of Science, Beni-Suef University, 65211, Egypt. shaban.saber@science.bsu.edu.eg Ibrahim Abd El-Gaied. Geology Department, Faculty of Science, Beni-Suef University, 65211, Egypt. ibrahim.mohamed@science.bsu.edu.eg SALAMA, ET AL.: EOCENE PLANKTONIC FORAMINIFERA 2

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埃及东北沙漠始新世浮游有孔虫:生物地层学、古环境和层序地层学意义

东北沙漠Beni Suef -El Zaafarana地区始新世演替具有丰富的浮游有孔虫组合。本研究的主要目的是利用浮游有孔虫识别研究区中-上始新统演替的生物地层学。从始新世El Fashn和Beni Suef组中鉴定出70种浮游有孔虫，隶属于7科20属。发现了三个浮游有孔虫生物带。分别为El Fashn组记录的Morozovelloides crassatus带(中始新世晚期)、Beni Suef组记录的globigerinathka semiinvoluta带(中始新世晚期)和globigerinathka指数带(始新世晚期)，而Maadi组浮游有孔虫中发现了裸岩。这些区域与埃及附近地区和地中海地区的区域相关联。本文详细讨论了中、上始新统(巴尔统/普里亚盆统)界线。浮游有孔虫占有孔虫总含量的百分比(P %)表明水深的变化。Beni Suef -El Zaafarana地区中始新世晚期El Fashn组至晚始新世Maadi组浮游/底栖有孔虫比值显著降低。这一比值变化支持古深度呈浅层上升趋势。根据岩性、浮游/底栖比及实测水深，将始新统序列划分为4个沉积层序。这些层序与全球海平面上升和附近地区的沉积层序一致。亚佳。贝尼苏夫大学理学院地质系，埃及65211Yasser.salama@science.bsu.edu.eg(通讯作者)Mostafa Sayed。贝尼苏夫大学理学院地质系，埃及65211mostafa.sayed92@science.bsu.edu.eg沙班军刀。贝尼苏夫大学理学院地质系，埃及65211shaban.saber@science.bsu.edu.eg Ibrahim Abd El-Gaied。贝尼苏夫大学理学院地质系，埃及65211ibrahim.mohamed@science.bsu.edu.eg SALAMA等:始新世浮游有孔虫2

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来源期刊

Palaeontologia Electronica 地学-古生物学

CiteScore

3.60

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Founded in 1997, Palaeontologia Electronica (PE) is the longest running open-access, peer-reviewed electronic journal and covers all aspects of palaeontology. PE uses an external double-blind peer review system for all manuscripts. Copyright of scientific papers is held by one of the three sponsoring professional societies at the author''s choice. Reviews, commentaries, and other material is placed in the public domain. PE papers comply with regulations for taxonomic nomenclature established in the International Code of Zoological Nomenclature and the International Code of Nomenclature for Algae, Fungi, and Plants.