埃及西部沙漠Farafra绿洲El Guss Abu Said高原下始新世演替的地层学和古环境研究

IF 0.9 4区地球科学 Q4 PALEONTOLOGY

Journal of Foraminiferal Research Pub Date : 2023-04-01 DOI:10.2113/gsjfr.53.2.109

A. Shreif, Nageh A. Obaidalla, Safia Al Menoufy

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引用次数: 1

摘要

根据海底有孔虫生物相，对El Guss Abu Said高原的下始新世演替进行了研究，以确定沉积的古环境和性质。从岩性上看，该层序由底部的Esna组（页岩）、Nusf组（含少量石灰岩岩架的厚层泥灰岩）和顶部的Farafra组（石灰岩）组成。Esna组是一个外陆架上半深海相，富含浮游和深海底小型有孔虫。Nusf组和Farafra组富含Nummulite和Alveoliids，表明为碳酸盐台地相。三个海底有孔虫生物相，结合岩石单元的岩性，表明渐进的变浅作用，可能与El Guss Abu Said地区始新世早期发生的构造抬升有关。

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Stratigraphic and Paleoenvironmental Studies on the Lower Eocene Succession at El-Guss Abu Said Plateau, Farafra Oasis, Western Desert, Egypt

The Lower Eocene Succession at El-Guss Abu Said Plateau was examined to determine the paleoenvironments and nature of deposition based upon benthic foraminiferal biofacies. Lithostratigraphically, this succession consists of the Esna Formation (shale) at the base, the Nusf Formation (well-bedded marl with occasional limestone ledges), and the Farafra Formation (limestone) at the top. The Esna Formation is an outer shelf-upper bathyal facies rich in planktonic and deeper-dwelling smaller benthic foraminifera. The Nusf Formation and the Farafra Formation are rich in Nummulites and Alveolinids, indicating a carbonate platform facies. Three benthic foraminiferal biofacies, combined with the lithology of the rock units, indicate progressive shoaling, likely associated with tectonic uplift that occurred during the early Eocene in the El-Guss Abu-Said area.

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来源期刊

Journal of Foraminiferal Research 地学-古生物学

CiteScore

2.10

自引率

9.10%

发文量

审稿时长

>12 weeks

期刊介绍： JFR publishes original papers of international interest dealing with the Foraminifera and allied groups of organisms. Review articles are encouraged.