干旱区生态环境知识资源中心(Arid): Depositional model and sequence stratigraphy of the Paleocene-Lower Eocene succession in the Farafra Oasis, Western Desert, Egypt

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DOI	10.1016/j.jafrearsci.2019.103706
	Depositional model and sequence stratigraphy of the Paleocene-Lower Eocene succession in the Farafra Oasis, Western Desert, Egypt
	Wanas, H. A.1,2; Abu Shama, A. M.3; El-Nahrawy, S. A.3
通讯作者	Wanas, H. A.
来源期刊	JOURNAL OF AFRICAN EARTH SCIENCES
ISSN	1464-343X
EISSN	1879-1956
出版年	2020
卷号	162
英文摘要	This work is to reconstruct a depositional model and establish a sequence stratigraphic framework for the exposed Paleocene-Lower Eocene succession in the Farafra Oasis, Western Desert, Egypt. This has been performed by an integration of the microfacies analysis with aid of the nannofossils and P/B foraminiferal ratio in the studied rocks. The identified microfacies and their related palaeoenvironments suggest a deposition in a carbonate shelf (inner, middle and outer shelf) environment. The Paleocene deposits (Dakhla, Tarawan and lower part of Esna formations) were laid down in a mid-to outer-shelf setting, whereas the deposits of Early Eocene age (Farafra Formation and upper part of Esna Formation) were deposited in an inner shelf setting. An integration of the resultant microfacies, nannofossils and P/B foramineferal ratio in the studied four stratigraphic sections led to record five 3rd order depositional sequences (SQs) separated by six sequence boundaries (SBs). Each sequence consists of transgressive (TST) and highstand (HST) systems tracts. The TST consists of a retrogradational package of facies (planktonic foraminiferal wackstones/packstones, as well as shales and marls rich in planktonic foraminifera) ended by marine flooding surface (MFS). The HST is made up of aggradational package of fades (nummulitic bioclastic packstone, algal alveoline packstone, alveoline-miliolid packstone and shale with a relatively low P/B foraminiferal ratio) topped by sequence boundary (SB). The sequence boundaries are distinguished by lithologic and paleontologic criteria. The recognized lithologic criteria comprise calcretes, iron-stained surface, extensive bioturbation and erosional irregular surfaces. The paleontologic criteria are evidenced by the time gaps (hiatus). The maximum flooding surfaces are recognized where there are a relatively high P/B foraminiferal ratio in the studied fades. The integrated results suggest that sedimentation regime of the studied Paleocene-Lower Eocene rocks was mainly controlled by tectonic activities and subsequent sea-level changes that were a result of a reactivation of the Syrian Arc System during Early Paleogene time.
英文关键词	Depositional environments Sequence stratigraphy Paleocene-Early Eocene Farafra Oasis Egypt
类型	Article
语种	英语
国家	Saudi Arabia ; Egypt
收录类别	SCI-E
WOS记录号	WOS:000509618000011
WOS关键词	LARGER BENTHIC FORAMINIFERA ; PALUSTRINE CARBONATES ; FACIES ANALYSIS ; EASTERN DESERT ; BIOSTRATIGRAPHY ; ENVIRONMENTS ; PLATFORM ; RAMP ; LITHOSTRATIGRAPHY ; MICROFACIES
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
EI主题词	2020-02-01
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/312727
作者单位	1.King Abdulaziz Univ, Fac Earth Sci, Dept Petr Geol & Sedimentol, Jeddah, Saudi Arabia; 2.Menoufiya Univ, Fac Sci, Geol Dept, Shibin Al Kawm, Egypt; 3.Kafrelsheikh Univ, Fac Sci, Geol Dept, Kafr Al Sheikh, Egypt
推荐引用方式 GB/T 7714	Wanas, H. A.,Abu Shama, A. M.,El-Nahrawy, S. A.. Depositional model and sequence stratigraphy of the Paleocene-Lower Eocene succession in the Farafra Oasis, Western Desert, Egypt[J],2020,162.
APA	Wanas, H. A.,Abu Shama, A. M.,&El-Nahrawy, S. A..(2020).Depositional model and sequence stratigraphy of the Paleocene-Lower Eocene succession in the Farafra Oasis, Western Desert, Egypt.JOURNAL OF AFRICAN EARTH SCIENCES,162.
MLA	Wanas, H. A.,et al."Depositional model and sequence stratigraphy of the Paleocene-Lower Eocene succession in the Farafra Oasis, Western Desert, Egypt".JOURNAL OF AFRICAN EARTH SCIENCES 162(2020).