干旱区生态环境知识资源中心(Arid): Calcareous Nannofossil Biostratigraphy of the Paleocene-Lower Eocene Successions in the Farafra Oasis, Western Desert, Egypt

Arid

DOI	10.1016/j.jafrearsci.2018.09.021
	Calcareous Nannofossil Biostratigraphy of the Paleocene-Lower Eocene Successions in the Farafra Oasis, Western Desert, Egypt
	Abu Shama, A. M.1; Wanas, H. A.2; El-Nahrawy, S. A.1
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	2019
卷号	150 页码:466-484
英文摘要	This work deals with a high-resolution analysis of calcareous nannofossil in four exposed Paleocene-Lower Eocene successions in the Farafra Oasis, Western Desert, Egypt in order to detect the different types of stage boundaries and hiatuses. The studied four sections were collected from five localities (Gebel North Gunna, Gebel South Gunna, Ain Ramla, El-Quss Abu Said and Bir Karawin). In the study area, the Paleocene-Lower Eocene succession is made up of four formations, namely Dakhla (at base), Tarawan, Esna and Farafra (at top) that unconformably overlie the Maastrichtian Khoman Formation. The oldest Paleocene calcareous nannofossil Zone (NP 4) is recorded in the Dakhla Formation. It unconformably overlies the latest Maastrichtian Micula prinsii (CC 26b) subzone that is recognized in the uppermost part of the Khoman Formation at North Gunna section. Although Zone NP 4 is successively overlain by the Paleocene-Lower Eocene calcareous nannofossil zones NP 5, NP 6, NP 7/8, NP 9a, NP 9b, NP 10a. These zones are not sequentially recorded in all the studied sections. The Danian/Selandian boundary is traced in the uppermost part of Zone NP 4 at North Gunna and South Gunna sections. At this boundary, a minor hiatus is observed. This is in consistence with the global drop in relative sea level during the Late Danian. A pronounced hiatus is founded slightly after the base of Selandian to the base of the Thanetian at North Gunna and South Gunna sections. In contrast, in the western part of the studied area at Ain Ramla-ElQuss Abu Said section, a conformable relation is recorded at the Selandian/ Thanetian boundary where the uppermost part of Zone NP 4 is directly followed by Zones NP 5, NP 6 and NP 7/ 8. A hiatus between the Paleocene and the Eocene (Thanetian/Ypresian boundary) is observed in the lower part of the Esna Formation at North Gunna section. The nature of the Paleocene/Eocene boundary is not recognized in Ain Ramla-ElQuss Abu Said and South Gunna sections because they are described as composite sections. However, the Ypresian NP 9b subzone is recorded at the base of South Gunna section. Subzone NP 10a is recorded in all the studied sections, which may a response to a relative sea level rise during the Early Eocene time.
英文关键词	Nannofossil Paleocene-Eocene Farafra oasis Western desert Egypt
类型	Article
语种	英语
国家	Egypt
收录类别	SCI-E
WOS记录号	WOS:000460195100035
WOS关键词	DANIAN-SELANDIAN TRANSITION ; DANIAN/SELANDIAN BOUNDARY ; THERMAL MAXIMUM ; CLAY MINERALOGY ; STRATOTYPE SECTIONS ; MIDDLE PALEOCENE ; DAKHLA FORMATION ; QREIYA SECTION ; EASTERN DESERT ; CENTRAL SINAI
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216600
作者单位	1.Kafrelsheikh Univ, Geol Dept, Fac Sci, Kafr Al Sheikh, Egypt; 2.Menoufia Univ, Fac Sci, Geol Dept, Shibin Al Kawm, Menofia Governo, Egypt
推荐引用方式 GB/T 7714	Abu Shama, A. M.,Wanas, H. A.,El-Nahrawy, S. A.. Calcareous Nannofossil Biostratigraphy of the Paleocene-Lower Eocene Successions in the Farafra Oasis, Western Desert, Egypt[J],2019,150:466-484.
APA	Abu Shama, A. M.,Wanas, H. A.,&El-Nahrawy, S. A..(2019).Calcareous Nannofossil Biostratigraphy of the Paleocene-Lower Eocene Successions in the Farafra Oasis, Western Desert, Egypt.JOURNAL OF AFRICAN EARTH SCIENCES,150,466-484.
MLA	Abu Shama, A. M.,et al."Calcareous Nannofossil Biostratigraphy of the Paleocene-Lower Eocene Successions in the Farafra Oasis, Western Desert, Egypt".JOURNAL OF AFRICAN EARTH SCIENCES 150(2019):466-484.