干旱区生态环境知识资源中心(Arid): Biotic response to the latest Cenomanian drowning and OAE2: A case study from the Eastern Desert of Egypt

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DOI	10.1016/j.pgeola.2020.10.001
	Biotic response to the latest Cenomanian drowning and OAE2: A case study from the Eastern Desert of Egypt
	Nagm, Emad; Jain, Sreepat; Mahfouz, Kamel; El-Sabbagh, Ahmed; Abu Shama, Aziz
通讯作者	Nagm, E (corresponding author), Taibah Univ, Coll Sci, Dept Geol, Madinah 41477, Saudi Arabia.
来源期刊	PROCEEDINGS OF THE GEOLOGISTS ASSOCIATION
ISSN	0016-7878
出版年	2021
卷号	132 期号:1 页码:70-92
英文摘要	The changes in macrofauna and microfauna, before, during and after the latest Cenomanian global Oceanic Anoxic Event (OAE2), from the Eastern Desert of Egypt are documented, along with an inferred paleoenvironment. The age of the studied OAE2 interval is constrained by the last occurrence of the marker calcareous nannofossils species Axopodorhabdus albianus along with the previously identified positive delta C-13 excursion from the coeval ammonite Vascoceras cauvini Zone (= Neocardioceras juddii Zone), enabling correlation with the peak 'b' of the OAE2. Based on the studied microfaunal assemblages, a warm shallow restricted lagoonal environment with mesotrophic conditions and strong seasonality is inferred. The presence of a rare ammonite (and ostracods) attest to the intermittent introduction of marine waters within this inner ramp setting. In terms of sequence stratigraphy, two 3rd order depositional sequences are recorded. The top surface of the first depositional sequence, at the sequence boundary, SB Ce 5 (the start of the OAE2), is marked by an abrupt faunal change with reduced abundances of the macrofaunal elements. This is in tune with other Egyptian records of relatively smaller loss (10 %) at the Cenomanian-Turonian boundary, as compared to much higher numbers (53-79% of species), globally. This faunal (biotic bottleneck) and lithological change (from siliciclastic-dominated deposits to a largely carbonate-dominated one) at the SB Ce 5 is attributed as a response to the latest Cenomanian drowning (the highest sea-level during the Phanerozoic), that also resulted in the formation of carbonate platform. (C) 2020 The Geologists' Association. Published by Elsevier Ltd. All rights reserved.
英文关键词	Cenomanian OAE2 Calcareous nannofossils Benthic foraminifera Ostracods Paleoenvironment
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000695696400007
WOS关键词	OCEANIC ANOXIC EVENT ; CALCAREOUS NANNOFOSSIL BIOSTRATIGRAPHY ; CARBON-ISOTOPE STRATIGRAPHY ; TURONIAN BOUNDARY INTERVAL ; SEA-LEVEL CHANGE ; STABLE-ISOTOPE ; WADI QENA ; SEQUENCE STRATIGRAPHY ; CRETACEOUS AMMONITES ; PLANKTONIC-FORAMINIFERA
WOS类目	Geology ; Paleontology
WOS研究方向	Geology ; Paleontology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/364414
作者单位	[Nagm, Emad] Taibah Univ, Coll Sci, Dept Geol, Madinah 41477, Saudi Arabia; [Nagm, Emad; Mahfouz, Kamel] Al Azhar Univ, Fac Sci, Dept Geol, Assiut 71524, Egypt; [Jain, Sreepat] Adama Sci & Technol Univ, Sch Appl Nat Sci, Dept Geol, Adama, Oromia, Ethiopia; [El-Sabbagh, Ahmed] Alexandria Univ, Fac Sci, Dept Geol, Alexandria 21568, Egypt; [Abu Shama, Aziz] Kafrelsheikh Univ, Fac Sci, Dept Geol, Kafrelsheikh, Egypt
推荐引用方式 GB/T 7714	Nagm, Emad,Jain, Sreepat,Mahfouz, Kamel,et al. Biotic response to the latest Cenomanian drowning and OAE2: A case study from the Eastern Desert of Egypt[J],2021,132(1):70-92.
APA	Nagm, Emad,Jain, Sreepat,Mahfouz, Kamel,El-Sabbagh, Ahmed,&Abu Shama, Aziz.(2021).Biotic response to the latest Cenomanian drowning and OAE2: A case study from the Eastern Desert of Egypt.PROCEEDINGS OF THE GEOLOGISTS ASSOCIATION,132(1),70-92.
MLA	Nagm, Emad,et al."Biotic response to the latest Cenomanian drowning and OAE2: A case study from the Eastern Desert of Egypt".PROCEEDINGS OF THE GEOLOGISTS ASSOCIATION 132.1(2021):70-92.