干旱区生态环境知识资源中心(Arid): Palaeoecological and palaeoenvironmental analyses of Cenomanian-early Turonian macrobenthic faunas from the northern Eastern Desert of Egypt

Arid

DOI	10.1016/j.cretres.2021.104853
	Palaeoecological and palaeoenvironmental analyses of Cenomanian-early Turonian macrobenthic faunas from the northern Eastern Desert of Egypt
	El-Sabbagh, Ahmed M.; Nagm, Emad; Mansour, Ahmed S.; El-Hedeny, Magdy M.; Abdelaal, Abdelaal A.; Mansour, Heba N.; Rashwan, Mohamed A.
通讯作者	El-Sabbagh, AM (corresponding author), Alexandria Univ, Dept Geol, Fac Sci, Alexandria 21568, Egypt.
来源期刊	CRETACEOUS RESEARCH
ISSN	0195-6671
EISSN	1095-998X
出版年	2021
卷号	125
英文摘要	The palaeoecology and palaeoenvironments of the Cenomanian-lower Turonian succession in the northern Eastern Desert of Egypt are interpreted, based on a detailed study of macrofaunal assemblages and sedimentary facies. The abundant molluscs and echinoids of the mixed carbonate-siliciclastic Galala and Abu Qada formations have been studied in three sections with ammonites that provide a well-correlated stratigraphical framework. Three unconformities (two Cenomanian sequence boundaries and a first Turonian one) bound two third-order depositional sequences. Facies development shows a strong relationship to the sequence architecture recognised. In addition, the facies characteristics indi-cate depositional palaeoenvironments ranging from lagoonal to deep subtidal settings on a homoclinal carbonate ramp that was proximally influenced by clastic input. The macrobenthic taxa identified in 51 samples, collected from the sections studied, are grouped into seven assemblages (A-G) that are described and interpreted as remnants of communities. The faunal distribution and trophic structure of most of the assemblages recorded confirm fully oxygenated and euhaline shallow-marine environments with mesotrophic productivity level, i.e., relatively stable and low-stress conditions. The trophic structure of some other assemblages, in contrast, reflects the influence of particular environmental parameters, dissolution of aragonitic shells and/or sample size effects. Environmental parameters controlling the faunal distribution include substrate consistency, bathymetry, water energy, surface-water productivity, rate of sedimentation and oxygen availability. The integrated litho-and biofacies results certify that the sequences were deposited during an interval dominated by different perturbations that resulted in a wide spectrum of depositional features and significant palaeoecological variations. (c) 2021 Elsevier Ltd. All rights reserved.
英文关键词	Microfacies Macrobenthos Palaeoecology Palaeoenvironment Upper Cretaceous Northeast Africa
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000663810600007
WOS关键词	CARBONATE PLATFORM SUCCESSION ; SEQUENCE STRATIGRAPHY ; WADI QENA ; BENTHIC ASSOCIATIONS ; CRETACEOUS AMMONITES ; GALALA FORMATION ; SEA-LEVEL ; MIDDLE ; SEDIMENTS ; BASIN
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/2XILL650/349899
作者单位	[El-Sabbagh, Ahmed M.; Mansour, Ahmed S.; El-Hedeny, Magdy M.; Abdelaal, Abdelaal A.] Alexandria Univ, Dept Geol, Fac Sci, Alexandria 21568, Egypt; [Nagm, Emad] Al Azhar Univ, Dept Geol, Fac Sci, Assiut 71524, Egypt; [Nagm, Emad] Taibah Univ, Dept Geol, Coll Sci, Madinah 41477, Saudi Arabia; [Mansour, Heba N.; Rashwan, Mohamed A.] Alexandria Univ, Dept Biol & Geol, Fac Educ, Alexandria 14037, Egypt
推荐引用方式 GB/T 7714	El-Sabbagh, Ahmed M.,Nagm, Emad,Mansour, Ahmed S.,et al. Palaeoecological and palaeoenvironmental analyses of Cenomanian-early Turonian macrobenthic faunas from the northern Eastern Desert of Egypt[J],2021,125.
APA	El-Sabbagh, Ahmed M..,Nagm, Emad.,Mansour, Ahmed S..,El-Hedeny, Magdy M..,Abdelaal, Abdelaal A..,...&Rashwan, Mohamed A..(2021).Palaeoecological and palaeoenvironmental analyses of Cenomanian-early Turonian macrobenthic faunas from the northern Eastern Desert of Egypt.CRETACEOUS RESEARCH,125.
MLA	El-Sabbagh, Ahmed M.,et al."Palaeoecological and palaeoenvironmental analyses of Cenomanian-early Turonian macrobenthic faunas from the northern Eastern Desert of Egypt".CRETACEOUS RESEARCH 125(2021).