干旱区生态环境知识资源中心(Arid): Paleoenvironmental significance of the monospecific biostromes in the Campanian-Maastrichtian Duwi Formation (Eastern Desert, Egypt)

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DOI	10.1016/j.sedgeo.2020.105772
	Paleoenvironmental significance of the monospecific biostromes in the Campanian-Maastrichtian Duwi Formation (Eastern Desert, Egypt)
	Abdelhady, Ahmed A.; Seuss, Barbara; Fursich, Franz T.; Ali, Ahmed; Abdel-Raheem, Khalaf H. M.; Mohamed, Ramadan S. A.
通讯作者	Abdelhady, AA
来源期刊	SEDIMENTARY GEOLOGY
ISSN	0037-0738
EISSN	1879-0968
出版年	2020
卷号	408
英文摘要	The Campanian-Maastrichtian Duwi Formation in the Eastern Desert of Egypt is an economic-rich part of the Middle East phosphorite belt, which has been formed during an extensive high-productivity and anoxic episode in the southern Tethys. To understand the consequences of these environmental conditions on the paleoecosystems, the sediments and the benthic macrofauna was analyzed. Although the macrobenthic elements are poorly represented throughout the studied sections, four monospecific biostromes were recognized. They included two Ambigostrea oyster biostromes, which have developed under high-energy and fully aerated environments above the storm wave-base. In contrast, the heterodont bivalves Miegricardium and Aphrodina biostromes were deposited under mesotrophic, low-energy, and dysoxic regimes. Shell orientation, shell size-frequency, and multivariate analysis of other taphonomic features indicated that one of two Ambigostra biostromes were partially generated by waves andior storms (i.e. parabiostromes), while the other one is mostly in situ (i.e. autoparabiostromes). In contrast, the heterodont biostromes are intrinsic autochthonous concentrations (autobiostromes). The link between occurrences of biostromes and cydicity of deposits suggests a clear association to sea-level fluctuations. The autobiostromes dominating the maximum-flooding and early highstand intervals and were differentiated from the parabiostromes, which formed by physical instead of biologic agents during initial transgressions or late highstand. The palaeo-ecosystem was reconstructed and the environmental factors behind the biostromes were identified; the monospecific nature of the biostromes is interpreted to be a consequence of high-stress environment (e.g., high productivity and associated anoxia). The global climate during the Campanian-Maastrichtian, sea level fluctuations, and physiography influenced salinity and oxygen levels and played the pivotal role in the formation of the monospecific biostromes of the Duwi Formation. (C) 2020 Elsevier B.V. All rights reserved.
英文关键词	Biostromes Monospecific communities Mediterranean phosphorite belt Palaeo-ecosystem Southern Tethys Upper Cretaceous
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000588308500012
WOS关键词	MAGHARA NORTH SINAI ; SHELL BEDS ; SEQUENCE STRATIGRAPHY ; BENTHIC ASSOCIATIONS ; SEDIMENTARY CYCLES ; PALEOECOLOGY ; COMMUNITIES ; EVOLUTION ; ORIGIN ; BASIN
WOS类目	Geology
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/2XILL650/327459
作者单位	[Abdelhady, Ahmed A.; Ali, Ahmed; Abdel-Raheem, Khalaf H. M.; Mohamed, Ramadan S. A.] Menia Univ, Fac Sci, Geol Dept, El Minia 61519, Egypt; [Seuss, Barbara; Fursich, Franz T.] Friedrich Alexander Univ Erlangen Nurnberg, FG PalaoUmwelt, GeoZentrum Nordbayern, Loewenichstr 28, D-91054 Erlangen, Germany
推荐引用方式 GB/T 7714	Abdelhady, Ahmed A.,Seuss, Barbara,Fursich, Franz T.,et al. Paleoenvironmental significance of the monospecific biostromes in the Campanian-Maastrichtian Duwi Formation (Eastern Desert, Egypt)[J],2020,408.
APA	Abdelhady, Ahmed A.,Seuss, Barbara,Fursich, Franz T.,Ali, Ahmed,Abdel-Raheem, Khalaf H. M.,&Mohamed, Ramadan S. A..(2020).Paleoenvironmental significance of the monospecific biostromes in the Campanian-Maastrichtian Duwi Formation (Eastern Desert, Egypt).SEDIMENTARY GEOLOGY,408.
MLA	Abdelhady, Ahmed A.,et al."Paleoenvironmental significance of the monospecific biostromes in the Campanian-Maastrichtian Duwi Formation (Eastern Desert, Egypt)".SEDIMENTARY GEOLOGY 408(2020).