气候变化领域集成服务门户(CCPortal): Facies architecture and controlling factors induced depositional model of the Quaternary carbonate eolianites in the northwestern Mediterranean coast of Egypt

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DOI	10.1007/s00531-020-01863-3
	Facies architecture and controlling factors induced depositional model of the Quaternary carbonate eolianites in the northwestern Mediterranean coast of Egypt
	Assal E.M.; Abdel-Fattah Z.A.; El-Asmar H.M.
发表日期	2020
ISSN	14373254
起始页码	1659
结束页码	1682
卷号	109 期号:5
英文摘要	The present paper focuses on the facies and allogenic controlling factors affecting the eolianite depositional system on a semi-arid carbonate ramp. Facies analysis and stratal architecture are integrated with earlier age-dating data to develop a depositional model of the landmark eolianite ridges in the northwestern Egyptian coast. Nine genetically related eolianite units, separated by eight eolianite-bounding surfaces and paleosol/protosol horizons are recognized. Twelve depositional facies belonging to three main facies associations have been identified. The eolianite facies association comprises cross-stratified oolitic and bioclastic grainstones. The inter-eolianite facies association includes paleosols, protocols and calcretes. The intra-eolianite facies association is represented locally by marine boulders of grainstone and rudstone (possibly reworked and imbricated by storm and tsunami waves) in the Coastal and Maryut eolianite ridges. Depositional development of the carbonate eolianites is strongly controlled by the Quaternary paleoclimate and glacio-eustatic sea-level cycles under mild tectonics on a gentle-slope carbonate ramp. The suggested depositional model matches well with the worldwide age-dating data of the carbonate coastal dunes, which generally indicate contemporaneous periods of eolianite deposition. The studied eolianite units are attributed herein to periods of highstand and stillstand, which can be correlated to the Marine Isotope Stages (MIS) of the middle Pleistocene ‘MIS 9 and 7′, the late Pleistocene ‘MIS 5e’ and ‘MIS 5c-5a’, and finally the Holocene ‘MIS 1′. The paleosols were mostly best developed during periods of lowstand. The Holocene immature paleosol ‘Ps1′ represents an example of the generation of protosol/paleosol during a highstand period. This supports the idea that the Pleistocene paleosols may be initiated during wet periods of the highstand and developed later during subsequent lowstand episodes. Collectively, the results imply that the generated eolianites along the carbonate ramp are strongly controlled by glacio-eustasy and paleoclimate, in addition to other autogenic factors in the depositional system. © 2020, Geologische Vereinigung e.V. (GV).
英文关键词	Carbonate eolianites; Depositional model; Egypt; Facies; Quaternary; Southeastern mediterranean coast
语种	英语
scopus关键词	carbonate sediment; coastal zone; depositional sequence; eolian deposit; facies analysis; glacioeustacy; paleoclimate; paleosol; Quaternary; tectonics; Egypt; Mediterranean Coast [Egypt]
来源期刊	International Journal of Earth Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/147665
作者单位	Geology Department, Faculty of Science, Damietta University, New Damietta City, Damietta, 34517, Egypt; Advisor at the Deanship of Admission and Registration, King Saud University, Riyadh, Saudi Arabia
推荐引用方式 GB/T 7714	Assal E.M.,Abdel-Fattah Z.A.,El-Asmar H.M.. Facies architecture and controlling factors induced depositional model of the Quaternary carbonate eolianites in the northwestern Mediterranean coast of Egypt[J],2020,109(5).
APA	Assal E.M.,Abdel-Fattah Z.A.,&El-Asmar H.M..(2020).Facies architecture and controlling factors induced depositional model of the Quaternary carbonate eolianites in the northwestern Mediterranean coast of Egypt.International Journal of Earth Sciences,109(5).
MLA	Assal E.M.,et al."Facies architecture and controlling factors induced depositional model of the Quaternary carbonate eolianites in the northwestern Mediterranean coast of Egypt".International Journal of Earth Sciences 109.5(2020).