干旱区生态环境知识资源中心(Arid): Facies analysis and sequence stratigraphy of the Middle Miocene Marmarica Formation at Siwa area, north Western Desert, Egypt

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DOI	10.1002/gj.4437
	Facies analysis and sequence stratigraphy of the Middle Miocene Marmarica Formation at Siwa area, north Western Desert, Egypt
	Anan, Tarek; Reda, Amina; El-Belasy, Ahmed; El-Shahat, Adam
通讯作者	Anan, T
来源期刊	GEOLOGICAL JOURNAL
ISSN	0072-1050
EISSN	1099-1034
出版年	2022
卷号	57 期号:7 页码:2749-2769
英文摘要	The Middle Miocene rocks in the northern part of the Western Desert of Egypt are dominated by carbonate rocks that constitute the Marmarica Formation. To determine the depositional environments and sequence architecture of the Marmarica Formation, three sections were described and sampled in detail. These sections from west to east are; Girba, Naqb El-Migahhiz, and Gabal Umm Hiyus. The Marmarica Formation in the Siwa area includes three members, from bottom to top: the Oasis, Siwa Escarpment, and El Diffa Plateau members. The microfacies of the Marmarica Formation comprise abundant mud-supported microfacies with minor grain-supported microfacies. Sedimentation during the Middle Miocene took place on a homoclinal ramp. Dolomitization is the most prevalent diagenetic process that affected carbonate sediments of the Marmarica Formation. The Marmarica Formation comprises two sequence boundaries. The first sequence boundary (SB1) is demarcated by the presence of Thalassinoides ichnofacies at the boundary between the Oasis and Siwa Escarpment members in all the studied sections. It is considered a type 1 sequence boundary. The second sequence boundary (SB2) is represented by an erosional surface, which is recorded only in Girba section. The SB2 was traced at both Naqb El-Migahhiz and Umm Hiyus sections by the occurrence of burrows that relate to the Glossifungites ichnofacies. The latter boundary is considered type 2. Three third-order depositional sequences have been recognized in the Middle Miocene Marmarica Formation. Therefore, the Marmarica Formation at Siwa Oasis exhibits relative sea-level oscillation. During the Middle Miocene, the prevailing warm climate caused transgression and deposition of carbonates along the marine shelf surrounding western and northern Africa.
英文关键词	Egypt facies analysis Marmarica Formation sequence stratigraphy Siwa area
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000769372400001
WOS关键词	DIAGENESIS ; OASIS ; BASIN ; EVOLUTION
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/2XILL650/392936
推荐引用方式 GB/T 7714	Anan, Tarek,Reda, Amina,El-Belasy, Ahmed,et al. Facies analysis and sequence stratigraphy of the Middle Miocene Marmarica Formation at Siwa area, north Western Desert, Egypt[J],2022,57(7):2749-2769.
APA	Anan, Tarek,Reda, Amina,El-Belasy, Ahmed,&El-Shahat, Adam.(2022).Facies analysis and sequence stratigraphy of the Middle Miocene Marmarica Formation at Siwa area, north Western Desert, Egypt.GEOLOGICAL JOURNAL,57(7),2749-2769.
MLA	Anan, Tarek,et al."Facies analysis and sequence stratigraphy of the Middle Miocene Marmarica Formation at Siwa area, north Western Desert, Egypt".GEOLOGICAL JOURNAL 57.7(2022):2749-2769.