干旱区生态环境知识资源中心(Arid): The Middle Miocene Microfacies, Cyclicity, and Depositional History: Implications on the Marmarica Formation at the Siwa Oasis, Western Desert (Egypt)

Arid

DOI	10.3390/min14010073
	The Middle Miocene Microfacies, Cyclicity, and Depositional History: Implications on the Marmarica Formation at the Siwa Oasis, Western Desert (Egypt)
	Khalifa, Mohamed A.; Zaky, Amr S.; Jovane, Luigi; El-Hewy, Ahmed M.; Zahran, Esam; Kasem, Atef M.
通讯作者	Zaky, AS
来源期刊	MINERALS
EISSN	2075-163X
出版年	2024
卷号	14 期号:1
英文摘要	Microfacies studies were carried out on the Middle Miocene Marmarica Formation exposed at the Gabal Western Bahi El-Din and Gabal El-Najdeen, the Siwa Oasis, northwestern Desert (Egypt). It was distinguished into the lower, middle, and upper members. Eleven microfacies types were recognized, which include skeletal lime-mudstone, dolomitic lime-mudstone, intraclastic wackestone, bryozoan wackestone, foraminiferal wackestone, foraminiferal bryozoan packstone, glauconitic molluscan packstone, molluscan intraclastic packstone, pelletal peloidal skeletal packstone, dolostones, and claystone microfacies. This formation includes several types of emergence- meter-scale cycles (shallowing-upward). Field observations and petrographic analyses revealed that these cycles consist of pure carbonates and mixed siliciclastic carbonates. These cycles consist of four types of gradual cycles and six types of non-gradual cycles. The gradual emergence cycles indicate a balance between the rate of subsidence, sea level oscillations, and sedimentation rate. The non-gradual cycles indicate an irregular balance between sedimentation rate and subsidence rate. The non-gradual cycles denote high-frequency sea level variation and/or short-term sea level oscillations, which are associated with high carbonate formation. The depositional environments of the Marmarica Formation are restricted to lagoonal at the base, followed upward to open marine conditions. Both environments most probably characterize the platform setting.
英文关键词	Siwa Oasis Miocene Marmarica Formation microfacies depositional environment cyclicity
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:001151581500001
WOS关键词	CARBONATE PLATFORM ; DACHSTEIN LIMESTONE ; COASTAL-PLAIN ; FACIES ; ENVIRONMENTS ; NORTHERN ; CYCLES ; DIAGENESIS ; DOLOMITE ; ORIGIN
WOS类目	Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
WOS研究方向	Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/404925
推荐引用方式 GB/T 7714	Khalifa, Mohamed A.,Zaky, Amr S.,Jovane, Luigi,et al. The Middle Miocene Microfacies, Cyclicity, and Depositional History: Implications on the Marmarica Formation at the Siwa Oasis, Western Desert (Egypt)[J],2024,14(1).
APA	Khalifa, Mohamed A.,Zaky, Amr S.,Jovane, Luigi,El-Hewy, Ahmed M.,Zahran, Esam,&Kasem, Atef M..(2024).The Middle Miocene Microfacies, Cyclicity, and Depositional History: Implications on the Marmarica Formation at the Siwa Oasis, Western Desert (Egypt).MINERALS,14(1).
MLA	Khalifa, Mohamed A.,et al."The Middle Miocene Microfacies, Cyclicity, and Depositional History: Implications on the Marmarica Formation at the Siwa Oasis, Western Desert (Egypt)".MINERALS 14.1(2024).