干旱区生态环境知识资源中心(Arid): Characteristics of lava-sediments interactions during emplacement of mid-Tertiary volcanism, Northeastern Desert, Egypt: field geology and geochemistry approach

Arid

DOI	10.1007/s12517-020-05310-0
	Characteristics of lava-sediments interactions during emplacement of mid-Tertiary volcanism, Northeastern Desert, Egypt: field geology and geochemistry approach
	El Desoky, Hatem M.; Shahin, Taher M.
通讯作者	Shahin, Taher M.
来源期刊	ARABIAN JOURNAL OF GEOSCIENCES
ISSN	1866-7511
EISSN	1866-7538
出版年	2020
卷号	13 期号:9
英文摘要	Mid-Tertiary volcanism in the Northeastern Desert of Egypt was associated with the African-Arabian plate rifting and opening of the Red Sea, a period of 30 Ma (Late Oligocene). The resulted lava flows, predominately basaltic sheets, have mingled with the underlying sediments, forming peperite along the contact between them. Field geology, petrography, and geochemistry methods have been used to identify the behavior of the lava-sediment interaction which produced peperite. Two types of peperite have been recognized, fluidal at Naqb Ghul and El-Yahmum areas, and blocky at El-Qattamiya area. Sometimes, the two types are represented together at the El-Qattamiya area. Fluidal peperite is characterized by globular and equant juvenile clasts and with irregular or ragged margins suggesting low viscosity, ductile fragmentation, and sediment fluidization. Blocky peperites are characterized by angular, polyhedral, platy juvenile clasts and a jigsaw-crack texture, resulted from quenching of magma in a brittle regime. The coexistence of fluidal and blocky clasts together reflects progressive disintegration and suggests decreasing temperature and increasing viscosity during fragmentation. The presence of sediments in vesicles and in fractures in the peperite zone indicates a non-explosive phase of interaction. Geochemical data suggests that different composition across the magma/sediment boundary is a result of silicification and sediment fluidization.
英文关键词	Peperite Lava sediment interaction Oligocene North Eastern Desert Egypt
类型	Article
语种	英语
国家	Egypt
收录类别	SCI-E
WOS记录号	WOS:000527945700001
WOS关键词	NORTHERN SIERRA-NEVADA ; ASH-FLOW TUFF ; WET SEDIMENTS ; PEPERITE ; MAGMA ; FLUIDIZATION ; EXAMPLES ; COMPLEX ; BASALT ; ROCKS
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/2XILL650/314095
作者单位	Al Azhar Univ, Dept Geol, Fac Sci, POB 11884, Cairo, Egypt
推荐引用方式 GB/T 7714	El Desoky, Hatem M.,Shahin, Taher M.. Characteristics of lava-sediments interactions during emplacement of mid-Tertiary volcanism, Northeastern Desert, Egypt: field geology and geochemistry approach[J],2020,13(9).
APA	El Desoky, Hatem M.,&Shahin, Taher M..(2020).Characteristics of lava-sediments interactions during emplacement of mid-Tertiary volcanism, Northeastern Desert, Egypt: field geology and geochemistry approach.ARABIAN JOURNAL OF GEOSCIENCES,13(9).
MLA	El Desoky, Hatem M.,et al."Characteristics of lava-sediments interactions during emplacement of mid-Tertiary volcanism, Northeastern Desert, Egypt: field geology and geochemistry approach".ARABIAN JOURNAL OF GEOSCIENCES 13.9(2020).