干旱区生态环境知识资源中心(Arid): Geochemical Constraints of the Ediacaran Volcano-Sedimentary Succession of the Sa'al Metamorphic Complex at Wadi Zaghra, South Sinai, Egypt

Arid

DOI	10.1111/1755-6724.13762
	Geochemical Constraints of the Ediacaran Volcano-Sedimentary Succession of the Sa'al Metamorphic Complex at Wadi Zaghra, South Sinai, Egypt
	Samuel, D. Michael; Moussa, E. Hilmy; Azer, K. Mokhles; Sadek Ghabrial, Doris
通讯作者	Azer, K. Mokhles
来源期刊	ACTA GEOLOGICA SINICA-ENGLISH EDITION
ISSN	1000-9515
EISSN	1755-6724
出版年	2019
卷号	93 期号:1 页码:50-73
英文摘要	The volcano-sedimentary succession around Wadi Zaghra in Sinai, at the northernmost segment of the Arabian Nubian Shield, comprises volcanic rocks interbedded with rather immature sediments. The succession is dominated by intermediate to silicic volcanics of medium- to high-K calc-alkaline affinity. It is divided into two units, the lower unit includes intermediate rocks and dacites interbedded with graywackes, semi-pelites and pelites and topped by polymict conglomerates. This unit is subjected to folding and regional metamorphism (up to garnet zone) and is intruded by quartz diorite-granodiorite inducing, locally, low-pressure contact thermal metamorphism. The unmetamorphosed upper unit encompasses acid volcanics intercalated with litharenite, sublitharenite and minor arenite. The rhyolites of this unit pertain to the highly fractionated granites and are characterized by an agpaitic index (NK/A) ranging from 0.87 to 0.96. They may reflect either extensive interaction of subduction-related magmas with the continental crust or a change in the tectonic regime. The present lithological and geochemical characteristics of the studied sediments together with available zircon ages indicate rather distal provenance of their detritus. This detritus comprises fluvial-alluvial sediments accumulated in the intermontane basins, which are half-grabens or tilted fault blocks. The tectonic setting of the depositional basins is active continental margin and continental island arcs. Geochemical patterns of the Zaghra volcano-sedimentary succession indicate their correlation with the Dokhan Volcanics-Hammamat Clastics sequence of the Eastern Desert of Egypt. Also, the Zaghra volcanics display geochemical similarities with those exposed in Sinai, at the Rutig, Ferani and Iqna Shar'a areas. The Zaghra succession is dated as Ediacaran but is not related either to the ensimatic island arc assemblage or to the rift-related assemblage formed during the early stages of the break-up of Rodinia as previously thought.
英文关键词	geochemistry Neoproterozoic Dokhan Volcanics Arabian-Nubian Shield Sinai Egypt
类型	Article
语种	英语
国家	Egypt
收录类别	SCI-E
WOS记录号	WOS:000461610000004
WOS关键词	ARABIAN-NUBIAN SHIELD ; NORTH-EASTERN DESERT ; CRUSTAL EVOLUTION ; CALC-ALKALINE ; TECTONOMAGMATIC EVOLUTION ; DOKHAN VOLCANICS ; HAMMAMAT GROUP ; ARC ; ROCKS ; PB
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/2XILL650/213838
作者单位	NRC, Geol Sci Dept, Cairo, Egypt
推荐引用方式 GB/T 7714	Samuel, D. Michael,Moussa, E. Hilmy,Azer, K. Mokhles,et al. Geochemical Constraints of the Ediacaran Volcano-Sedimentary Succession of the Sa'al Metamorphic Complex at Wadi Zaghra, South Sinai, Egypt[J],2019,93(1):50-73.
APA	Samuel, D. Michael,Moussa, E. Hilmy,Azer, K. Mokhles,&Sadek Ghabrial, Doris.(2019).Geochemical Constraints of the Ediacaran Volcano-Sedimentary Succession of the Sa'al Metamorphic Complex at Wadi Zaghra, South Sinai, Egypt.ACTA GEOLOGICA SINICA-ENGLISH EDITION,93(1),50-73.
MLA	Samuel, D. Michael,et al."Geochemical Constraints of the Ediacaran Volcano-Sedimentary Succession of the Sa'al Metamorphic Complex at Wadi Zaghra, South Sinai, Egypt".ACTA GEOLOGICA SINICA-ENGLISH EDITION 93.1(2019):50-73.