干旱区生态环境知识资源中心(Arid): Two-stage crustal growth in the Arabian-Nubian shield: Initial arc accretion followed by plume-induced crustal reworking

Arid

DOI	10.1016/j.precamres.2021.106211
	Two-stage crustal growth in the Arabian-Nubian shield: Initial arc accretion followed by plume-induced crustal reworking
	El Dien, Hamed Gamal; Li, Zheng-Xiang; Abu Anbar, Mohamed; Doucet, Luc S.; Murphy, J. Brendan; Evans, Noreen J.; Xia, Xiao-Ping; Li, Jiangyu
通讯作者	El Dien, HG (corresponding author), Curtin Univ, Sch Earth & Planetary Sci, Inst Geosci Res TIGeR, Earth Dynam Res Grp, GPO Box U1987, Perth, WA 6845, Australia.
来源期刊	PRECAMBRIAN RESEARCH
ISSN	0301-9268
EISSN	1872-7433
出版年	2021
卷号	359
英文摘要	Island-arc accretion during the assembly of Gondwana has been widely regarded as the main mechanism for Neoproterozoic crustal growth in the Arabian-Nubian Shield (ANS). However, processes involved to transform the newly accreted juvenile terranes into a typical continental crust remain unclear. Here, we present geochemical, isotopic, and U-Pb geochronological data from the El-Shadli volcanic province (80 km x 35 km and > 10 km thick) in the Eastern Desert of Egypt, which lies in the north-western part of the ANS, and overlies strongly deformed, previously accreted arc terranes. The El-Shadli volcanic province consists mainly of a mafic-felsic bimodal suite and subordinate intermediate rocks that intrude the mafic rocks of the suite. The bimodal suite rocks are tholeiitic, whereas the intermediate rocks have a calc-alkaline affinity. The bimodal suite and the intermediate rocks both yield U-Pb zircon ages of similar to 700 Ma implying they are coeval. High zircon epsilon Hf-(t) values for the bimodal suite (average epsilon Hf-(t) = +11.46) as well as the intermediate rocks (average epsilon Hf-(t) = +9.76) indicate they were either magmatic extractions derived directly from a depleted mantle source, or the products of remelting of juvenile crust. Oxygen isotope data for zircon yield similar delta O-18 values for both the bimodal suite (average delta O-18 = 4.94 parts per thousand) and intermediate rocks (average delta O-18 = 4.79 parts per thousand). These are lower than typical mantle values indicating the parental magma in both cases interacted with hydrothermal fluids. Based on the petrological, geochemical, and isotopic data, we suggest that the El-Shadli bimodal suite and the intermediate rocks were produced by reworking of MORB-like and arc-like oceanic lithosphere, respectively, most likely driven by a mantle plume during the break-up of Rodinia. The recognition of the El-Shadli volcanic province as a likely mantle plume-induced post-kinematic magmatism provides a mechanism for the transformation of newly accreted juvenile crustal terranes into a chemically stratified normal continental crust. In addition, such plume events may result in new mantle extractions that are converted into new continental crust.
英文关键词	Neoproterozoic Crustal growth Crustal transformation Arabian-Nubian Shield Mantle plume Rift magmatism
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000652106800022
WOS关键词	CENTRAL EASTERN DESERT ; A-TYPE GRANITES ; ZIRCON U-PB ; BIMODAL VOLCANIC-ROCKS ; SOUTH CHINA ; OXYGEN ISOTOPES ; CONTINENTAL GROWTH ; NEOPROTEROZOIC GRANITOIDS ; TECTONIC EVOLUTION ; DOKHAN VOLCANICS
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/2XILL650/351426
作者单位	[El Dien, Hamed Gamal; Li, Zheng-Xiang; Doucet, Luc S.; Murphy, J. Brendan; Li, Jiangyu] Curtin Univ, Sch Earth & Planetary Sci, Inst Geosci Res TIGeR, Earth Dynam Res Grp, GPO Box U1987, Perth, WA 6845, Australia; [El Dien, Hamed Gamal; Abu Anbar, Mohamed] Tanta Univ, Fac Sci, Geol Dept, Tanta 31527, Egypt; [Murphy, J. Brendan] St Francis Xavier Univ, Dept Earth Sci, Antigonish, NS, Canada; [Evans, Noreen J.] Curtin Univ, John de Laeter Ctr, Sch Earth & Planetary Sci, GPO Box U1987, Perth, WA 6845, Australia; [Xia, Xiao-Ping] Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
推荐引用方式 GB/T 7714	El Dien, Hamed Gamal,Li, Zheng-Xiang,Abu Anbar, Mohamed,et al. Two-stage crustal growth in the Arabian-Nubian shield: Initial arc accretion followed by plume-induced crustal reworking[J],2021,359.
APA	El Dien, Hamed Gamal.,Li, Zheng-Xiang.,Abu Anbar, Mohamed.,Doucet, Luc S..,Murphy, J. Brendan.,...&Li, Jiangyu.(2021).Two-stage crustal growth in the Arabian-Nubian shield: Initial arc accretion followed by plume-induced crustal reworking.PRECAMBRIAN RESEARCH,359.
MLA	El Dien, Hamed Gamal,et al."Two-stage crustal growth in the Arabian-Nubian shield: Initial arc accretion followed by plume-induced crustal reworking".PRECAMBRIAN RESEARCH 359(2021).