干旱区生态环境知识资源中心(Arid): Constraints of Mantle and Crustal Sources Interaction during Orogenesis of Pre- and Post-collision Granitoids from the Northern Arabian-Nubian Shield: A Case Study from Wadi El-Akhder Granitoids, Southern Sinai, Egypt

Arid

DOI	10.1111/1755-6724.14769
	Constraints of Mantle and Crustal Sources Interaction during Orogenesis of Pre- and Post-collision Granitoids from the Northern Arabian-Nubian Shield: A Case Study from Wadi El-Akhder Granitoids, Southern Sinai, Egypt
	Mogahed, Moustafa M.; Abdelfadil, Khaled M.
通讯作者	Mogahed, MM (corresponding author), Benha Univ, Fac Sci, Geol Dept, Banha 13518, Egypt.
来源期刊	ACTA GEOLOGICA SINICA-ENGLISH EDITION
ISSN	1000-9515
EISSN	1755-6724
出版年	2021
卷号	95 期号:5 页码:1527-1550
英文摘要	The Egyptian older and younger granitic rocks emplaced during pre- and post-collision stages of Neoproterozoic Pan-African orogeny, respectively, are widely distributed in the southern Sinai Peninsula, constituting 70% of the basement outcrops. The Wadi El-Akhder, southwestern Sinai, is a mountainous terrain exposing two granitoid suites, namely the Wadi El-Akhder Older Granites (AOG) and the Homra Younger Granites (HYG). The AOG (granodiorites with subordinate tonalite compositions) have geochemical characteristics of medium-K calc-alkaline, metaluminous to mildly peraluminous granitoids formed in an island-arc environment, which are conformable with well-known Egyptian older granitoids rocks, whereas the HYG display calc-alkaline to slightly alkaline nature, peraluminous syeno-, monzogranites and alkali feldspar granites matching well those of the Egyptian younger granites. With respect to the AOG granitoids, the HYG granites contain lower Al2O3, FeO*, MgO, MnO, CaO, TiO2, Sr, Ba, and V, but higher Na2O, K2O, Nb, Zr, Th, and Rb. The AOG are generally characterized by enrichment in LILE and LREE and depletion in HFSE relative to N-MORB values (e.g., negative Nb and Ta anomalies). The geochemical features of the AOG follow assimilation-fractional crystallization (AFC) trends indicative of extensive crustal contamination of magma derived from a mantle source. The chemical characteristics of the AOG are remarkably similar to those of subduction-related granitoids from the Arabian-Nubian Shield (ANS). The compositional variations from monzogranites through syenogranites to alkali feldspar granite within HYG could not be explained by fractional crystallization solely. Correlating the whole-rock composition of the HYG to melts generated by experimental dehydration melting of meta-sedimentary and magmatic rocks reveals that they appear to be derived by extended melting of psammitic and pelitic metasediments, which is similar to the most of younger granitic suites in the ANS.
英文关键词	older and younger granitoids mantle-crust interaction assimilation-fractional crystallization (AFC) southern Sinai Arabian-Nubian Shield
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000712902000007
WOS关键词	A-TYPE GRANITES ; CENTRAL EASTERN DESERT ; PAN-AFRICAN MAGMATISM ; I-TYPE-GRANITOIDS ; K CALC-ALKALINE ; SLAB BREAK-OFF ; CONTINENTAL-CRUST ; TRACE-ELEMENT ; GEOCHEMICAL CHARACTERISTICS ; NEOPROTEROZOIC GRANITOIDS
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/2XILL650/368026
作者单位	[Mogahed, Moustafa M.] Benha Univ, Fac Sci, Geol Dept, Banha 13518, Egypt; [Abdelfadil, Khaled M.] Sohag Univ, Fac Sci, Geol Dept, Sohag 82524, Egypt
推荐引用方式 GB/T 7714	Mogahed, Moustafa M.,Abdelfadil, Khaled M.. Constraints of Mantle and Crustal Sources Interaction during Orogenesis of Pre- and Post-collision Granitoids from the Northern Arabian-Nubian Shield: A Case Study from Wadi El-Akhder Granitoids, Southern Sinai, Egypt[J],2021,95(5):1527-1550.
APA	Mogahed, Moustafa M.,&Abdelfadil, Khaled M..(2021).Constraints of Mantle and Crustal Sources Interaction during Orogenesis of Pre- and Post-collision Granitoids from the Northern Arabian-Nubian Shield: A Case Study from Wadi El-Akhder Granitoids, Southern Sinai, Egypt.ACTA GEOLOGICA SINICA-ENGLISH EDITION,95(5),1527-1550.
MLA	Mogahed, Moustafa M.,et al."Constraints of Mantle and Crustal Sources Interaction during Orogenesis of Pre- and Post-collision Granitoids from the Northern Arabian-Nubian Shield: A Case Study from Wadi El-Akhder Granitoids, Southern Sinai, Egypt".ACTA GEOLOGICA SINICA-ENGLISH EDITION 95.5(2021):1527-1550.