干旱区生态环境知识资源中心(Arid): On the cratonization of the Arabian-Nubian Shield: Constraints from gneissic granitoids in south Eastern Desert, Egypt

Arid

DOI	10.1016/j.gsf.2021.101148
	On the cratonization of the Arabian-Nubian Shield: Constraints from gneissic granitoids in south Eastern Desert, Egypt
	Khudeir, Ali A.; Paquette, Jean-Louis; Nicholson, Kirsten; Johansson, Ake; Rooney, Tyrone O.; Hamid, Sadiq; El-Fadly, Mohamed A.; Corcoran, Loretta; Malone, Shawn J.; Abu El-Rus, Mohamed Ali
通讯作者	Abu El-Rus, MA (corresponding author), Assiut Univ, Fac Sci, Geol Dept, Assiut 71516, Egypt.
来源期刊	GEOSCIENCE FRONTIERS
ISSN	1674-9871
出版年	2021
卷号	12 期号:4
英文摘要	The Shaitian granite complex (SGC) spans more than 80 Ma of crustal growth in the Arabian-Nubian Shield in southeast Egypt. It is a voluminous composite intrusion (60 km(2)) comprising a host tonalite massif intruded by subordinate dyke-like masses of trondhjemite, granodiorite and monzogranite. The host tonalite, in turn, encloses several, fine-grained amphibolite enclaves. U-Pb zircon dating indicates a wide range of crystallization ages within the SGC (800 +/- 18 Ma for tonalites; 754 +/- 3.9 Ma for trondhjemite; 738 +/- 3.8 Ma for granodiorite; and 717 +/- 3.2 Ma for monzogranite), suggesting crystallization of independent magma pulses. The high positive epsilon(Ndi) (+6-+8) indicate that the melting sources were dominated by juvenile material without any significant input from older crust. Application of zircon saturation geothermometry indicates increasing temperatures during the generation of melts from 745 +/- 31 degrees C for tonalite to 810 +/- 25 degrees C for trondhjemite; 840 +/- 10 degrees C for granodiorite; and 868 +/- 10 degrees C for monzogranite. The pressure of partial melting is loosely constrained to be below the stability of residual garnet (<10 kbar) as inferred from the almost flat HREE pattern ((Gd/Lu)(N) = 0.9-1.1), but >3 kbar for the stability of residual amphibole as inferred from the significantly lower Nb-N and Ta-N compared with LREEN and the sub-chondrite Nb/Ta ratios exhibited by the granitic phases. The inverse relation between the generation temperatures and the ages estimates of the granitoid lithologies argue against a significant role of fractional crystallization. The major and trace element contents indicate the emplacement of the SGC within a subduction zone setting. It lacks distinctive features for melt derived from a subducted slab (e.g. high Sr/Y and high (La/Yb)(N) ratios), and the relatively low MgO and Ni contents in all granite phases within the SGC suggest melting within the lower crust of an island arc overlying a mantle wedge. Comparison with melts produced during melting experiments indicates an amphibolite of basaltic composition is the best candidate as source for the tonalite, trondhjemite and granodiorite magmas whereas the monzogranite magma is most consistent with fusion of a tonalite protolith. Given the overlapping Sm-Nd isotope ratios as well as several trace element ratios between monzogranite and tonalite samples, it is reasonable to suggest that the renewed basaltic underplating may have caused partial melting of tonalite and the emplacement of monzogranite melt within the SGC. The emplacement of potassic granite (monzogranite) melts subsequent to the emplacement of Na-rich granites (tonalite-trondhjemite-granodiorite) most likely suggests major crustal thickening prior arc collision and amalgamation into the over thickened proto-crust of the Arabian-Nubian shield. Eventually, after complete consolidation, the whole SGC was subjected to regional deformation, most probably during accretion to the Saharan Metacraton (arc-continent collisions) in the late Cryogenian-Ediacaran times (650-542 Ma). (c) 2021 China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V.
英文关键词	Arabian-Nubian Shield (ANS) Cratonization Fractional crystallization Partial melting Subduction zones Tonalite-Trondhjemite-granodiorite (TTG)
类型	Article
语种	英语
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000654356800017
WOS关键词	TRONDHJEMITE-GRANODIORITE TTG ; UNDERPLATED BASALTIC CRUST ; EARLY CONTINENTAL-CRUST ; U-TH-PB ; TRACE-ELEMENT ; ND-ISOTOPES ; PARTITION-COEFFICIENTS ; ZIRCON SATURATION ; MAGMATIC ACTIVITY ; ZABARGAD ISLAND
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
来源机构	French National Research Institute for Sustainable Development
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350429
作者单位	[Khudeir, Ali A.; Hamid, Sadiq; El-Fadly, Mohamed A.; Abu El-Rus, Mohamed Ali] Assiut Univ, Fac Sci, Geol Dept, Assiut 71516, Egypt; [Paquette, Jean-Louis] Univ Clermont Auvergne, CNRS, IRD, OPGC,Lab Magmas & Volcans, F-63000 Clermont Ferrand, France; [Nicholson, Kirsten; Malone, Shawn J.] Ball State Univ, Dept Environm Geol & Nat Resources, 117 Fine Art Bldg, Muncie, IN 47306 USA; [Johansson, Ake] Swedish Museum Nat Hist, Dept Geosci, Box 50007, SE-10405 Stockholm, Sweden; [Rooney, Tyrone O.] Michigan State Univ, Dept Earth & Environm Sci, E Lansing, MI 48824 USA; [Corcoran, Loretta] Notre Dame Univ, Dept Civil & Environm Engn & Earth Sci, 156 Fitzpatrick Hall, Notre Dame, IN 46556 USA
推荐引用方式 GB/T 7714	Khudeir, Ali A.,Paquette, Jean-Louis,Nicholson, Kirsten,et al. On the cratonization of the Arabian-Nubian Shield: Constraints from gneissic granitoids in south Eastern Desert, Egypt[J]. French National Research Institute for Sustainable Development,2021,12(4).
APA	Khudeir, Ali A..,Paquette, Jean-Louis.,Nicholson, Kirsten.,Johansson, Ake.,Rooney, Tyrone O..,...&Abu El-Rus, Mohamed Ali.(2021).On the cratonization of the Arabian-Nubian Shield: Constraints from gneissic granitoids in south Eastern Desert, Egypt.GEOSCIENCE FRONTIERS,12(4).
MLA	Khudeir, Ali A.,et al."On the cratonization of the Arabian-Nubian Shield: Constraints from gneissic granitoids in south Eastern Desert, Egypt".GEOSCIENCE FRONTIERS 12.4(2021).