干旱区生态环境知识资源中心(Arid): Geochemistry of Khor Um-Safi ophiolitic serpentinites, central Eastern desert, Egypt: Implications for neoproterozoic arc-basin system in the Arabian-Nubian shield

Arid

DOI	10.1016/j.chemer.2020.125690
	Geochemistry of Khor Um-Safi ophiolitic serpentinites, central Eastern desert, Egypt: Implications for neoproterozoic arc-basin system in the Arabian-Nubian shield
	Ali, Shehata; Ntaflos, Theodoros; Sami, Mabrouk
通讯作者	Ali, S (corresponding author), Menia Univ, Fac Sci, Geol Dept, El Minia 61519, Egypt.
来源期刊	GEOCHEMISTRY
ISSN	0009-2819
EISSN	1611-5864
出版年	2021
卷号	81 期号:1
英文摘要	Serpentinites in the Eastern Desert of Egypt are the most distinctive lithological unit in the Arabian-Nubian Shield (ANS) ophiolite sequence which associated with major suture zones. Khor Um-Safi (KUS) serpentinites represent dismembered fragments of ophiolitic rocks located in the central Eastern Desert (CED) of Egypt. KUS serpentinites exhibit affinity to the typical metamorphic peridotites with harzburgitic protolith compositions. Their opaque mineral assemblage (pentlandite, heazlewoodite and magnetite) is similar to that observed in oceanic serpentinites and implies serpentinization under highly reducing conditions. They have refractory major element compositions with Al2O3 contents comparable to oceanic and active margin peridotites as well as Pan-African serpentinites. The Cr and TiO2 contents reflect evolution within a supra-subduction zone (SSZ) environment. This implication is confirmed by the Al2O3/SiO2 and MgO/SiO2 ratios which akin to ANS ophiolitic peridotites in fore-arc setting. Their enrichment in compatible trace elements (Cr, Ni and Co) reveals a depleted mantle peridotite protolith. Modelling trace elements indicates that they represent the mantle residues from 15 to 20 % melting of spinel peridotite at oxygen fugacity conditions of the QFM + 1 buffer. This range of melt extraction is consistent with the typical range of SSZ peridotite. Oxygen fugacity estimation suggests evolution under more oxidizing regime similar to modern fore-arc basin system. Moreover, this implication indicates that the KUS mantle represents arc lithosphere interacted with arc melt.
英文关键词	Serpentinite Subduction zone Neoproterozoic Khor Um-Safi Ophiolite Eastern desert Egypt
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000645660900013
WOS关键词	RARE-EARTH PATTERNS ; ABYSSAL PERIDOTITES ; MINERAL CHEMISTRY ; PETROLOGICAL CHARACTERISTICS ; SUBDUCTION INITIATION ; MANTLE PERIDOTITES ; ZONE ; CONSTRAINTS ; LITHOSPHERE ; EVOLUTION
WOS类目	Geochemistry & Geophysics
WOS研究方向	Geochemistry & Geophysics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350366
作者单位	[Ali, Shehata; Sami, Mabrouk] Menia Univ, Fac Sci, Geol Dept, El Minia 61519, Egypt; [Ntaflos, Theodoros] Univ Vienna, Dept Lithospher Res, Althanstr 14, A-1090 Vienna, Austria
推荐引用方式 GB/T 7714	Ali, Shehata,Ntaflos, Theodoros,Sami, Mabrouk. Geochemistry of Khor Um-Safi ophiolitic serpentinites, central Eastern desert, Egypt: Implications for neoproterozoic arc-basin system in the Arabian-Nubian shield[J],2021,81(1).
APA	Ali, Shehata,Ntaflos, Theodoros,&Sami, Mabrouk.(2021).Geochemistry of Khor Um-Safi ophiolitic serpentinites, central Eastern desert, Egypt: Implications for neoproterozoic arc-basin system in the Arabian-Nubian shield.GEOCHEMISTRY,81(1).
MLA	Ali, Shehata,et al."Geochemistry of Khor Um-Safi ophiolitic serpentinites, central Eastern desert, Egypt: Implications for neoproterozoic arc-basin system in the Arabian-Nubian shield".GEOCHEMISTRY 81.1(2021).