干旱区生态环境知识资源中心(Arid): Ore-forming mechanism and its relationship with deformational and metamorphic episodes at Haimur gold mine, Nubian Shield, Egypt

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DOI	10.1017/S0016756820000655
	Ore-forming mechanism and its relationship with deformational and metamorphic episodes at Haimur gold mine, Nubian Shield, Egypt
	Monsef, Mohamed Abd El; Abdelnasser, Amr
通讯作者	Monsef, MA (corresponding author), Tanta Univ, Fac Sci, Geol Dept, Tanta 31527, Egypt. ; Monsef, MA (corresponding author), Masaryk Univ, Fac Sci, Inst Geol Sci, Brno, Czech Republic.
来源期刊	GEOLOGICAL MAGAZINE
ISSN	0016-7568
EISSN	1469-5081
出版年	2021
卷号	158 期号:3 页码:518-536
英文摘要	The Haimur area represents the central part of the Wadi Allaqi region in the southern block of the Egyptian Eastern Desert near Nasser Lake and the Nile valley. It is made up of ophiolitic assemblage comprising serpentinite and talc carbonate, listwenite, metagabbro/amphibolite and metabasalt and island arc assemblages. The orogenic gold deposits in the Haimur area occur in the form of smoky/white sulphide-bearing quartz / quartz-carbonate veins or lenses cutting through the listwenite zone-related rocks. The NE-trending auriferous veins were formed due to an extensional to transtensional shearing related to NW Najd shear tectonics. Gold was observed in association with late-pyrite and chalcopyrite paragenetically formed in the gold phase (second phase), while the first phase is the sulphide phase including early-pyrite and arsenopyrite. Arsenopyrite was formed during early metamorphic recrystallization at a high-temperature range between 405 and 512 degrees C. However, gold was formed at lower temperature through retrograde metamorphism. Three types of fluid inclusions have been recognized: aqueous (type-I), mixed aqueous-carbonic (type-II) and hydrocarbonic (type-III). The P-T conditions of trapping were obtained from the isochore lines of intersection between T = 300-320 degrees C and pressure range of 60-180 MPa. The Haimur gold deposit was supposed to be derived from metamorphic fluids created by dehydration and decarbonation of ophiolitic melange assemblages and volcano-sedimentary rocks, in which the gold was transported as Au(HS)(2-) complexes and precipitated in reduced environment. The strong linkage between the deformation and metamorphism triggered gold deposition in structurally favourable sites related to the Najd fault system.
英文关键词	arsenopyrite thermometry fluid inclusions Najd shearing metamorphism Haimur gold deposit Egypt
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000617280900009
WOS关键词	SOUTH EASTERN DESERT ; AQUEOUS SULFIDE SOLUTIONS ; RED-SEA HILLS ; OROGENIC-GOLD ; FLUID INCLUSIONS ; SHEAR-ZONE ; GREENSTONE-BELT ; DHARWAR CRATON ; NEW-BRUNSWICK ; DEPOSIT
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/2XILL650/350395
作者单位	[Monsef, Mohamed Abd El] Tanta Univ, Fac Sci, Geol Dept, Tanta 31527, Egypt; [Monsef, Mohamed Abd El] Masaryk Univ, Fac Sci, Inst Geol Sci, Brno, Czech Republic; [Abdelnasser, Amr] Benha Univ, Fac Sci, Geol Dept, Banha 13518, Egypt
推荐引用方式 GB/T 7714	Monsef, Mohamed Abd El,Abdelnasser, Amr. Ore-forming mechanism and its relationship with deformational and metamorphic episodes at Haimur gold mine, Nubian Shield, Egypt[J],2021,158(3):518-536.
APA	Monsef, Mohamed Abd El,&Abdelnasser, Amr.(2021).Ore-forming mechanism and its relationship with deformational and metamorphic episodes at Haimur gold mine, Nubian Shield, Egypt.GEOLOGICAL MAGAZINE,158(3),518-536.
MLA	Monsef, Mohamed Abd El,et al."Ore-forming mechanism and its relationship with deformational and metamorphic episodes at Haimur gold mine, Nubian Shield, Egypt".GEOLOGICAL MAGAZINE 158.3(2021):518-536.