干旱区生态环境知识资源中心(Arid): Characteristic of gold mineralization associated with granites at Hamash old gold mine, South Eastern Desert, Egypt

Arid

DOI	10.1007/s12517-021-06923-9
	Characteristic of gold mineralization associated with granites at Hamash old gold mine, South Eastern Desert, Egypt
	El-Desoky, Hatem M.; Shahin, Taher M.; Amer, Yahia Z.
通讯作者	Shahin, TM (corresponding author), Al Azhar Univ, Fac Sci, Geol Dept, POB 11884, Cairo, Egypt.
来源期刊	ARABIAN JOURNAL OF GEOSCIENCES
ISSN	1866-7511
EISSN	1866-7538
出版年	2021
卷号	14 期号:7
英文摘要	Well-known controversy over the genesis of orogenic gold mineralization in granites has been a subject of research worldwide. Hamash gold mine is considered one of the pharaohs mines in the South Eastern Desert of Egypt, where gold mineralization is hosted by granites. In this study, we utilized field, ore microscopy, and geochemical data to determine the genesis of granites and the associated gold deposits. We found that the granites, intruded into island-arc metavolcanics and metavolcanoclastic assemblages, are characterized by variable major and trace elements, calc-alkaline, and I-type granitoids that reflect a fractional crystallization. Their trace and rare earth elements reflect magma that is related to subduction tectonic setting. The gold mineralization is confined to quartz veins that cut through granitic rocks, extend in NW-SE and N-S directions, and are formed during shear-extensional tectonics. The gold is found with sulfides in quartz veins and wallrock alteration. Silicification and sericitization are the most hydrothermal alteration zones associated the ore formation, comprise an inner quartz-sericite-carbonate-chlorite-sulfide assemblage. The results of chemical analysis reveal an increase of SiO2, Fe2O3, S, and L.O.I. concentrations and moderate depletion in K2O, Na2O, and LILE suggesting that they were affected by mineral replacement reactions and sulfidation in the altered wallrocks close to Au-quartz veins. The gold is represented by tiny inclusions, with minor chalcopyrite, galena, and arsenopyrite that mainly fill the microfracture in quartz and pyrite grains. Furthermore, a general model of gold mineralization suggests that the gold was contemporaneously formed during syn-orogenic stage, transpressional deformation assigned to D2 deformation, and subduction-related thermal processes followed by gold-bearing fluids that fill the fractures, forming veins.
英文关键词	Geochemistry Gold mineralization Quartz veins Hydrothermal alteration Hamash gold mine Egypt
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000631492600008
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/2XILL650/349558
作者单位	[El-Desoky, Hatem M.; Shahin, Taher M.] Al Azhar Univ, Fac Sci, Geol Dept, POB 11884, Cairo, Egypt; [Amer, Yahia Z.] Hamash Misr Gold Mines Co, Cairo, Egypt
推荐引用方式 GB/T 7714	El-Desoky, Hatem M.,Shahin, Taher M.,Amer, Yahia Z.. Characteristic of gold mineralization associated with granites at Hamash old gold mine, South Eastern Desert, Egypt[J],2021,14(7).
APA	El-Desoky, Hatem M.,Shahin, Taher M.,&Amer, Yahia Z..(2021).Characteristic of gold mineralization associated with granites at Hamash old gold mine, South Eastern Desert, Egypt.ARABIAN JOURNAL OF GEOSCIENCES,14(7).
MLA	El-Desoky, Hatem M.,et al."Characteristic of gold mineralization associated with granites at Hamash old gold mine, South Eastern Desert, Egypt".ARABIAN JOURNAL OF GEOSCIENCES 14.7(2021).