干旱区生态环境知识资源中心(Arid): Composition and origin of Ti-Nb-Ta-Zr bearing minerals in the Abu Diab highly evolved granite from the Central Eastern Desert of Egypt

Arid

DOI	10.1016/j.jafrearsci.2020.103808
	Composition and origin of Ti-Nb-Ta-Zr bearing minerals in the Abu Diab highly evolved granite from the Central Eastern Desert of Egypt
	Sami, Mabrouk 1; Mahdy, Nasser M.3; Ntaflos, Theodoros 2; Fathy, Douaa 1
通讯作者	Sami, Mabrouk
来源期刊	JOURNAL OF AFRICAN EARTH SCIENCES
ISSN	1464-343X
EISSN	1879-1956
出版年	2020
卷号	165
英文摘要	The central Eastern Desert (CED) of Egypt is well-known for its granite-related Nb-Ta mineralization. The garnet-bearing muscovite granite (GMG) of the Abu-Diab composite pluton in the CED consists mainly of quartz, K-feldspar (Or(88-98)), albite (An(0-4)) and muscovite, with accessory minerals including garnet, zircon, columbite, ilmenite, Ti-rich hematite, rutile, ilmenorutile, thorite, apatite, xenotime and chlorite. The GMG is weakly peraluminous and has low Nb/Ta (9.6-15.4) and Zr/Hf (16-31) with discernible REEs tetrad effect (TE1-3 = 1.11-1.35), typical of highly evolved granites. Zircon contains high concentrations of U and Th typical of late-magmatic zircon and similar to zircon type from highly evolved granite. The homogenous and weak zoned columbites are classified as manganocolumbite. The formation of Ta-rich rim in the columbite may indicate that later fluids were from the GMG granite itself at advanced fractionation into exsolving fluids, and not from an external source. Ilmenite is greatly enriched in MnO, which indicates the significant pyrophanite (up to 29 mol %) molecules in ilmenite through simple substitution of Mn for Fe2+ with increasing oxygen fugacity under magmatic-hydrothermal conditions. Xenotimes show low analytical totals, suggesting probably hydration during their post-magmatic alteration, while apatite is small-grained associated with tiny zircons, suggesting late-crystalized phases. During late magmatic differentiation stage, the interaction of granitic melt with F-rich late magmatic fluids could be resulted in the formation of Ti-Nb-Ta-Zr minerals. Overall, the Abu Diab GMG possesses mineralogical and geochemical features that make it a potential target for Ti-Nb-Ta-Zr minerals.
英文关键词	Highly evolved granite Ti-Nb-Ta-Zr minerals Columbite-Mn Late-magmatic zircon Xenotime Tetrad effect
类型	Article
语种	英语
国家	Egypt ; Austria
收录类别	SCI-E
WOS记录号	WOS:000526109900010
WOS关键词	A-TYPE GRANITES ; ARABIAN-NUBIAN SHIELD ; RARE-METAL GRANITOIDS ; ACCESSORY MINERALS ; U-RICH ; ZIRCON ; GEOCHEMISTRY ; MINERALIZATION ; PETROGENESIS ; CHEMISTRY
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/2XILL650/314846
作者单位	1.Menia Univ, Fac Sci, Geol Dept, El Minia 61519, Egypt; 2.Univ Vienna, Dept Lithospher Res, Althanstr 14, A-1090 Vienna, Austria; 3.Nucl Mat Author, PO 530, Cairo, Egypt
推荐引用方式 GB/T 7714	Sami, Mabrouk,Mahdy, Nasser M.,Ntaflos, Theodoros,et al. Composition and origin of Ti-Nb-Ta-Zr bearing minerals in the Abu Diab highly evolved granite from the Central Eastern Desert of Egypt[J],2020,165.
APA	Sami, Mabrouk,Mahdy, Nasser M.,Ntaflos, Theodoros,&Fathy, Douaa.(2020).Composition and origin of Ti-Nb-Ta-Zr bearing minerals in the Abu Diab highly evolved granite from the Central Eastern Desert of Egypt.JOURNAL OF AFRICAN EARTH SCIENCES,165.
MLA	Sami, Mabrouk,et al."Composition and origin of Ti-Nb-Ta-Zr bearing minerals in the Abu Diab highly evolved granite from the Central Eastern Desert of Egypt".JOURNAL OF AFRICAN EARTH SCIENCES 165(2020).