Arid
DOI10.1016/j.oregeorev.2015.05.001
Petrogenesis of U- and Mo-bearing A(2)-type granite of the Gattar batholith in the Arabian Nubian Shield, Northeastern Desert, Egypt: Evidence for the favorability of host rocks for the origin of associated ore deposits
Mahdy, Nasser M.1; El Kalioubi, Baher A.2; Wohlgemuth-Ueberwasser, Cora C.3; Shalaby, Mahmoud H.1; El-Afandy, Adel H.1
通讯作者Mahdy, Nasser M.
来源期刊ORE GEOLOGY REVIEWS
ISSN0169-1368
EISSN1872-7360
出版年2015
卷号71页码:57-81
英文摘要

Hydrothermal ore deposits associated with granitic rocks are the result of combinations and series of successive processes, events and conditions in a magma system and at post-magmatic stage. The metal content of a granitic magma as well as fractional crystallization, metal-ligand complexation, emplacement mechanisms and tectonic processes influence the metal precipitation and content of a hydrothermal ore deposit. The present study of the Gattar batholith evaluates how these processes contribute to the generation of an ore deposit. Gattar batholith in the north Eastern Desert of Egypt as part of the northern region of the Arabian-Nubian Shield (ANS) is geographically, mineralogically and geochemically divided into two distinctive areas. The southern part mainly consists of syenogranite while the northern part is dominated by highly evolved alkali-feldspar granite. Uranium and Mo mineralization occurring here is mostly limited to the margin of the highly evolved alkali-feldspar granites. New U-Pb zircon geochronology within this study indicates an age of similar to 620-600 Ma, although high common Pb and discordant age data of many zircon grains reflect alteration by F-rich fluids. Some zircons with distinct older U/Pb ages were considered to be inherited from the wall rocks representing juvenile crust of the ANS. The two different granitic rocks are comagmatic in origin and have A-type characteristics generated by partial melting of lower juvenile crust of the ANS. Geochemical data are in good agreement with a magmatic origin of the alkali-feldspar granites, suggesting fractional crystallization of a syenogranitic source as the most favorable process of their formation. Petrography, geochemistry, and geochronology studies of the Gattar granites along with field observations provide evidence for multiple intrusions as a result of successive magma pulses with different chemical composition. This led to the formation of reverse zoning within the intrusive complex. This kind of magma emplacement promotes the escape of exsolved metal-bearing volatile-rich fluids into the boundary of the Hammamat Sedimentary Rocks (HSR) and Gattar granite at the northern part of the batholith. Build-up of volatiles is a common phenomenon in granitic rocks and typically results in enhanced contents of F, alkalis and ore metals released at subsolidus stage. (C) 2015 Elsevier B.V. All rights reserved.


英文关键词Gattar batholith Uranium Molybdenum A-type granite Hydrothermal ore deposits Arabian-Nubian Shield
类型Article
语种英语
国家Egypt ; Sweden
收录类别SCI-E
WOS记录号WOS:000360419300005
WOS关键词A-TYPE GRANITES ; CENTRAL EASTERN DESERT ; ABLATION-ICP-MS ; HYDROTHERMAL ALTERATION ; GEOCHEMICAL CHARACTERISTICS ; POSTCOLLISIONAL GRANITOIDS ; TECTONOMAGMATIC EVOLUTION ; ELEMENT GEOCHEMISTRY ; PB GEOCHRONOLOGY ; URANIUM DISTRICT
WOS类目Geology ; Mineralogy ; Mining & Mineral Processing
WOS研究方向Geology ; Mineralogy ; Mining & Mineral Processing
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/189441
作者单位1.Nucl Mat Author, Cairo, Egypt;
2.Ain Shams Univ, Fac Sci, Dept Geol, Cairo, Egypt;
3.Stockholm Univ, Dept Geol Sci, PetroTecton Facil, S-10691 Stockholm, Sweden
推荐引用方式
GB/T 7714
Mahdy, Nasser M.,El Kalioubi, Baher A.,Wohlgemuth-Ueberwasser, Cora C.,et al. Petrogenesis of U- and Mo-bearing A(2)-type granite of the Gattar batholith in the Arabian Nubian Shield, Northeastern Desert, Egypt: Evidence for the favorability of host rocks for the origin of associated ore deposits[J],2015,71:57-81.
APA Mahdy, Nasser M.,El Kalioubi, Baher A.,Wohlgemuth-Ueberwasser, Cora C.,Shalaby, Mahmoud H.,&El-Afandy, Adel H..(2015).Petrogenesis of U- and Mo-bearing A(2)-type granite of the Gattar batholith in the Arabian Nubian Shield, Northeastern Desert, Egypt: Evidence for the favorability of host rocks for the origin of associated ore deposits.ORE GEOLOGY REVIEWS,71,57-81.
MLA Mahdy, Nasser M.,et al."Petrogenesis of U- and Mo-bearing A(2)-type granite of the Gattar batholith in the Arabian Nubian Shield, Northeastern Desert, Egypt: Evidence for the favorability of host rocks for the origin of associated ore deposits".ORE GEOLOGY REVIEWS 71(2015):57-81.
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