Arid
DOI10.1086/705328
Geochemistry and Petrogenesis of Late Ediacaran Rare-Metal Albite Granite of the Nubian Shield: Case Study of Nuweibi Intrusion, Eastern Desert, Egypt
Azer, Mokhles K.1; Abdelfadil, Khaled M.2; Ramadan, Ahmed A.3
通讯作者Azer, Mokhles K.
来源期刊JOURNAL OF GEOLOGY
ISSN0022-1376
EISSN1537-5269
出版年2019
卷号127期号:6页码:665-689
英文摘要The Nuweibi albite granite (NAG) is a postcollisional intrusion emplaced as a high-level magmatic cupola into metamorphic and syntectonic calc-alkaline country rocks. It consists of two cogenetic intrusive bodies: the western, nonporphyritic, albite granite was emplaced deeper than the eastern, fine-grained, porphyritic, albite granite. In places the nonporphyritic phase crosscuts the earlier porphyritic phase, but the occurrence of gradational contacts between the phases implies a near coincidence in time, with the nonporphyritic phase emplaced before crystallization of the porphyritic phase was complete. The steeply dipping slope of the western contact of the Nuweibi pluton against country rocks, in contrast to the gently dipping contacts above the eastern and northeastern parts, indicates the probable location of the cupola apex in the eastern part of the pluton. The NAG intrusion is highly evolved meta- to peraluminous leucocratic rare-metal albite granite. The NAG intrusion is chemically zoned, with upward increases of Al2O3, Na2O, Sr, Ga, and Ta concentrations, alongside upward decreases in SiO2, K2O, Rb, Nb, Zn, Zr, Th, Sn, and rare earth element concentrations. These trends are interrupted by a compositional gap with discontinuities in evolutionary trends of both compatible and incompatible elements, suggesting multiple pulses of intrusion. The NAG was generated via partial melting of a juvenile crust that had undergone extensive fractional crystallization combined with late-magmatic fluid overprint. Accumulation of residual volatile-rich melt and exsolved fluids in the apical part of the magmatic cupola produced stockscheider pegmatite, greisen, and quartz veins that cut the peripheries of the NAG pluton. Metasomatic activity by late- to postmagmatic fluids drove changes in the bulk composition of the cupola, removing K and driving the alkali feldspars toward pure albite.
类型Article
语种英语
国家Egypt
收录类别SCI-E
WOS记录号WOS:000494484500005
WOS关键词A-TYPE GRANITES ; KATHERINA RING COMPLEX ; CALC-ALKALINE ; SOUTHERN SINAI ; TRACE-ELEMENT ; CRUSTAL EVOLUTION ; ARABIAN SHIELD ; HOMRIT WAGGAT ; AREA LOZERE ; ORIGIN
WOS类目Geology
WOS研究方向Geology
EI主题词2019-11-01
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/310447
作者单位1.Natl Res Ctr, Geol Sci Dept, Cairo 12622, Egypt;
2.Sohag Univ, Fac Sci, Geol Dept, Sohag, Egypt;
3.Mansoura Univ, Fac Sci, Geol Dept, Mansoura, Egypt
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Azer, Mokhles K.,Abdelfadil, Khaled M.,Ramadan, Ahmed A.. Geochemistry and Petrogenesis of Late Ediacaran Rare-Metal Albite Granite of the Nubian Shield: Case Study of Nuweibi Intrusion, Eastern Desert, Egypt[J],2019,127(6):665-689.
APA Azer, Mokhles K.,Abdelfadil, Khaled M.,&Ramadan, Ahmed A..(2019).Geochemistry and Petrogenesis of Late Ediacaran Rare-Metal Albite Granite of the Nubian Shield: Case Study of Nuweibi Intrusion, Eastern Desert, Egypt.JOURNAL OF GEOLOGY,127(6),665-689.
MLA Azer, Mokhles K.,et al."Geochemistry and Petrogenesis of Late Ediacaran Rare-Metal Albite Granite of the Nubian Shield: Case Study of Nuweibi Intrusion, Eastern Desert, Egypt".JOURNAL OF GEOLOGY 127.6(2019):665-689.
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