Arid
DOI10.1007/s12517-015-1882-8
Abu Rusheid lamprophyre dikes, South Eastern Desert, Egypt: as physical-chemical traps for REEs, Zn, Y, U, Cu, W, and Ag
Ibrahim, Mohamed El-Ahmady1; Watanabe, Koichiro2; Saleh, Gehad Mohamed1; Ibrahim, Waleed Saad2
通讯作者Ibrahim, Mohamed El-Ahmady
来源期刊ARABIAN JOURNAL OF GEOSCIENCES
ISSN1866-7511
EISSN1866-7538
出版年2015
卷号8期号:11页码:9261-9270
英文摘要

Five lamprophyre dikes (L-1-L-5) intruded Abu Rusheid rocks (cataclastics and monzogranite) in the South Eastern Desert of Egypt along shear zones with NNW-SSE and E-W. The two sets of dikes differ in age, mineralization, and geochemical aspect. The NNW-SSE trending dikes (L-1 and L-2) are polymineralized and dislocate the E-W (L-3, L-4, and L-5) trending dikes. These dikes underwent multistage of hydrothermal processes (ferrugination, fluoritization, kaolinitization, and calcification). They are characterized by common box works (physical trap) filled by incoming mineralization, and their feldspars and micas are relatively altered to clay minerals (chemical trap). From the mineralogical point of view, the cataclastic rocks are rich in base metals (pyrite, sphalerite, molybdenite, chalcopyrite, and galena), radioactive minerals (thorite, uranophane, kasolite, uranothorite), and accessories phases (zircon, xenotime, cassiterite, molybdenite, copper, columbite, and fluorite). L-1 and L-2 lamprophyre dikes contain U minerals (uranophane, kasolite, autunite, and torbernite), Mn-franklinite, woodruffite, xenotime, fluorite, silver, copper, and scheelite. L-3 contains Zn and U minerals, whereas L-4 and L-5 contain Zn minerals only. The source magma producing lamprophyre dikes (L-1 to L-4) are peralkaline to alkaline, whereas L-5 lamprophyres are mainly calc-alkaline in character; they were generated from the mantle and had formed in a post-collision tectonic setting with extensive Ti-rich metasomatism. The average I REE pound content in (L-1 and L-2) lamprophyres is 8006 ppm. REE patterns display clear concave upward pattern of W-type tetrad effect in the REE pattern accompanied by enrichment of the HREE over the LREE and marked negative Eu anomaly due to secondary mobilization of REEs.


英文关键词Lamprophyre Traps Uranium Zinc REEs
类型Article
语种英语
国家Egypt ; Japan
收录类别SCI-E
WOS记录号WOS:000363719600021
WOS关键词CLASSIFICATION ; DEPOSITS ; ROCKS
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/2XILL650/185942
作者单位1.Nucl Mat Author, Cairo, Egypt;
2.Kyushu Univ, Fac Engn, Fukuoka 812, Japan
推荐引用方式
GB/T 7714
Ibrahim, Mohamed El-Ahmady,Watanabe, Koichiro,Saleh, Gehad Mohamed,et al. Abu Rusheid lamprophyre dikes, South Eastern Desert, Egypt: as physical-chemical traps for REEs, Zn, Y, U, Cu, W, and Ag[J],2015,8(11):9261-9270.
APA Ibrahim, Mohamed El-Ahmady,Watanabe, Koichiro,Saleh, Gehad Mohamed,&Ibrahim, Waleed Saad.(2015).Abu Rusheid lamprophyre dikes, South Eastern Desert, Egypt: as physical-chemical traps for REEs, Zn, Y, U, Cu, W, and Ag.ARABIAN JOURNAL OF GEOSCIENCES,8(11),9261-9270.
MLA Ibrahim, Mohamed El-Ahmady,et al."Abu Rusheid lamprophyre dikes, South Eastern Desert, Egypt: as physical-chemical traps for REEs, Zn, Y, U, Cu, W, and Ag".ARABIAN JOURNAL OF GEOSCIENCES 8.11(2015):9261-9270.
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