干旱区生态环境知识资源中心(Arid): Mineralogical and Geochemical Aspects of Nubia Sandstons at Gabel El Ghurfa, Southeastern Desert, Egypt

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	Mineralogical and Geochemical Aspects of Nubia Sandstons at Gabel El Ghurfa, Southeastern Desert, Egypt
	Ibrahim, M. E.; Aly, G. M.; El-Tohamy, A. M.
通讯作者	Ibrahim, ME
来源期刊	ARAB JOURNAL OF NUCLEAR SCIENCES AND APPLICATIONS
ISSN	1110-0451
出版年	2012
卷号	45 期号:2 页码:117-129
英文摘要	Gabel El Ghurfa area is situated at the eastern part of Wadi Natash lies similar to 125 km ENE of Aswan and occupies some 130km2 of the exposed volcanics and Nubia sandstones. Gabel El Ghurfa forms a ring dyke (2km2) with a diameter of 1.2 km and composed mainly of normal and alkaline trachyte at the outer zone. The inner zone of the ring (600 m in diameter) is mainly represented by Lower Nubia sandstones (LNSS) and a minor trachyte plug. The LNSS is composed of conglomerate (at the base) followed by quartz arenite, greywacke and calcareous sandstone (at the top). The lower Nubia sandstones overlie the metasediments and overlain by the lower volcanic flows (alkali olivine basalt), whereas the Upper Nubia sandstones (UNSS) overlie the trachyte. The lower Nubia sandstones are characterized by uranium minerals (metaheinrichite, autunite and uranophane), sulfides and base metals (pyrite, galena, zincite, chromite, copper nickel, gold and silver) and accessories (e. g. zircon, monazite, spinel, sphene, fluorite, ilmenite, garnet, rutile and allanite) which confirmed by X-ray diffraction and ESEM analyses. The geochemical data of the bulk LNSS samples reflect the enrichment of SiO2, CaO, Zr, Ba, Sr, Ti, Cr and Ni. The LNSS deposited in semi-arid to semi-humid climatic conditions. Total rare earth elemental concentration of LNSS vary between 50 and 295 ppm. From the rare earth elements (REE) data, the LNSS are characterized by (1) enrichment in light rare earth element (LREE), (2) depletion in heavy rare earth element (HREE) relative to the light and (3) negative Eu-anomaly.
类型	Article
语种	英语
收录类别	ESCI
WOS记录号	WOS:000422533700011
WOS类目	Nuclear Science & Technology
WOS研究方向	Nuclear Science & Technology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/330158
作者单位	[Ibrahim, M. E.; Aly, G. M.; El-Tohamy, A. M.] Nucl Mat Author, Cairo, Egypt
推荐引用方式 GB/T 7714	Ibrahim, M. E.,Aly, G. M.,El-Tohamy, A. M.. Mineralogical and Geochemical Aspects of Nubia Sandstons at Gabel El Ghurfa, Southeastern Desert, Egypt[J],2012,45(2):117-129.
APA	Ibrahim, M. E.,Aly, G. M.,&El-Tohamy, A. M..(2012).Mineralogical and Geochemical Aspects of Nubia Sandstons at Gabel El Ghurfa, Southeastern Desert, Egypt.ARAB JOURNAL OF NUCLEAR SCIENCES AND APPLICATIONS,45(2),117-129.
MLA	Ibrahim, M. E.,et al."Mineralogical and Geochemical Aspects of Nubia Sandstons at Gabel El Ghurfa, Southeastern Desert, Egypt".ARAB JOURNAL OF NUCLEAR SCIENCES AND APPLICATIONS 45.2(2012):117-129.