Arid
DOI10.1007/s00126-007-0171-1
Genesis of secondary uranium minerals associated with jasperoid veins, El Erediya area, Eastern Desert, Egypt
Abd El-Naby, Hamdy H.
通讯作者Abd El-Naby, Hamdy H.
来源期刊MINERALIUM DEPOSITA
ISSN0026-4598
EISSN1432-1866
出版年2008
卷号43期号:8页码:933-944
英文摘要

Uranium mineralization in the El Erediya area, Egyptian Eastern Desert, has been affected by both high temperature and low temperature fluids. Mineralization is structurally controlled and is associated with jasperoid veins that are hosted by a granitic pluton. This granite exhibits extensive alteration, including silicification, argillization, sericitization, chloritization, carbonatization, and hematization. The primary uranium mineral is pitchblende, whereas uranpyrochlore, uranophane, kasolite, and an unidentified hydrated uranium niobate mineral are the most abundant secondary uranium minerals. Uranpyrochlore and the unidentified hydrated uranium niobate mineral are interpreted as alteration products of petscheckite. The chemical formula of the uranpyrochlore based upon the Electron Probe Micro Analyzer (EPMA) is where U and Nb represent the dominant cations in the U and Nb site, respectively. Uranophane is the dominant U6+ silicate phase in oxidized zones of the jasperoid veins. Kasolite is less abundant than uranophane and contains major U, Pb, and Si but only minor Ca, Fe, P, and Zr. A two-stage metallogenetic model is proposed for the alteration processes and uranium mineralization at El Erediya. The primary uranium minerals were formed during the first stage of the hydrothermal activity that formed jasperoid veins in El Eradiya granite (130-160 Ma). This stage is related to the Late Jurassic-Early Cretaceous phase of the final Pan-African tectono-thermal event in Egypt. After initial formation of El Erediya jasperoid veins, a late stage of hydrothermal alteration includes argillization, dissolution of iron-bearing sulfide minerals, formation of iron-oxy hydroxides, and corrosion of primary uranium minerals, resulting in enrichment of U, Ca, Pb, Zr, and Si. During this stage, petscheckite was altered to uranpyrochlore and oxy-petscheckite. Uranium was likely transported as uranyl carbonate and uranyl fluoride complexes. With change of temperature and pH, these complexes became unstable and combined with silica, calcium, and lead to form uranophane and kasolite. Finally, at a later stage of low-temperature supergene alteration, oxy-petscheckite was altered to an unidentified hydrated uranium niobate mineral by removal of Fe.


英文关键词Egypt El Erediya Uranpyrochlore Uranium niobate Uranophane Kasolite
类型Article
语种英语
国家Egypt
收录类别SCI-E
WOS记录号WOS:000260665600006
WOS关键词ACCESSORY MINERALS ; GEOCHEMISTRY ; ORIGIN ; MINERALIZATION ; PYROCHLORES ; MAGMATISM ; COMPLEXES ; DEPOSITS ; BEARING
WOS类目Geochemistry & Geophysics ; Mineralogy
WOS研究方向Geochemistry & Geophysics ; Mineralogy
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/158575
作者单位Nucl Mat Author, Cairo, Egypt
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GB/T 7714
Abd El-Naby, Hamdy H.. Genesis of secondary uranium minerals associated with jasperoid veins, El Erediya area, Eastern Desert, Egypt[J],2008,43(8):933-944.
APA Abd El-Naby, Hamdy H..(2008).Genesis of secondary uranium minerals associated with jasperoid veins, El Erediya area, Eastern Desert, Egypt.MINERALIUM DEPOSITA,43(8),933-944.
MLA Abd El-Naby, Hamdy H.."Genesis of secondary uranium minerals associated with jasperoid veins, El Erediya area, Eastern Desert, Egypt".MINERALIUM DEPOSITA 43.8(2008):933-944.
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