Arid
DOI10.1016/j.apgeochem.2008.09.011
Natural attenuation of uranium and formation of autunite at the expense of apatite within an oxidizing environment, south Eastern Desert of Egypt
El-Naby, Hamdy H. Abd1,2; Dawood, Yehia H.1,3
通讯作者El-Naby, Hamdy H. Abd
来源期刊APPLIED GEOCHEMISTRY
ISSN0883-2927
出版年2008
卷号23期号:12页码:3741-3755
英文摘要

X-ray diffraction (XRD), back scattered electron imaging (BSE), wavelength-dispersion spectral scan (WDS), X-ray compositional mapping and quantitative electron probe micro analyses (EPMA) have been used to examine a natural attenuation of U during low temperature alteration of the Sela granite, south Eastern Desert of Egypt. The data confirmed that a pre-existing hydroxyapatite was transformed to autunite through an unidentified intermediate phase. The boundaries between these three phases are not sharp and are generally interfering indicative of the replacement of Ca by U. The hydroxyapatite, intermediate phase and autunite show similar chondrite normalized rare earth elements (REE) patterns suggesting a genetic relationship. Alteration processes have enriched the three phases with heavy rare earth elements (HREE) and Eu and caused Ce, Dy and Yb negative anomalies. Based on the pH of the aqueous solutions, two mechanisms may explain the conversion of hydroxyapatite to autunite: (1) the dissolution of hydroxyapatite and precipitation of autunite which would happen when the uranyl bearing solutions were acidic enough (pH = 3-6.8) to be able to dissolve the pre-existing hydroxyapatite and (2) sorption of the uranyl ion on the surface of hydroxyapatite followed by substitution Of (UO2)(2+) at the expense of Ca2+. The latter mechanism would have happened if the pH of the aqueous solutions were near neutral and at low dissolved concentrations of uranyl ion. The genesis of uranyl mineralization in the Sela area supports the use of apatite-based technologies for U remediation in an oxidizing environment. (c) 2008 Elsevier Ltd. All rights reserved.


类型Article
语种英语
国家Saudi Arabia ; Egypt
收录类别SCI-E
WOS记录号WOS:000261963700038
WOS关键词RARE-EARTH-ELEMENTS ; CRYSTAL-CHEMISTRY ; COMPLEX-FORMATION ; HYDROXYAPATITE ; GROUNDWATER ; ORE ; SOLUBILITY ; SPECIATION ; CARBONATE ; MINERALS
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/156461
作者单位1.King Abdul Aziz Univ, Fac Earth Sci, Jeddah 21589, Saudi Arabia;
2.Nucl Mat Author, Cairo, Egypt;
3.Ain Shams Univ, Fac Sci, Dept Geol, Cairo, Egypt
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El-Naby, Hamdy H. Abd,Dawood, Yehia H.. Natural attenuation of uranium and formation of autunite at the expense of apatite within an oxidizing environment, south Eastern Desert of Egypt[J],2008,23(12):3741-3755.
APA El-Naby, Hamdy H. Abd,&Dawood, Yehia H..(2008).Natural attenuation of uranium and formation of autunite at the expense of apatite within an oxidizing environment, south Eastern Desert of Egypt.APPLIED GEOCHEMISTRY,23(12),3741-3755.
MLA El-Naby, Hamdy H. Abd,et al."Natural attenuation of uranium and formation of autunite at the expense of apatite within an oxidizing environment, south Eastern Desert of Egypt".APPLIED GEOCHEMISTRY 23.12(2008):3741-3755.
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