Arid
DOI10.1007/s12517-013-0963-9
U-series isotopic composition of kasolite associated with aplite-pegmatite at Jabal Sayid, Hijaz region, Kingdom of Saudi Arabia
Dawood, Yehia H.1; Abd El-Naby, Hamdy H.1; Ghaleb, Bassam2
通讯作者Dawood, Yehia H.
来源期刊ARABIAN JOURNAL OF GEOSCIENCES
ISSN1866-7511
EISSN1866-7538
出版年2014
卷号7期号:7页码:2881-2892
英文摘要

Uranium and thorium isotopic composition of kasolite [Pb(UO2)SiO4-(H2O)] from Jabal Sayid area was determined by thermal ionization mass spectrometry. Secondary electron imaging, back-scattered electron imaging, and energy dispersive spectral scans were used to investigate the mineralogical characteristics of this uranyl mineral phase. Distinct crystal faces and crystal growth of kasolite from the study area confirm mineral precipitation near the surface from the circulating groundwater. The obtained data were used to interpret the mechanism of uranium mobility in Jabal Sayid weathering profile and to construct a tentative model to explain the isotopic evolution of uranium and thorium. This model indicates that (1) uranium was leached at depth, (2) uranyl mineralization was precipitated along fractures and cavities in the host rocks during humid conditions and pluvial periods, (3) preferential leaching of U-234 from uranyl mineralization by recoil processes was continuous indicative of a weakly circulating groundwater, and (4) U-234-deficiency resulted in isotopic signatures characterized by low U-234/U-238 and high Th-230/U-234 ratios. The modification pattern of these activity ratios suggests that uranyl mineralization of Jabal Sayid, most probably, has been precipitated during the same Late Quaternary pluvial periods responsible for the formation of the corresponding mineralizations in the Eastern Desert of Egypt.


英文关键词Uranyl mineralization U-series Activity ratio Supergene deposits Arabian Nubian Shield
类型Article
语种英语
国家Saudi Arabia ; Canada
收录类别SCI-E
WOS记录号WOS:000338217500029
WOS关键词CENTRAL EASTERN DESERT ; SECONDARY URANIUM DEPOSITS ; PLUVIAL EPISODES ; WESTERN DESERT ; MINERALS ; AREA ; ORE ; AGE ; MINERALIZATION ; CONSTRAINTS
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/2XILL650/180786
作者单位1.King Abdulaziz Univ, Fac Earth Sci, Jeddah 21589, Saudi Arabia;
2.Univ Quebec Montreal, GEOTOP UQAM McGILL, Montreal, PQ H3C 3P, Canada
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GB/T 7714
Dawood, Yehia H.,Abd El-Naby, Hamdy H.,Ghaleb, Bassam. U-series isotopic composition of kasolite associated with aplite-pegmatite at Jabal Sayid, Hijaz region, Kingdom of Saudi Arabia[J],2014,7(7):2881-2892.
APA Dawood, Yehia H.,Abd El-Naby, Hamdy H.,&Ghaleb, Bassam.(2014).U-series isotopic composition of kasolite associated with aplite-pegmatite at Jabal Sayid, Hijaz region, Kingdom of Saudi Arabia.ARABIAN JOURNAL OF GEOSCIENCES,7(7),2881-2892.
MLA Dawood, Yehia H.,et al."U-series isotopic composition of kasolite associated with aplite-pegmatite at Jabal Sayid, Hijaz region, Kingdom of Saudi Arabia".ARABIAN JOURNAL OF GEOSCIENCES 7.7(2014):2881-2892.
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