干旱区生态环境知识资源中心(Arid): Mineralogy and Geochemistry of Uraniferous Sandstones in Fault Zone, Wadi El Sahu Area, Southwestern Sinai, Egypt: Implications for Provenance, Weathering and Tectonic Setting

Arid

DOI	10.1111/1755-6724.14613
	Mineralogy and Geochemistry of Uraniferous Sandstones in Fault Zone, Wadi El Sahu Area, Southwestern Sinai, Egypt: Implications for Provenance, Weathering and Tectonic Setting
	Sallam, Osama R.; Mira, Hamed I.; El Tohamy, Amira M.; Abbas, Abd Elhadi A.
通讯作者	El Tohamy, AM (corresponding author), Nucl Mat Author, POB 530, El Maadi Cairo, Egypt.
来源期刊	ACTA GEOLOGICA SINICA-ENGLISH EDITION
ISSN	1000-9515
EISSN	1755-6724
出版年	2021
卷号	95 期号:3 页码:830-845
英文摘要	Paleozoic rocks in the Wadi El Sahu area are affected by many major faults in different directions. A reverse fault trending NE-SW is exposed for about 300 m of its length as it cuts through the Abu Hamata and Adedia formations on the south side of Wadi El Sahu. A secondary ascending hydrothermal solution carrying heavy metals and radioactive minerals passed through the fault plain and the surrounding fractures, forming mineralized and radioactive zone. The mineralized zone thickness ranges from 60 cm to 200 cm along the fault plain. These rocks were analyzed radiometrically using a portable gamma-ray spectrometer, chemically by employing ICP-ES and ICP-MS, as well as mineralogically by both binocular and Environmental Scanning Electron microscope. Gold content was also determined by fire assay. REE and U contents reached up to 2682 and 1216 ppm, respectively. Mineralogical investigations indicated the presence of uraninite, torbernite, autunite, sklodowskite, kasolite as uranium minerals, thorite as a thorium mineral, monazite, allanite and xenotime as REE-bearing minerals, zircon and columbite as accessory minerals, gold and nickel as precious and base metals, in addition to cassiterite, chalcopyrite, chalcocite and chrysocolla. High REE and U contents are attributed to the circulation of epigenetic U and REE-bearing hydrothermal solutions along the fault plain and its surrounding fractures. Hydrothermal alteration processes could then be confirmed by the presence of the M-type tetrad effect in the REE-patterns of the ferruginous sandstone. The non-chondritic ratio of Nb/Ta, Zr/Hf and Y/Ho in the studied sandstone may be attributed to the tetrad effect. The Ce and Eu anomaly with unusual REE-patterns was represented by the presence of conjugated M-W tetrad effects, indicating either the dual effect of hydrothermal solutions or groundwater with seawater. The results clarify that the tetrad-effects could be used as evidence for the environment of deposition and as an indication for gold mineralization.
英文关键词	uranium gold RREs tetrad effect
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000667267600009
WOS关键词	RARE-EARTH-ELEMENTS ; SOUTH EASTERN DESERT ; ZR-HF ; NB-TA ; MAJOR-ELEMENT ; SHALES ; FRACTIONATION ; CHEMISTRY ; EVOLUTION ; GRANITES
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/2XILL650/349260
作者单位	[Sallam, Osama R.; Mira, Hamed I.; El Tohamy, Amira M.; Abbas, Abd Elhadi A.] Nucl Mat Author, POB 530, El Maadi Cairo, Egypt
推荐引用方式 GB/T 7714	Sallam, Osama R.,Mira, Hamed I.,El Tohamy, Amira M.,et al. Mineralogy and Geochemistry of Uraniferous Sandstones in Fault Zone, Wadi El Sahu Area, Southwestern Sinai, Egypt: Implications for Provenance, Weathering and Tectonic Setting[J],2021,95(3):830-845.
APA	Sallam, Osama R.,Mira, Hamed I.,El Tohamy, Amira M.,&Abbas, Abd Elhadi A..(2021).Mineralogy and Geochemistry of Uraniferous Sandstones in Fault Zone, Wadi El Sahu Area, Southwestern Sinai, Egypt: Implications for Provenance, Weathering and Tectonic Setting.ACTA GEOLOGICA SINICA-ENGLISH EDITION,95(3),830-845.
MLA	Sallam, Osama R.,et al."Mineralogy and Geochemistry of Uraniferous Sandstones in Fault Zone, Wadi El Sahu Area, Southwestern Sinai, Egypt: Implications for Provenance, Weathering and Tectonic Setting".ACTA GEOLOGICA SINICA-ENGLISH EDITION 95.3(2021):830-845.