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DOI | 10.1016/j.jafrearsci.2017.08.002 |
Phanerozoic extensional faulting and alteration control on uranium mineralization in trachytes of the Central Eastern Desert of Egypt | |
Hamdy, Mohamed M.1; Waheeb, Anton G.2; Aly, Samir M.1; Farag, Nagdy M.2; Sadek, Adel F.2 | |
通讯作者 | Hamdy, Mohamed M. |
来源期刊 | JOURNAL OF AFRICAN EARTH SCIENCES |
ISSN | 1464-343X |
EISSN | 1879-1956 |
出版年 | 2017 |
卷号 | 136页码:282-304 |
英文摘要 | The Gabal Nasb El Atshan Upper Carboniferous-Lower Permian altered trachytes include uranium up to 3165 ppm. The paleostress and resolved shear stress analyses of the deformation systems in Gabal Nasb El Atshan area indicate that the trachyte was subjected to WNW-ESE to E-W tensile shear stress directed extensional regimes. The low-stress regions in the vicinity of extensional faults and their associated joints were favorable locations for fluid flow and the consequence alteration and U-mineralization. This occurred more extensively along the contacts between the sills of trachyte and the Hammamat sedimentary rocks; where the latter acted as a physical barrier for the alteration fluids migration outward. Alteration styles include albitization, aegirinization, arfvedsonization, chloritization and ferruginisation. The albitization is the most common sodic metasomatism, giving sanidine from Or(98.8)Abo(3) to Or(623)Ab(376), anorthoclase from Or(51.4)Ab(48.0) to Or(12.2)Ab(87.6) and albite from OrmoAbso,o to Or(0,8)Ab(99.2). Aegirine and arfvedsonite formed due to decreasing sodium activity in the metasomatic fluids. Sodic metasomatism may be the source of uranium-enrichment, taking place during the late magmatic to deuteric processes. This was followed by a retrograde alteration of chloritization between 175 and 42 degrees C toward precipitation of Fe-oxides and alteration of primary uranium. Surficial low-temperature alteration remobilized and redistributed the produced uranylhydroxides and ferruginisation caused the reduction and adsorption of U forming betafite, uranophane, soddyite, umohoite, uranotile and uranopilite. (C) 2017 Elsevier Ltd. All rights reserved. |
英文关键词 | Uraniferous trachyte sills WNW-ESE to E-W extension Deuteric to retrograde uranium enrichment Surficial low-temperature mineralization Gabal Nasb El Atshan Central Eastern Desert of Egypt |
类型 | Article |
语种 | 英语 |
国家 | Egypt |
收录类别 | SCI-E |
WOS记录号 | WOS:000418219400020 |
WOS关键词 | STRIATED FAULTS ; STRESS ; MINERALS ; PETROGENESIS ; NOMENCLATURE ; AMPHIBOLES ; EVOLUTION ; INVERSION ; BASEMENT ; COMPLEX |
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/2XILL650/199969 |
作者单位 | 1.Tanta Univ, Fac Sci, Geol Dept, Tanta 31527, Egypt; 2.Nucl Mat Author, POB 530, Cairo, Egypt |
推荐引用方式 GB/T 7714 | Hamdy, Mohamed M.,Waheeb, Anton G.,Aly, Samir M.,et al. Phanerozoic extensional faulting and alteration control on uranium mineralization in trachytes of the Central Eastern Desert of Egypt[J],2017,136:282-304. |
APA | Hamdy, Mohamed M.,Waheeb, Anton G.,Aly, Samir M.,Farag, Nagdy M.,&Sadek, Adel F..(2017).Phanerozoic extensional faulting and alteration control on uranium mineralization in trachytes of the Central Eastern Desert of Egypt.JOURNAL OF AFRICAN EARTH SCIENCES,136,282-304. |
MLA | Hamdy, Mohamed M.,et al."Phanerozoic extensional faulting and alteration control on uranium mineralization in trachytes of the Central Eastern Desert of Egypt".JOURNAL OF AFRICAN EARTH SCIENCES 136(2017):282-304. |
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