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| DOI | 10.1007/s12517-019-4394-0 |
| Mineralogy and geochemistry of the Sikait U-Au-bearing lamprophyre dyke, South Eastern Desert, Egypt | |
| El Tohamy, Amira Mohammed | |
| 通讯作者 | El Tohamy, Amira Mohammed |
| 来源期刊 | ARABIAN JOURNAL OF GEOSCIENCES
 |
| ISSN | 1866-7511 |
| EISSN | 1866-7538 |
| 出版年 | 2019 |
| 卷号 | 12期号:7 |
| 英文摘要 | A 150-m-long mineralized lamprophyre dyke intrudes mylonite-melange at the eastern side of Wadi Sikait and granite at its western side. Its petrographic, mineral, and geochemical characteristics were investigated in order to determine its genetic history as well as the petrogensis of the hosted mineralizations. Rocks of the Sikait lamprophyre dyke have a porphyritic and, less commonly, aphanitic texture. They consist of REEs-U-Th- and Nb, Ta-bearing minerals in addition to Au and native nickel, zircon, and fluorite. The ratios of LREEs to each of the HREEs, MREEs, and HFSE are relatively high. The U and Th contents in the part of the dyke existing in granite are slightly high than those in that hosted by the mylonite-melange. The Sikait lamprophyre dyke has a calc-alkaline affinity and metaluminous to peraluminous. Its parent melts were derived from a mantle metasomatised by carbonatitic fluids. The protolith was subjected to slight to moderate partial melting in shallow to intermediate depths. During the emplacement of the dyke, U was released from its mineral precursors, transported, and redeposited under favorable condition. Its concentration in the part of the dyke hosted by granite was increased by the action of young surficial processes. On the other hand, Au was derived from the ophiolitic metagabbros and serpentinites that over thursted on the mylonites. It was precipitated from mesothermal and epithermal solutions. The Sikait dyke was affected by several alteration processes; the most common of which is hematitization and metasomatic carbonatization. |
| 英文关键词 | Egypt Eastern Desert Sikait Lamprophyre dyke Uranium REEs Gold |
| 类型 | Article |
| 语种 | 英语 |
| 国家 | Egypt |
| 收录类别 | SCI-E |
| WOS记录号 | WOS:000462143500005 |
| WOS关键词 | VOLCANIC-ROCKS ; ULTRAMAFIC LAMPROPHYRES ; ISOTOPIC CONSTRAINTS ; ALKALINE ; MANTLE ; PETROLOGY ; LEUKOGRANITE ; CARBONATITE ; LHERZOLITE ; MAGMATISM |
| 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/2XILL650/214319 |
| 作者单位 | Nucl Mat Author, POB 530, Cairo, Egypt |
| 推荐引用方式 GB/T 7714 | El Tohamy, Amira Mohammed. Mineralogy and geochemistry of the Sikait U-Au-bearing lamprophyre dyke, South Eastern Desert, Egypt[J],2019,12(7). |
| APA | El Tohamy, Amira Mohammed.(2019).Mineralogy and geochemistry of the Sikait U-Au-bearing lamprophyre dyke, South Eastern Desert, Egypt.ARABIAN JOURNAL OF GEOSCIENCES,12(7). |
| MLA | El Tohamy, Amira Mohammed."Mineralogy and geochemistry of the Sikait U-Au-bearing lamprophyre dyke, South Eastern Desert, Egypt".ARABIAN JOURNAL OF GEOSCIENCES 12.7(2019). |
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