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DOI | 10.1016/j.jafrearsci.2018.03.031 |
Fluid evolution of Au-Cu zones in Urn Balad area, North Eastern Desert of Egypt: Implications from mineral chemistry and fluid inclusions | |
Abd El Monsef, Mohamed1,2; Salem, Ibrahim1; Slobodnik, Marek2; Ragab, Ahmed3 | |
通讯作者 | Abd El Monsef, Mohamed |
来源期刊 | JOURNAL OF AFRICAN EARTH SCIENCES
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ISSN | 1464-343X |
EISSN | 1879-1956 |
出版年 | 2018 |
卷号 | 143页码:321-338 |
英文摘要 | Scanning electron microscope (SEM), Electron microprobe (EMPA) and fluid inclusion studies of the ore body, as well as geochemical analyses of country rocks were performed to determine the nature and characteristics of the mineralizing fluid responsible for Au-Cu deposits in Um Balad area, Northern Eastern Desert of Egypt. The Urn Balad Au-Cu deposits are confined to well developed-quartz veins and veinlets cutting through the hosting country rocks. Petrographic and geochemical investigations of the hosting rocks distinguished between two main rock units; 1) metagabbro-diorite rocks with tholeiitic nature derived in island arc/continental margin tectonic regime, and 2) granodiorite rocks formed from calc-alkaline magma in continental margin regime. Wallrock alterations are represented by propylitic and argillic types. The mineralized quartz veins are striking in NE-SW direction and dipping between (35 degrees-45 degrees) in SE direction, other mineralized mafic dykes enriched with auriferous quartz veinlets are trending NE-SW and dipping 70 degrees/SE. The main ore minerals are represented by gold, chalcopyrite, pyrite, sphalerite, malachite, covellite and goethite. While, geffroyite, cuprite, chrysocolla, pseudomalachite, britholite, wolframite, scheelite, hematite and rutile are detected as minor constituents. Fluid inclusions microthermometry and isochore calculations combined with chlorite geothermometry revealed that the Urn Balad deposits were formed at temperature ranging from 305 degrees C to 325 degrees C and pressure between (100-500 bar). The mineralization had been developed in the shallow levels, beneath the water table at depth of 350-1760 m, rather than common mesothermal vein-type deposits in Egypt. Magmatic water have been suggested as the main source for the mineralized fluid. The transportation of the gold metal seems to be happen as bisulfide complexes in moderately acidic environment. The deposition was resulted from combination of changes in physico-chemical parameters, temperature and pressure plus the instability of the reduced sulfur complexes. A contamination with metamorphic and/or meteoric water was also proposed that has strong influence during the depositional process. (C) 2018 Elsevier Ltd. All rights reserved. |
英文关键词 | Intrusion-related deposits Geochemistry EMPA Fluid inclusions Urn Balad Egypt |
类型 | Article |
语种 | 英语 |
国家 | Egypt ; Czech Republic |
收录类别 | SCI-E |
WOS记录号 | WOS:000442331500024 |
WOS关键词 | GOLD DEPOSIT ; SOUTHERN SINAI ; NUBIAN SHIELD ; GENETIC MODEL ; CLASSIFICATION ; TEMPERATURE ; SOLUBILITY ; AFRICA |
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/2XILL650/210390 |
作者单位 | 1.Tanta Univ, Fac Sci, Dept Geol, Tanta 31527, Egypt; 2.Masaryk Univ, Fac Sci, Inst Geol Sci, Brno, Czech Republic; 3.Egyptian Mineral Resources Author, Cairo, Egypt |
推荐引用方式 GB/T 7714 | Abd El Monsef, Mohamed,Salem, Ibrahim,Slobodnik, Marek,et al. Fluid evolution of Au-Cu zones in Urn Balad area, North Eastern Desert of Egypt: Implications from mineral chemistry and fluid inclusions[J],2018,143:321-338. |
APA | Abd El Monsef, Mohamed,Salem, Ibrahim,Slobodnik, Marek,&Ragab, Ahmed.(2018).Fluid evolution of Au-Cu zones in Urn Balad area, North Eastern Desert of Egypt: Implications from mineral chemistry and fluid inclusions.JOURNAL OF AFRICAN EARTH SCIENCES,143,321-338. |
MLA | Abd El Monsef, Mohamed,et al."Fluid evolution of Au-Cu zones in Urn Balad area, North Eastern Desert of Egypt: Implications from mineral chemistry and fluid inclusions".JOURNAL OF AFRICAN EARTH SCIENCES 143(2018):321-338. |
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