Homrit Akarem Post-Collisional Intrusion, Southeastern Desert, Egypt: Petrogenesis of Greisen Formed in a Cupola Structure and Enrichment in Strategic Minerals
The greisens discussed in the present study are associated with the Homrit Akarem post-collisional granites, which are exposed near the western edge of the Egyptian Nubian Shield in the Southeastern Desert of Egypt. The Homrit Akarem granites intruded into Neoproterozoic country rocks, with sharp in...
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2025-05-01
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| author | Mokhles K. Azer Adel A. Surour Hilmy E. Moussa Ayman E. Maurice Mabrouk Sami Moustafa A. Abou El Maaty Adel I. M. Akarish Mohamed Th. S. Heikal Ahmed A. Elnazer Mustafa A. Elsagheer Heba S. Mubarak Amany M. A. Seddik Hadeer Sobhy Mohamed O. Osama |
| author_facet | Mokhles K. Azer Adel A. Surour Hilmy E. Moussa Ayman E. Maurice Mabrouk Sami Moustafa A. Abou El Maaty Adel I. M. Akarish Mohamed Th. S. Heikal Ahmed A. Elnazer Mustafa A. Elsagheer Heba S. Mubarak Amany M. A. Seddik Hadeer Sobhy Mohamed O. Osama |
| author_sort | Mokhles K. Azer |
| collection | DOAJ |
| description | The greisens discussed in the present study are associated with the Homrit Akarem post-collisional granites, which are exposed near the western edge of the Egyptian Nubian Shield in the Southeastern Desert of Egypt. The Homrit Akarem granites intruded into Neoproterozoic country rocks, with sharp intrusive contacts. The marginal parts of the Homrit Akarem intrusion underwent extensive post-magmatic metasomatism, resulting in the formation of albitized granite and greisens. The Homrit Akarem greisens occur as veins and stockworks, which can be classified into four types: muscovite-rich, cassiterite-rich, topaz-rich, and beryl-rich greisens. Based on petrographic inspection, we identified ore minerals (cassiterite, beryl, topaz, muscovite, Nb-Ta oxides, tourmaline, fluorite, and corundum) in the greisens using electron probe microanalysis. The Homrit Akarem mineralized greisens were formed in a magmatic cupola above A-type magma, where fluid–rock interactions played a significant role in their formation. The accumulation of residual volatile-rich melt and exsolved fluids in the apical part of the magma chamber produced albitized granite, greisens, and quartz veins that intruded into the peripheries of the granitic intrusion and its surrounding country rocks. The variation in the mineralogy of the studied greisens indicates the diverse chemical composition of both the hydrothermal/magmatic fluids and the host granites. The simultaneous decrease in temperature and pressure is considered a crucial factor that controlled mineralization in the apical parts of the magma chamber. The occurrence of cassiterite, beryl, topaz, tourmaline, muscovite, and Nb-Ta oxides in the studied greisens suggests a potential polymetallic deposit of industrial minerals. |
| format | Article |
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| institution | Kabale University |
| issn | 2076-3263 |
| language | English |
| publishDate | 2025-05-01 |
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| spelling | doaj-art-742a6842e886457a9cdf4e76f8a528b92025-08-20T03:27:14ZengMDPI AGGeosciences2076-32632025-05-0115620010.3390/geosciences15060200Homrit Akarem Post-Collisional Intrusion, Southeastern Desert, Egypt: Petrogenesis of Greisen Formed in a Cupola Structure and Enrichment in Strategic MineralsMokhles K. Azer0Adel A. Surour1Hilmy E. Moussa2Ayman E. Maurice3Mabrouk Sami4Moustafa A. Abou El Maaty5Adel I. M. Akarish6Mohamed Th. S. Heikal7Ahmed A. Elnazer8Mustafa A. Elsagheer9Heba S. Mubarak10Amany M. A. Seddik11Hadeer Sobhy12Mohamed O. Osama13Geological Sciences Department, National Research Centre, Dokki 12622, EgyptDepartment of Geological Sciences, Faculty of Science, Galala University, Suez 43511, EgyptGeological Sciences Department, National Research Centre, Dokki 12622, EgyptGeology Department, Faculty of Science, Helwan University, Cairo 11790, EgyptGeosciences Department, College of Science, United Arab Emirates University, Al Ain 15551, United Arab EmiratesGeological Sciences Department, National Research Centre, Dokki 12622, EgyptGeological Sciences Department, National Research Centre, Dokki 12622, EgyptGeology Department, Faculty of Science, Tanta University, Tanta 31733, EgyptGeological Sciences Department, National Research Centre, Dokki 12622, EgyptGeological Sciences Department, National Research Centre, Dokki 12622, EgyptGeological Sciences Department, National Research Centre, Dokki 12622, EgyptGeology Department, Faculty of Science, New Valley University, El-Kharga 72511, EgyptGeology Department, Faculty of Science, Zagazig University, Zagazig 44519, EgyptNuclear Materials Authority, El Maadi, P.O. Box 530, Cairo 11742, EgyptThe greisens discussed in the present study are associated with the Homrit Akarem post-collisional granites, which are exposed near the western edge of the Egyptian Nubian Shield in the Southeastern Desert of Egypt. The Homrit Akarem granites intruded into Neoproterozoic country rocks, with sharp intrusive contacts. The marginal parts of the Homrit Akarem intrusion underwent extensive post-magmatic metasomatism, resulting in the formation of albitized granite and greisens. The Homrit Akarem greisens occur as veins and stockworks, which can be classified into four types: muscovite-rich, cassiterite-rich, topaz-rich, and beryl-rich greisens. Based on petrographic inspection, we identified ore minerals (cassiterite, beryl, topaz, muscovite, Nb-Ta oxides, tourmaline, fluorite, and corundum) in the greisens using electron probe microanalysis. The Homrit Akarem mineralized greisens were formed in a magmatic cupola above A-type magma, where fluid–rock interactions played a significant role in their formation. The accumulation of residual volatile-rich melt and exsolved fluids in the apical part of the magma chamber produced albitized granite, greisens, and quartz veins that intruded into the peripheries of the granitic intrusion and its surrounding country rocks. The variation in the mineralogy of the studied greisens indicates the diverse chemical composition of both the hydrothermal/magmatic fluids and the host granites. The simultaneous decrease in temperature and pressure is considered a crucial factor that controlled mineralization in the apical parts of the magma chamber. The occurrence of cassiterite, beryl, topaz, tourmaline, muscovite, and Nb-Ta oxides in the studied greisens suggests a potential polymetallic deposit of industrial minerals.https://www.mdpi.com/2076-3263/15/6/200Egyptian Nubian Shieldpost-collisionalrare metal-bearing granitealbitizationgreisenization |
| spellingShingle | Mokhles K. Azer Adel A. Surour Hilmy E. Moussa Ayman E. Maurice Mabrouk Sami Moustafa A. Abou El Maaty Adel I. M. Akarish Mohamed Th. S. Heikal Ahmed A. Elnazer Mustafa A. Elsagheer Heba S. Mubarak Amany M. A. Seddik Hadeer Sobhy Mohamed O. Osama Homrit Akarem Post-Collisional Intrusion, Southeastern Desert, Egypt: Petrogenesis of Greisen Formed in a Cupola Structure and Enrichment in Strategic Minerals Geosciences Egyptian Nubian Shield post-collisional rare metal-bearing granite albitization greisenization |
| title | Homrit Akarem Post-Collisional Intrusion, Southeastern Desert, Egypt: Petrogenesis of Greisen Formed in a Cupola Structure and Enrichment in Strategic Minerals |
| title_full | Homrit Akarem Post-Collisional Intrusion, Southeastern Desert, Egypt: Petrogenesis of Greisen Formed in a Cupola Structure and Enrichment in Strategic Minerals |
| title_fullStr | Homrit Akarem Post-Collisional Intrusion, Southeastern Desert, Egypt: Petrogenesis of Greisen Formed in a Cupola Structure and Enrichment in Strategic Minerals |
| title_full_unstemmed | Homrit Akarem Post-Collisional Intrusion, Southeastern Desert, Egypt: Petrogenesis of Greisen Formed in a Cupola Structure and Enrichment in Strategic Minerals |
| title_short | Homrit Akarem Post-Collisional Intrusion, Southeastern Desert, Egypt: Petrogenesis of Greisen Formed in a Cupola Structure and Enrichment in Strategic Minerals |
| title_sort | homrit akarem post collisional intrusion southeastern desert egypt petrogenesis of greisen formed in a cupola structure and enrichment in strategic minerals |
| topic | Egyptian Nubian Shield post-collisional rare metal-bearing granite albitization greisenization |
| url | https://www.mdpi.com/2076-3263/15/6/200 |
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