Sequential deuteric and hydrothermal alterations in the Late Neoproterozoic Um Naggat rare metal-bearing granite, Central Eastern Desert, Egypt
Gamal-Adeen, I., Shahien, M.G., Zayed, A.M., Bakhit, B.R., Sanislav, I.V., and Abu Sharib, A.S.A.A. (2023) Sequential deuteric and hydrothermal alterations in the Late Neoproterozoic Um Naggat rare metal-bearing granite, Central Eastern Desert, Egypt. Journal of African Earth Sciences, 203. 104932.
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Abstract
The Late Neoproterozoic rare metal-bearing granite of Um Naggat pluton records deuteric and magmatic-hydrothermal fluid activities that culminated in overlapping sequential metasomatic alterations. The pluton is petrographically discriminated into subsolvus biotite, hypersolvus alkali-feldspar, and subsolvus albite granites. The residual fluid interacted and re-equilibrated with the mica and feldspars. Two phases of albitization, greisenization, chloritization and hematitization, and one phase of silicification, as well as microclinization are recognized. Compared to the alkali-feldspar and albite granites, the microclinization is restricted to the biotite granite, whereas greisenization and albitization increase in the former two granites and reaches their climax in the albite granite. Repeated contrasting acid-and alkaline-based alterations emphasize the fluctuation of the acidic-basic behavior of the fluid as a consequence of dominantly hydrogen-and alkali-exchange reactions.
| Item ID: | 78812 |
|---|---|
| Item Type: | Article (Research - C1) |
| ISSN: | 1879-1956 |
| Copyright Information: | Published Version: © 2023 Published by Elsevier Ltd. AAM may be made open access in an Institutional Repository under a CC BY-NC-ND license after a 24 month embargo. |
| Date Deposited: | 07 Jun 2023 00:08 |
| FoR Codes: | 37 EARTH SCIENCES > 3705 Geology > 370508 Resource geoscience @ 40% 37 EARTH SCIENCES > 3705 Geology > 370503 Igneous and metamorphic petrology @ 40% 37 EARTH SCIENCES > 3705 Geology > 370505 Mineralogy and crystallography @ 20% |
| SEO Codes: | 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280107 Expanding knowledge in the earth sciences @ 100% |
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