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- Title
Rare Metal Distribution and Mineralization Potentiality of Pegmatites in Gabal El Fereyid Granite, South Eastern Desert, Egypt.
- Authors
Bahaa, M. E.; Gehad, M. S.; Maher, I. D.; Hassan, A. S.; Khaleal, F. M.
- Abstract
Gabal El Fereyid area, represents a promising area for monzogranite and pegmatites hosted rare-metal mineralization. Microscopically, monzogranite and pegmatites consist of K-feldspar, albite, and quartz with few biotite +/– hornblende. The radiometric studies of anomalous pegmatite samples show that their eU-contents reached up to 149 ppm while their eTh-contents reached up to 375 ppm, in contrast the eU and eTh contents of monzogranite range from 1 to 5.7 ppm and from 4.2 to 29.1 ppm, respectively. This indicates strong post-magmatic U-enrichment in the pegmatitic melt, due to the presence of radioactive minerals as thorite, uranothorite, fergusonite, samarskite and ishikawit. U and Th mineralization in pegmatites are discriminated as hydrothermal and magmatic types. Pegmatites show enrichment of large ion lithophile elements (LILE; Pb and Rb,), high field strength elements (HFSE; Y, Zr, Th, U, Nb and Ta) and rare earth elements but depleted in K, P, Sr, Cs, Ba and Ti. Pegmatites indicate moderate to large negative Eu anomaly and show clear W-type tetrad effect of the REE.
- Subjects
EGYPT; NONFERROUS metals; PEGMATITES; RARE earth metals; RADIOACTIVE substances; MINERALIZATION; ALKALI metals; TRACE elements
- Publication
Geochemistry International, 2020, Vol 58, Issue 7, p802
- ISSN
0016-7029
- Publication type
Article
- DOI
10.1134/S0016702920070034