Geochemical aspects and origin of tin-bearing granites in the Eastern Desert, Egypt
Three granitic plutons belonging to the younger granite province in the Eastern Desert of Egypt were selected for detailed penological and geochemical studies. These granatic masses (Homr Akarem, Igla and Mueilha) are associated with Sn-W-Mo-F mineralization and selectively affected by post-magmatic...
Elmentve itt :
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| Dokumentumtípus: | Cikk |
| Megjelent: |
University of Szeged, Department of Mineralogy, Geochemistry and Petrology
Szeged
1995
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| Sorozat: | Acta mineralogica-petrographica
36 |
| Kulcsszavak: | Kőzettan, Ásványtan, Földtan |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/24823 |
| Tartalmi kivonat: | Three granitic plutons belonging to the younger granite province in the Eastern Desert of Egypt were selected for detailed penological and geochemical studies. These granatic masses (Homr Akarem, Igla and Mueilha) are associated with Sn-W-Mo-F mineralization and selectively affected by post-magmatic albitization and greisenization processes. The granitic rocks of the three plutons have alkaline affinity with some metaluminous to moderately peraluminous character. They show pronounced enrichment in Sn, Nb, W, Rb, Y, Zr, Be, Zn and Ga coupled with moderate depletion in Ca, Mg, Fe, Ti, Sr, Ba, Eu and elemental ratios Ba/Sr and K/Rb. These chemical aspects are consistent with the metallogenetically specialized granites that elsewhere are often associated with deposits of Sn, W, Mo and rare metals. Despite the close similiarity of the studied granites with the intra-plate magmatism, yet the field occurence and many chemical features of post-collision granites are considered. The origin of these granitic rocks is largely controlled by low-pressure crystal-melt fractionation from a source close to a within-plate magma. Although, the mineral fractionation could explain the rock chemistry, the abundances of HFS elements and HREE require the contribution of a fluorine-bearing fluid phase at a late stage of differentiation. These chemical features characterize the widespread metasomatic alteration and represent the potential economic source of Sn-W-Mo-F in the granitic rocks. The role of crustal contamination on such granites neither proved nor being exluded due to the lack of isotopic data. |
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| Terjedelem/Fizikai jellemzők: | 55-72 |
| ISSN: | 0365-8066 |