Typology and microprobe analysis of zircons as an indicator to evolution and genesis of Abu El-Hasan granitoids, Northern-Eastern Desert, Egypt
Zircons from the older and the younger granitoids of Abu El-Hasan granitic complex are typologically and geochemically characterized. Zircon populations of the older granitoids contain a wide variety of crystal shapes and do not show any overgrowths, outgrowths or corrosion. Zircons of the younger g...
Elmentve itt :
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| Dokumentumtípus: | Cikk |
| Megjelent: |
University of Szeged, Department of Mineralogy, Geochemistry and Petrology
Szeged
1999
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| Sorozat: | Acta mineralogica-petrographica
40 |
| Kulcsszavak: | Kőzettan, Ásványtan, Földtan |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/24876 |
| Tartalmi kivonat: | Zircons from the older and the younger granitoids of Abu El-Hasan granitic complex are typologically and geochemically characterized. Zircon populations of the older granitoids contain a wide variety of crystal shapes and do not show any overgrowths, outgrowths or corrosion. Zircons of the younger granitoids show much more regularity in distribution. Typological evolutionary trends of the studied zircons are suggested with decreasing age which may indicate some evolution. Microprobe analyses were carried out for different zircons from the granitic rocks to clarify the magmatic evolution, the crystal building and the crystallization of this accessory mineral. Back Scatter Electron (BSE) images of zircons are utilized to reveal zonal growth, crystal effect of the aggressive hydrothermal solutions and inclusions. Chemical analyses were carried out from the core to the rim of the grains to deduce the variations through crystal growth and the magmatic evolution. Zr/Hf ratio is often between 40 and 30, but lower and higher values are also recorded. Generally, Zr/Hf ratio does not show clear trends from the core to the rim in the studied zircon. However, this ratio shows decreasing trend with differentiation for all the granitoids. |
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| Terjedelem/Fizikai jellemzők: | 21-44 |
| ISSN: | 0365-8066 |