CONTRIBUTION TO GEOLOGY AND URANIUM DISTRIBUTION OF SOME BASEMENT ROCKS IN EL-MUEILHA AREA, SOUTH EASTERN DESERT, EGYPT | ||||
| Nuclear Sciences Scientific Journal | ||||
| Article 6, Volume 7, Issue 1, 2018, Page 101-123 PDF (4.85 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/nssj.2018.30733 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| TAREK F. MOHAMMADEN; NAGDY M. F. ABDOU; MAHMOUD M. BADRAN | ||||
| Nuclear Materials Authority,Cairo, Egypt | ||||
| Abstract | ||||
| Metadacite is composed of phenocrysts of plagioclase, quartz, K-feldspar, hornblende and, in less order, biotite. These minerals are embedded in ground mass of felsic and mafic minerals forming the porphyroblast texture. The meta-andesite is mainly composed of plagioclase, hornblende and quartz showing common porphyroblast texture in addition to the descriptive pilotaxitic textures. The more or less availability of the mineral assemblage of chlorite, actinolite, epidote, sericite, zeosite, plagioclase and quartz might support that both the metadacite and metandesite are susceptible to change in temperature and pressure and they were affected by the low greenschist facies metamorphism. The granitoid rocks are recognized as monzogranite, granodiorite and quartz-diorite. All of them showed the traditional petrographic features and mineral composition. However presence of more than one phase of some main minerals in the same rock may indicate successive magmatic crystallization history. The REE data of the studied granitoids points to a complicated origin of these rocks and their arising from volcanic arc-magmatism with significant role of some minerals, e.g. the orthopyroxenes, clinopyroxenes, plagioclases and zircon, found in parent sources of these granitoids. Both the monzogranite and the granodiorite are considered as uraniferous granites and tend to be of fertile type. The uranium seems to be of magmatic origin, particularly in the monzogranite, and linked to the accessory minerals with probable leaching from its bearing partial-metamectized zircon resulted in a disequilibrium state. | ||||
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