GEOLOGY AND URANIUM, THORIUM DISTRIBUTIONS OF GABAL HUMR AR-RAHA AREA, NORTH EASTERN DESERT, EGYPT | ||||
| Nuclear Sciences Scientific Journal | ||||
| Article 4, Volume 2, Issue 1, 2013, Page 55-68 PDF (15.27 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/nssj.2013.30979 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| AHMED A. ABU STEET | ||||
| Nuclear Materials Authority,Cairo, Egypt | ||||
| Abstract | ||||
| Gabal Humr ar-Raha area, about 150 km2 of crystalline basement rocks, is delineated by Lat. 27o 18’ and 27o 26’ N and Long. 32o 42’ and 32o 48’ E. It is covered by Dokhan volcanics (oldest), younger granites (syenogranite) and post granitic dykes (youngest). Dokhan volcanics are represented by a thick sequence of stratified lava flows of intermediate (andesites) and acidic (rhyolites) composition. The main rock type of Gabal Humr ar-Raha granitoid rocks are classified as syenogranites; their emplacement were structurally controlled by pre-existing fractures trending NNESSW and NE-SW. The acidic Dokhan volcanics and younger granites show the highest equivalent uranium and equivalent thorium contents in the study area. The younger granites can be considered as uraniferous granites as revealed from their radiometric studies. They are originated from highly fractionated U-rich magma that trapping high concentrations of uranium in the accessory minerals. These granites host an interesting radioactive anomalies which are essentially exhibited by a strongly altered granites occupying at the intersection zone of two major strike-slip faults striking NNW-SSE and NE-SW. The sheared granites show dark brown spots of iron oxides at this zone. Thus the enrichment of uranium in the study area is controlled by structural elements. | ||||
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