GEOLOGICAL AND GEOCHEMICAL STUDIES ON THE SURFACE AND UBSURFACE URANIFEROUS GRANITES, UM ARA, EASTERN DESERT, EGYPT
Magda Abdel Hakim Khalaf;
Abstract
One diamond drill hole (Ara I) was drilled as a part of the evaluation project for uranium deposits at the northwestern part of Gebel Urn Ara
fine granitic rocks. The drill hole was drilled at-the depth 150.45m. t;
The work deals mainly with geology, petrography. mineralogy. geochemistry and radiometry of the core samples recovered from Ara I bore hole.
The study area is located about 230 kmc to the south east of
Aswan city in the Eastern Desert of Egypt and it is limited by latitudes
22:40. 13and 22" 40• 45N and lon tudes 33" 4T 10= and 33" 1s•
20 E. lt covers an area about 340 km-. ln a chronological sequence. the area around Gebel Urn Ara was found to enclose the following rock units, starting from the oldest: serpentinites. metasediments. metavolcanics, metagabbros, dioritic complex, Dokhan Volcanics. coarse-grained granite and fine-grained granite. Major and minor faults are recognized cutting through the various rock exposures in the prospect area. The most common fault sets are represented by the following directions, WNW-ESE, E- W , NW- SE, ENE-WSW and NNW-SSE.
The detailed studies carried out on the recovered core samples from the studied bore hole Ara I indicate that these samples could be lithologically grouped under six granitic zones that nominated as Gz-1, Gz-2, Gz-3, Gz-4, Gz-5 and Gz-6. The zone boundaries were recognized and delineated (as much as the author can) depending on the megascopic examination and physical discriminations of the core samples.
Gz-1 is the most predom inant zone in the bore hole where it represents 59.95% of the total depth of Ara I. It is characterized by being reddish pink to reddish brown in colour, •medimn to coarse grained. It is also characterized by high core recovery and dominantly lower in alteration and remarked by mainly of K-feldspar and
abundance ofFe-sulphide. • • •
fine granitic rocks. The drill hole was drilled at-the depth 150.45m. t;
The work deals mainly with geology, petrography. mineralogy. geochemistry and radiometry of the core samples recovered from Ara I bore hole.
The study area is located about 230 kmc to the south east of
Aswan city in the Eastern Desert of Egypt and it is limited by latitudes
22:40. 13and 22" 40• 45N and lon tudes 33" 4T 10= and 33" 1s•
20 E. lt covers an area about 340 km-. ln a chronological sequence. the area around Gebel Urn Ara was found to enclose the following rock units, starting from the oldest: serpentinites. metasediments. metavolcanics, metagabbros, dioritic complex, Dokhan Volcanics. coarse-grained granite and fine-grained granite. Major and minor faults are recognized cutting through the various rock exposures in the prospect area. The most common fault sets are represented by the following directions, WNW-ESE, E- W , NW- SE, ENE-WSW and NNW-SSE.
The detailed studies carried out on the recovered core samples from the studied bore hole Ara I indicate that these samples could be lithologically grouped under six granitic zones that nominated as Gz-1, Gz-2, Gz-3, Gz-4, Gz-5 and Gz-6. The zone boundaries were recognized and delineated (as much as the author can) depending on the megascopic examination and physical discriminations of the core samples.
Gz-1 is the most predom inant zone in the bore hole where it represents 59.95% of the total depth of Ara I. It is characterized by being reddish pink to reddish brown in colour, •medimn to coarse grained. It is also characterized by high core recovery and dominantly lower in alteration and remarked by mainly of K-feldspar and
abundance ofFe-sulphide. • • •
Other data
| Title | GEOLOGICAL AND GEOCHEMICAL STUDIES ON THE SURFACE AND UBSURFACE URANIFEROUS GRANITES, UM ARA, EASTERN DESERT, EGYPT | Other Titles | دراسات جيولوجية وجيوكيميائية للصخور الجرانيتية السطحية والتحت سطحية الحاوية لليورانيوم بمنطقة أم أرا الصحراء الشرقية - مصر | Authors | Magda Abdel Hakim Khalaf | Issue Date | 2002 |
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