|
Document Type |
: |
Article In Journal |
|
Document Title |
: |
Radioelements and Uranium Migration in Granites, El-Missikat Tunnels, Central Eastern Desert, Egypt العناصر المشعة وهجرة اليورانيوم في صخور الجرانيت ، أنفاق المسيكات ، الصحراء الشرقية الوسطى ، مصر |
|
Subject |
: |
Earth Sciences |
|
Document Language |
: |
English |
|
Abstract |
: |
Fracture-filling uranium mineralization, connected mainly
to black and jasperoid silica veins, occupying shear and fracture
zones, was detected in 1968-1969 at the northern margin of El-
Missikat post-tectonic granite, Central Eastern Desert, Egypt. Tunnels
and excavations were executed, nearly at Wadi level, following these
shear zones, in order to determine extensions of parts of the tunnels
and evaluate their potentiality. Excavation works revealed the existence
of disseminated pitchblende, as well as its secondary association,
in some drifts of the explored shear zones. The granite along the
shear zone is intensely altered. The main alteration features are silicification,
sericitization and kaolinization. An extensive gamma-ray
spectrometric survey was carried out on some of the mineralized
parts. The obtained data were statistically treated in order to outline
the radiolithological features of the different rock units in the prospect
area. The original uranium content and uranium migration rate were
calculated in order to identify the migration trends in the granite and
its alteration products.
The study shows that there is a close relationship between the
distribution of radioelements and lithology, in which the silica veins
and silicified granites posses the highest radioelement contents. The
migration of uranium took place inward in the brecciated jasperoid
silica, massive silica and silicified granite. Meanwhile, the migration
is outward in the case of pink (unaltered), kaolinized, and sericitized
granites. The results show that, the pink granite has the highest
outward uranium migration rate (?148), followed by the sericitized
granite (up to ?123). The kaolinized granite has the lowest outward
uranium migration (up to ?67). Meanwhile, both silica types the silicified
granite and jasperoid silica show inward uranium migration rate
reach up to 56 and 77, respectively. These results reflect the similarity
between uranium migration in the granitic rocks of El-Missikat prospect
and the nearby El-Erediya prospect, located about 30 km to the
south. |
|
ISSN |
: |
1012-8832 |
|
Journal Name |
: |
Earth Sciences Journal |
|
Volume |
: |
18 |
|
Issue Number |
: |
1 |
|
Publishing Year |
: |
1428 AH
2007 AD |
|
Number Of Pages |
: |
26 |
|
Article Type |
: |
Article |
|
Added Date |
: |
Sunday, October 11, 2009 |
|