| |
|
|
|
Mineralogical, Radiological and Geochemical studies on Wadi Sikait gneisses, South Eastern Desert, Egypt. |
|
|
|
PP: 245-273 |
|
|
|
doi:10.18576/jrna/080308
|
|
|
|
Author(s) |
|
|
|
Ismail, A. M,
|
|
|
|
Abstract |
|
|
| The studied area is located between latitudes 24o38′ 36〃to 24o 39’ 21〃N and longitudes 34o 47′ 03〃 to 34o 48′ 06〃E, which contain psammitic gneiss, ophiolitic mélange, monzogranites, and lamprophyre dykes. The rocks are jointed, sheared, mylonitized, and hematized and showing silicification. Petrographically the gneisses are composed of quartz, plagiocalse, k-feldspar and biotite. Sericitization and chloritization are the main alteration processes. The studied gneisses are considered high uranium high thorium rocks and show evidences of uranium migration. The presence of M-W type tetrad effect in these rocks illustrate vigorous physic-chemical changes associating with gold mineralization. Fractionation of isovalents confirm these changes. The detailed mineralogical studies indicate the presence of mineral groups such as accessory minerals (zircon, apatite, aeschynite and columbite), the radioactive minerals (kasolite, torbernite, thorite, and uranothorite) and base metals (gold, bismite, cassiterite, chalcocite, and Sphalerite). |
|
|
|
|
 |
|
