GEOCHEMICAL AND TECHNOLOGICAL STUDIES FOR SOME MINERALIZED GRANITES IN MAGAL GEBRIEL AREA, SOUTH EASTERN DESERT, EGYPT
MOHAMED GAMAL EL-DIN MAHFOUZ;
Abstract
Magal Gebriel area is located in the extreme southern part of the Eastern Desert of Egypt, southeast Aswan city between latitudes 22° 51' and 22° 58' N, and longitudes 33° 35' and 33° 44' E. It covers about 235 km 2 of crystalline basment rocks. Magal Gebriel was investigated by several workers such as Hume ( 1935); Nassim (1943); El-Shazly et a!. (1965 and 1973) ; Sadek ( 1978 ); Farag (1990) and Kamel (1993). Magal Gebriel area comprises different rock unites which are classified into: Metasediments (oldest), Metavolcanics, Older granitoids, Dokhan volcanics and Younger granites (youngest). The younger granites belong to Gil
granites of Hussein et al. (1982). Magal Gebriel younger granite is allotriomorphic and composed essentially of perthite, quartz, plagioclase, micas ,while fluorite, zircon , garnet, apatite and opaques are accessories. Mineralogical investigations and XRD studies revealed the presence of uranophane, P-uranophane as well as fluorite, phlogopite and zircon. Radiometric studies indicate that the U and Th distribution in Magal Gebriel younger granite is mainly controlled by magmatic processes although some secondary U enrichment processes affecting some samples by adding U leached from other place to them.
Geochemical studies indicate that, the younger granites are classified as alkaline granites and syenogranites having pH20 about
1 kb and they are post-orogenic (1-type) generated in a crust of
thickness more than 20 km, and are comparable with Egyptian younger granites (EI-Gaby, 1975 ; Akaad et al., 1979 ; Rogers and Greenberg, 1983 and EI-Afandy, 1994).
Uranium leaching from Magal Gebriel mineralized granitic sample was performed using H2S04 and the relevant leaching factors were studied. From this study, about 90% of uranium could be leached from the ore ground at -70 mesh size at 40 °C during four hours by using 30 kg/t sulphuric acid and 3/2 solid-liquid ratio.
granites of Hussein et al. (1982). Magal Gebriel younger granite is allotriomorphic and composed essentially of perthite, quartz, plagioclase, micas ,while fluorite, zircon , garnet, apatite and opaques are accessories. Mineralogical investigations and XRD studies revealed the presence of uranophane, P-uranophane as well as fluorite, phlogopite and zircon. Radiometric studies indicate that the U and Th distribution in Magal Gebriel younger granite is mainly controlled by magmatic processes although some secondary U enrichment processes affecting some samples by adding U leached from other place to them.
Geochemical studies indicate that, the younger granites are classified as alkaline granites and syenogranites having pH20 about
1 kb and they are post-orogenic (1-type) generated in a crust of
thickness more than 20 km, and are comparable with Egyptian younger granites (EI-Gaby, 1975 ; Akaad et al., 1979 ; Rogers and Greenberg, 1983 and EI-Afandy, 1994).
Uranium leaching from Magal Gebriel mineralized granitic sample was performed using H2S04 and the relevant leaching factors were studied. From this study, about 90% of uranium could be leached from the ore ground at -70 mesh size at 40 °C during four hours by using 30 kg/t sulphuric acid and 3/2 solid-liquid ratio.
Other data
| Title | GEOCHEMICAL AND TECHNOLOGICAL STUDIES FOR SOME MINERALIZED GRANITES IN MAGAL GEBRIEL AREA, SOUTH EASTERN DESERT, EGYPT | Other Titles | دراسات جيوكيميائية وتكنولوجية لبعض التمعدنات المشعة بالصخور الجرانيتية فى منطقة مجال جبريل جنوب الصحراء الشرقية ، مصر. | Authors | MOHAMED GAMAL EL-DIN MAHFOUZ | Issue Date | 1998 |
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