PETROGRAPHY, MINERAL COMPOSITION AND
DEPOSITIONAL ENVIRONMENT OF UM BOGMA
FORMATION, UM BOGMA AREA, WEST CENTRAL SINAl,
EGYPT
ADEL A. EL-BASSYOUNI, 1MOHAMED F.
GHANIM, 1AHMED S. MOUSA, 1MAKY A FATHY and 1NAD1A
IBRAHIM
Ain Sham.s University,Faculty of Sciences, Geology Department , Cairo Egypt;
1Egyptian Petroleum Research Institute(EPRI) |
The petrographical studies of Lower Carboniferous Um Bogma Formation indicate that it consists mainly of two clastic and six non-clastic rnicrofacies associations. These are quartz arenite, calcareous sublithic quartz arenite, ferroan dolomite, ferruginous sandy sparite, micrite, dolostone, sparite and sandy sparitic dolostone. Diagenetically. Urn Bogma Formation was subjected to six diagenetic processes such as compaction and pressure solution, dissolution and replacement. micritization, neomorphism, dolomitization, ferruginous replacement and calcification. Mineralogical studies show that the Um Bogma Formation is characterized by the presence of the major minerals such as quartz, dolomite and kaolinite, while the minor minerals include calcite, illite, hematite, geothite and pyrite. Trace halite and copper minerals are present. The integration of’ all available data illustrate that, the depositional environment of Urn Bogma Formation is ranged from tidal flat to shelf lagoon open circulation environment.
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