الفهرس 
GEOLOGICAL SETTINGSOnly 14 pages are availabe for public view
 |  | from | 215 |  |  |
| | | from | 215 | | |
Abstract
The present study is concerned with studying the mineralogical and geochemical characteristics of some mineralized rocks at Um Bogma area, west central Sinai, Egypt. Um Bogma Formation represents the target of the present study due to the occurrence of most mineralizations within it. Thirty eight samples were collected from several localities, which were selected on the basis of their high contents of mineralizations. These localities are Allouga, Abu Thor, Wadi Abu Moghirat, Talet Selim, El Ramsy, El Moerid, Um Hamd, Wadi Sahu, Um Karasi, Ras Rahia and Ramlet Hemyir. Petrographically, Um Bogma Formation is represented by two main facies; these are the nonclastic facies, which constitutes most of the formation, and the clastic facies. The nonclastic facies is represented by dolostones. Two main microfacies were identified within the clastic facies which are the ferruginous sandstone microfacies and the shale microfacies. Moreover, gibbsite mineralizations were studied. The mineralogical study has been carried out using microscopic investigation, Xray diffraction technique (XRD) and the environmental scanning electron microscope (SEM). For the geochemical study, the major oxides and trace elements were measured for the collected samples, while rare earth elements (REE) were measured also for all rock types, except for dolostones. The obtained geochemical data have been compared with some published appropriate data. The radiometric study reveals that U is highly enriched than Th in the studied rock units.