The lower Carboniferous sediments at SW Sinai comprises four stratigraghic formations from bottom: Um Bogma, El Hashash, Magharet El Maiah and Abu Zarab formations. The uranium bearing sediments are mainly confined and associated with Um Bogma Formation. The stratigraphic sections exposed at the six localities, (Talet Selim, Nasib, Abu Thor, Allouga, Abu Hamata and El Sahu), were studied in detail. These are exposed within a low basinal shaped area that was affected by several fault sets comprising strike-slip and step faults. These faults commonly trending (NW, NE, N-S and E-W) created a mosaic of faulted blocks within and outside the studied area, which to some degree helped the localization of the Uminerals. The sedimentary rocks of the Um Bogma Formation comprise the sedimentary facies: gibbsite bearing sediments, shales, ferruginous siltstone, marl, dolostone, claystone and (Mn-Fe) ore. These sedimentary facies are well developed in the central parts of the studied area (Allouga and Abu Thor). The siltstone, shale and claystone are the main sedimentary facies hosting the U-minerals especially in the lower member of Um Bogma Formation. The U-minerals found within these facies comprise U-oxides, U-silicates, and Uranyl-Oxyhydroxides,silicates,-phosphates, arsenates,-vanadate- ,-molybadate- ,-carbonates and-sulphate complexes. The uranyl phosphate (phurcalite) [Ca 2 (UO 2) 3 (PO 4) 2 (OH) 4 ].4H 2 O, was first detected in the study area. The U-minerals association indicated formation under low temperature (<100 o c) oxidizing conditions with pH range 6-7.5 and high evaporation rate for the precipitation of the uranyl sulphate complexes. The REE patterns of the above sedimentary facies suggest a provenance of recycled old sediments with contributions from plutonic component. These sediments were deposited in an active continental margin. Environment Lithology Member Formation Age Basaltic sheet or/and sill Triassic Fluviatile Glass sand with siltstone intercalations. ____________ Abu Zarab Lower Carboniferous Swamp Carbonaceous shale withLepidodendron Sp.and Sigillaria Sp.

Interpretation was executed on the airborne and ground spectrometric data of Abu-Zeneima/Al-Tor area for verifying the significant anomalies as it contains important targets for prospective nuclear materials. Airborne spectrometric survey revealed that younger granites, are characterized by increase in the three main radioactive elements up to 5.4% K, 10 ppm eU and 33 ppm eTh. The western part of the study area includes sedimentary section which contains uranium-bearing phosphate beds. They are characterized by increase of airborne uranium concentration up to 14.2 ppm without potassium or thorium enrichment. The airborne image maps for eU/eTh and eU/K as well as ternary composite map revealed also that there is a promising U-anomaly, associated with the sedimentary section. Detailed ground spectrometric survey for the Cretaceous Nubian sandstone in Wadi Araba indicated that it is characterized by eU content reaches about 34 ppm, while eTh attains only about 9.8 ppm and potassium is 1.2%. Therefore, the eU/eTh ratio, reaches to a value of 3.4. The same sandstone bed in Abu-Durba Formation possesses eU values reach 67 ppm, whereas eTh values attain 38 ppm and average of potassium is 0.5%. The eU/ eTh ratio is about 2, indicates also enrichment of uranium. The eU reaches a concentration of about 40 ppm in limestone of Matulla Formation whereas, the eTh values attains about 3 ppm and average K is 0.1%. Therefore, the eU/eTh ratio reached 13, due to the limestone is phosphatic. High eU value reaching to 80 ppm is recorded in the limestone facies of Sudr Formation, while the eTh values up to 11 ppm and potassium of about 0.9% are recorded. The eU/eTh ratio value reaching 7.3 indicates the high P 2 O 5 content. A high uranium content is recorded at the northeastern part of El-Qaa plain area in the Sudr Formation reaching 47 ppm, while low eTh values attaining 7.5 ppm and potassium of 0.1% are recorded.

The geology, mineralogy and geochemical of The Kolosh Formation in Dokan area, northern Iraq has been studied. The formation sequence includes gray and dark gray marl that alternate from clastic submarine sediments represented by turbid deposits resulted from the last stages of the collision movement between the continental plates. The geochemical study showed that the Kolosh Formation is mainly dominated by detrital sediments (Clay) with a dominance of kaolinite illite, and albite wıth low amounts of quartz. The analysis revealed that the Kolosh Formation is dominated by relatively marginal marine sedimentation where shelf bay facies was deposited with carbonate facies deposited as shallow marine. In contrast, SiO2 is strongly negatively correlated with CaO and MgO, this supports their derivation from terrigenous sources during the deposition of Kolosh sediments. Keywords: Kolosh Formation, sequences, mineralogy, geochemistry.

The present paper studied the stratigraphic succession of Infra-Cambrian

Gabal Alloga area is located in the southwestern part of the Sinai Peninsula. It represents one of the more significant economic and uranium mineralized areas. It is located within a low basin and most of the high radioactive anomalies recorded in the sediments of Um Bogma Formation within this basin. The Lower Carboniferous Um Bogma Formation is the main rock units constituting the face wall of the Allouga quarry. The wall shows very high radioactivity with eU-contents reaches 3000 ppm. Sklodowskite and carnotite represent the main uranium minerals detected in the face wall of the quarry with anomalous contents of gold. The gold content reaches 1.78, 1.74, 2.02, 1.6, 1.78 and 1.8 ppm in the ferruginous sandstone, dolostone, black shale, marl, claystone and gibbsite, respectively. The structure (faulting), lithology (carbonaceous material and clay minerals in addition to iron oxides), topography (low basin) and biogenic effects (organic matter) are the main factors that controlled the localization and concentration of the uranium and gold minerals within the Um Bogma Formation in the G. Alloga area, especially in Alloga Quarry. In addition to the secondary ascending hydrothermal solutions carry out the radioactive and gold minerals to deposit mainly along with fractures and faults.