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| Paper Type | : | Research Paper |
| Title | : | Basinal Configuration And Intrasediment Intrusives As Revealed By Aeromagnetics Data Of South East Sector Of Mamfe Basin, Nigeria. |
| Country | : | Nigeria |
| Authors | : | OBI, D . A . , OBI, E. O., OKIWELU, A. A. |
 |
: | 10.9790/0990-0150108  |
Abstract: Five aeromagnetic maps on a scale of 1:100,000 were analysed using the horizontal gradient magnitude and 2.5D forward modeling method in the South east Sector of mamfe basin Nigeria. The data was manually digitized and filtered using polynomial fitting method to obtain a residual map, reduction to the pole was done after map merging prior to filtering. The HDep and Saki softwares were used in determining the sediments thickness, types of intrusive, and basin configuration. The results identified (17) seventeen intrusives and the basin configuration made of horst and graben structures, the sediment thickness from both methods range between 0.5km–4.3km, the areas with the highest accumulation of sediments (2.6km – 4.3km) is within Edor area in Bansara, these area also has three major intrusives which may serve as a source of heat for thermal maturation or over maturation of these sediments.
Keywords: configuration,forward modeling, polynomial fitting
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| Paper Type | : | Research Paper |
| Title | : | Uranium migration history in the igneous and metamorphic rocks of Solaf-Umm Takha area, based on multi-variate statistical analysis and favorability indices, central south Sinai, Egypt. |
| Country | : | Egypt |
| Authors | : | Tamer E. Attia, El-Arabi H. Shendi |
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: | 10.9790/0990-0150920 |
Abstract: The present study deals with the application of three different analytical techniques on the recorded ground gamma ray spectrometric measurements in order to detect the radioelements content specially Uranium in Solaf-Umm Takha area, south Sinai, Egypt. These techniques include Uranium migration (in and out), Uranium favorability index and multi-variate statistical analysis including first and second principal component and factor scores. The obtained results have indicated that Umm Takha granite and the quartzo – feldspathic gneiss as well as the El-Sheikh granite are Uranium source rocks with low favorability indices. However the application of favorability index technique has proved to be an effective tool in igneous and metamorphic environments to indicate Uranium depletion from source rocks. The integration of original uranium content, uranium migration rate and Uranium favorability index indicated that Uranium migrated from the eastern and southern parts and has been ultimately accumulated in the western and northern parts of the study area. Topographically, uranium has been migrated from the high relief mountainous region to the drainage divide of Solaf-Umm Takha valleys. Therefore, uranium migration history proves its validity in distinction between syngentically-mineralized source rocks and secondary enriched rocks in the investigated area.
Keywords : factor scores, favorability indices, Sinai, spectrometry and uranium migration.
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| Paper Type | : | Research Paper |
| Title | : | Use of Statistical Parameters in the Sedimentological Study of Conglomerate Deposits in Northeastern Part of Akwa Ibom State, Niger Delta Basin, Nigeria |
| Country | : | Nigeria |
| Authors | : | Udo, I. G., Mode, A. W. |
|
: | 10.9790/0990-0152127 |
Abstract: Conglomerates and pebbly sandstone abound along a belt of about 50km long and 11km wide in northeastern part of Akwa Ibom State. Granulometric analysis of 29 samples show the deposits to be poorly to moderately sorted, having sorting coefficient values ranging between 0.63ф to 1.41ф. Pebble morphometric analysis of the conglomerates showed that the mean values of the various morphometric parameters range as follows: flatness ratio (S/L = 0.39-0.58), elongation ratio (I/L =0.64-0.78), maximum projection sphericity (Ψ P = 0.60-0.77), Oblate Prolate index (Ō P = -1.98 to 4.13), coefficient of flatness (39.25-57.86). Roundness index determined for the pebbles through simple comparism with Power's (1953) roundness chart averaged 0.232. Interpretation of pebble morphometric and granulometric results indicate a fluvial environment of deposition for the deposits.
Keywords: Conglomerate, deposit, environment, fluvial, roundness
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