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IJSTR >> Volume 4 - Issue 7, July 2015 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Clay Mineralogy Investigation In The Soils Of Arid Almanaqil Ridge, Gezira State, Sudan, Using Xrd Diffractograms

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Elhag A.M.H, Ibrahim M.M.M, Ibrahim S.I, Dafalla M.S



Keywords: Arid soils, Clay mineralogy, Vertisols and X-ray diffractograms.



Abstract: Clay mineralogy was studied in the soils of Arid Almanaqil Ridge. The soils are classified according to the American System (Keys to Soil Taxonomy, 2010) in the fallowing families: Fine loamy, mixed, isohyperthermic, TypicHaplustepts (unit1, sample A1 and A2), Fine, mont, superactive, Isohyperthermic, VerticHaplocambids (unit2, sample A3) and Fine, mont, superactive, isohyperthermic, TypicHaploustert (unit3, sample A4). Representative soil samples were collected from these units. These samples were samples A1 and A2 for unit1, sample A3 for unit 2 and sample A4 for uint3 respectively. Those samples were compared with samples from outside the study area from north of the study area (sample A5 and A6) and from the alluvium of the Blue Nile (sample A7), according to their lithology, topographic position, soil types and soil mapping units. Clay mineralogy of the samples was studied using X-ray diffractograms (XRD) techniques. The XRD diffractograms indicated the presence of smectite, chlorite, illite, and kaolinite as the major clay minerals in the soil of the study area and outside of the study area. The major clay minerals in these soils, Chlorite, illite and kaolinite could have originated from parent material. Smectite, showed an increasing trend in samples A7 (outside of study area) and sample A4 (unit 3). The CEC of clay minerals in unit 1 and 2 were less than 50 Cmol+/kg , which indicated that minerals with low CEC were dominant this result conformed with the XRD results that showed dominance of Chlorite, illite, and Kaolinite. Higher CEC values (more than 50 Cmol+/kg) of the clay were encountered in soils samples from unit3 (A4) and those from outside study area (Sample A7), XRD results showed that the samples were dominated by smectite. Moreover, the CEC values of clay minerals were consistent with results of XRD. The X-ray mineralogy indicated that the Vertisols and Aridisols of the study area had the same origin as that of the Gezira soils.



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