Physicochemical weathering conditions of the characteristic white soil horizon at Al Firjah area and it’s vicinity in North Kordofan State, Central Sudan.
Mineral deposits and valuable materials are deposited, concentrated, and purified by natural processes during long or short time, chemical weathering reactions is a major one. Satelliteimages exhibit distinct white horizon of high reflectance. Investigation of this phenomenonreveals that these areas were associatedwith the distal reaches of the major part of the drainage system. Exposures of the basement rocks include metasediments marl, marble, and other silicate rocks(granite, granodiorite,meta andesite,….etc) at high land where the proximal reaches of the drainage system. These rock were subjected to chemical disintegration process of hydrolysis for silicateconstituent and dissolutionfor carbonate constituent and consequently these material were transportedby the drainage system as colloidal (kaolinite) and dissolved material(calcium cation and bicarbonate), eventually these material were deposited due to evaporation at flash delta to form the kaolinite carbonatesoil at Alfirjah area and it’s vicinity. Field observations in addition to rock and soil sample analysis forearm the above mentioned hypothesis.
- Abdel Rahman, E. M., 1993, Geochemical and Geotectonic Control of the Metallogenic Evolution of Selected Ophiolite Complexes from the Sudan: Berliner, Geowissenschaftliche, Abhadluungen, Reihe A.V.145, 175 pp.
- Abdel Rahman, E.M., and El Mahi, J., 2006, A new discovery of base metals mineralization in north Kordofan, Sudan: implication for Trans-Shield mineralized Corridor: The 9th. Arab conference for mineral resources, Jeddah, Saudi Arabia, p. 33.
- Ali, A. E., and Abdel Rahman, E. M. 2011.New ophiolite occurrences in Sudan and constraint on the western boundary of the Nubian Shield: Petrographical and geochemical evidence: Journal of African\ earth science, Vol.59, p. 101-110.
- Dawood, A.S., 1980, Structural and Metamorphic Evolution of the area Southern of Abohamed ,Nile state, Sudan, Ph.D,University of Khartoum, Sudan, 175pp.
- Elhassan, O. 2014, Geological and Geochemical criteria for Mineralization, North Kordofan state, Ph.D : Omdurman Islamic University, Sudan, 192pp.
- Elsamani, Y., 2010, Metamorphism of Pan- African SEDEX massive sulfide deposits of Abu Samar, Southern Red Sea Hills, Sudan: Journal of Faculty of Science and Technology, Issue No (1), p. 79-87.
- EL Khidir, S. O., 1997, Metamorphic Evolution of Sodari-Ummbadir area-North Kordofan: University of Khartoum, Sudan, M.Sc. 167 pp.
- El Rasheed, A.O., Khalifa, M.A., Elnour, A., and BALLA, A. 2000, Ummbadir and Sodari gold mineralization: GRAS, Unpubl. Report.
- Harms, U., Schandelmeier, H., and Darbyshire, D. P. F., 1990, Pan African reworked early- middle Proterozoic crust in NE Africa west of the Nile: Sr and Nd isotope evidence: J. geol. Soc, Lond, Vol.147, p.859-872.
- Schandelmeier, H., Richter, A. 1991. Brittle shear deformation in Northern Kordofan, Sudan: Late carboniferous to Triassic reactivation of Precambrian fault systems: Journal of Structural. Geol, Vol.13, No.6, p.711-720.
- Thomas, Schlüter, 2005. Geological Atlas of Africa: Springer Berlin Heidelberg New York, 225 pp.
- Vail, J.R., 1985, Alkaline ring complexes in Sudan: J. Aft. Earth Sci., Vol. 3, p.51-59.
- Vail, J.R., 1978, Outline of the geology and mineral deposits of the Democratic Republic of Sudan and adjacent areas: Overseas Geol. Miner.Resour., London. Vol. 49, 67 pp.
- Whiteman, A.J., 1971, The geology of the Sudan Republic: Clarendon Press, Oxford, 290pp.