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Comparative study of groundwater resources in the basement complex and sedimentary terrain of Talata Mafara town and environs, Zamfara State, Northwestern Nigeria

Hamidu H., Abdullahi I. M., Yelwa N. A., Falalu B. H. and Muhammed D.

The Groundwater resources of Talata mafara and its environs have been investigated. The Cretaceous sandy sedimentary aquifer of the Gundumi Formation of fluvio-lacustrine origin and the deeply decomposed crystalline rocks aquifer which are the products of the insitu weathering and decomposition of the crystalline rocks constitute the two aquifers in the area. Comparative studies shows that clean coarser sandy aquifer of the Gundumi formation forms better aquifer with higher yield with average of 4.1 l/s while the weathered / fractured basement aquifer with secondary porosity has a lower average yield of 0.82 l/s with an exceptional higher yield of 6.7 l/s obtained from a deeply decomposed schist. Calculated hydraulic properties for both types of aquifer gives an average transmissivity value of 1.70x 10 m2/s for the Gundumi aquifer while the Crystalline aquifer has an average of 12.80 × 10 m2/s/m. Specific capacity average for the sedimentary aquifer is 1.40 × 10 m2/m/s and the value calculated for the crystalline aquifer is 10.50 × 10 m2/s/m. The computed properties obtained and the yield recorded shows that in the crystalline area, the deeply weathered rocks mainly the schist and metasediment contain more groundwater than the partially weathered granitic rocks. On the average the area has abundant groundwater resources that can meet the water need for human and animal population, with most of it stored in the sandy formation of the Gundumi and the other in the weathered overburden and fractured aquifers of the basement rocks