ABSTRACT Major ions and stable isotopes of groundwater in the Cape Coast granitoid complex (G1) and Lower Birimian (LB) formations in the Eastern Region of Ghana were evaluated to establish the source of recharge to the groundwater system. Five major hydrochemical facies were identified in the various rocks in the study area. They are calcium-magnesium-bicarbonate, sodium bicarbonate, sodium chloride and calcium chloride waters and mixed or non dominant water type. Sodium chloride and calcium chloride waters dominate aqui-fers of the Cape Coast granitoid complex whereas calcium-magnesium-bicarbonate is the dominant hydro-chemical facies in the Lower Birimian aquifers. The most probable geochemical process responsible for the evolution of these hydrochemical facies is dissolution of minerals in the various rock types. Stable isotope composition of the groundwaters established that the recharge to the groundwater system is derived from rainfall.
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nullS. Ganyaglo, B. Banoeng-Yakubo, S. Osae, S. Dampare, J. Fianko and M. A. H. Bhuiyan, "Hydrochemical and Isotopic Characterisation of Groundwaters in the Eastern Region of Ghana," Journal of Water Resource and Protection, Vol. 2 No. 3, 2010, pp. 199-208. doi: 10.4236/jwarp.2010.23022.
 G. O. Kesse, “The mineral and rock resources of Ghana,” Rotterdam, 1985.
J. A. Akudago, K. Kankam-Yeboah, L. P. Chegbeleh, and M. Nashigaki, “Assesment of well design and sustain-ability in hard rock formations in northern Ghana,” Hydrogeology Journal, Vol. 15, pp. 789–798, December 2006.
C. Guler, G. D. Thyne, J. E. McCray, and A. K. Turner, “Evaluation of graphical and multivariate statistical meth-ods for classification of water chemistry data,” Hydro-geology Journal, Vol. 10, pp. 455–473, May 2002.
S. M. Ahmed, P. K. Blay, S. B. Castor, and G. J. Coakley, “Geology of (?)o field sheets Nos. 33 Winneba NE 59, 61, and 62 Accra SW, NW and NE,” Ghana Geological Survey Bulletin, No. 32, 1997.
S. S. Trashliev, “The Geology of ? field sheets 82 (Wiawso SE) and 46 (Asankragwa NE),” Unpublished Report of Ghana Geological Survey, 1974.
B. Banoeng-Yakubo, “Occurrence of groundwater in basement complex rocks of the Upper Regions of Ghana,” M.Sc. dissertation, Obefemi-Awolowo University, Geol-ogy Department, Nigeria, 1989.
B. K. Banoeng-Yakubo, “The application of remote sensing and geographical information systems to hydro-geological studies in the upper west region, Ghana,” Un-published Ph.D. Thesis, University of Ghana, Legon, June 2000.
S. N. Davis and L. J. Turk, “Optimum depth of wells in crystalline rocks, Groundwater,” Vol. 2, No. 2, pp. 6–11, 1964.
R. A. Freeze and J. A. Cherry, “Groundwater,” Prentice Hall, Englewood Cliffs, NJ, USA, 1979.
B. K. Kortatsi, “Hydrochemical characterization of groundwater in the Accra plains of Ghana,” Environ-mental Geology, Vol. 50, pp. 299–311, April 2006.
G. Faure, “Principles and applications of inorganic geo-chemistry,” Prentice Hall, 1991.
H. Craig, “Isotopic variations in meteoric waters,” Sci-ence, Vol. 133, No. 3465, pp. 1702–1703, May 1961.