Geochemical And Mineralogical Composition Of Granitic Rock Deposits Of Michika Area NE Nigeria.

The aim of this study is to determine the geochemical and mineralogical composition of granitic rock deposit of Michika area of northeastern Nigeria. Detailed geological mapping of an area of 188.5 Km2 around Michika area has been mapped on a scale of 1: 50,000. The mapping revealed that the area is underlain by granitic rocks of Pan African Age. These are grouped into three types: coarse grained biotite granites, coarse porphyritic granites and medium grained granites which are intruded by the new basaltic rocks of Tertiary Age. A plot of Rose Diagrams indicate they trend in the NE-SW and NW-SE directions and occurs as irregular or massive bodies, veins and sometimes as a cross-cutting discordant dykes. The fracture ranges from about 5 cm to about 2 meters. Seven samples were collected at different locations representing the three types for petrographic analyses. Petrographic studies show that the samples are essentially composed of quartz, feldspar, mica and iron oxide. Twenty samples were analyzed geochemically using XRF method to determine some major oxides which include SiO2, Al2O3, K2O, Fe2O3 and CaO. The SiO2 content are mainly (70.58%), Al2O3 (14.30%), K2O (5.44%), Fe2O3 (2.73%) and CaO (2.62%) were obtained for the samples. The results indicate that granitic bodies of the Older Granites that underlie the study area are strongly peraluminous calcalkaline igneous series that are of both lithospheric origin or are associated with subduction related areas.

REFERENCES

[1] Bassey N.E (2007) Brittle Deformation Features of Michika Area, Hawal basement complex NE Nigeria Global Journal of Geological Sciences Vol 5 No 1 and 2 pp 50-54

[2] Chappel, B.W and White, A.J.R (1992) I-and S-type granites in the Lachlan Fold Belt Trans of the Royal Society of Edinburg Earth Sciences 83:1-26 http://dol.org/10.1017/S0263593300007720

[3] Dupreeze, J W and Barber, W (1965) The distribution and chemical quality of groundwater in Northern Nigeria Geol. Surv Bull 36, 1-30

[4] Falconer, J. D (1911), The Geology and Geography of Northern Nigeria Mac. London 295pp

[5] Garnier, G.J (1967), Weather Condition in Nigeria. Climatological Research Series no 2 McGrrill University, Montreal Canada.

[6] Jacobson, R.R.E and Webb, J.S (1946) The Pegmatite of Central Nigeria Geological Survey of Nigeria Bull. 17 pp 61

[7] Jimoh, M.T (2011) Petrochemical Studies of Pegmatites around Awo SW Nigeria Jour. Environ.Issues and Agric. In Dev. Countries Vol.3 No 2 pp19-32

[8] Kiser, R.T (1968), Chemical quality of water in Northern Nigeria Geol. Surv. Of Nig. Open File report

[9] Obiefuna G.I and Ngadda I.S (2014) Geological and Mineralogical Composition of Biu Basalt Deposit, Biu Area NE Nigeria Research Journal of Environmental and Earth Sciences Vol 6 No 5 pp 241-250

[10] Peacock, M.A (1931) Classification of Igneous rock series Journal of Geology 39 Pp 54-67

[11] Rittman, A (1962) In Xue, M. Y (2007) Using the Rittman Serial Index to define the alkalinity of Igneous rocks. E Schwetzerbartsche Vealagsbuchandlung Stuttgart Vol 184 No 1 pp 95-103.