Study of Origin, Geology and Geochemical Classification of the Granitoids of Imori Area, North Central Nigeria

Authors

  • Joro Joshua Dung Department of Mining Engineering University of Jos, Nigeria
  • Achuenu Ifeanyi Department of Mining Engineering University of Jos, Nigeria

DOI:

https://doi.org/10.31695/IJERAT.2022.8.3.3

Keywords:

Pan-Africa calc-alkaline granite, Mesozoic alkali granite, Ferromagnesian minerals, Sialic materials, Co-magmatic

Abstract

Two distinct generations of granitiods in terms of space and time were identified in the Imori fields of north-central Nigeria. The first generation is the Older Pan-Africa calc-alkaline granite suites (OPACG) which comprise the migmatite-gneiss and the porphyritic hornblende-biotite granite. The second group is the Younger Mesozoic alkali granite suites (YMAG). This comprises rhyolite, biotite granite, and arfvedsonite granite. The OPACG suites are characterized by depletion in SiO2 ranging from 63.30 wt % - 68.38 wt % as compared to the YMAG suites which range from 70.41 wt % - 79.14 wt %. In addition, the OPACG suites are characterized by higher concentrations of MgO, fe2O3, Al2O3, TiO2, CaO, and Sr as compared to the YMAG suites. The YMAG suites are characterized by an excess of total alkaloids (Na2O +K2O), Cr, Nb, W, Ta, and lower concentrations of ferromagnesian minerals. These characteristic indicates that the OPACG suites are generated from deep-seated crustal levels rocks with the possibility of mantle materials. The YMAG suites were originated from partial melting of crustal sialic materials. Both the trace element patterns of the OPACG suites and the YMAG suites indicate that each suite is co-magmatic.

References

Ajibade, A.C., Fitches, W.R. and Wright, J.B. (1987b). Basement covers relationships in the Minna region of the Pan-African domain of Nigeria. Current Res. In: African Earth Science. G. Matheis and H. Schantemeier .

Ajibade, A.C., Woakes, M., Rahaman, M.A. (1987a) Proterozoic crustal development in the Pan-African regime of Nigeria. American Geoph. Union,pp 259-271.

Batchelor R.A. and Bowden P. (1985) Petrogenetic interpretation of granitoid rock series using multicationic parameters [J]. Chem. Geol. 48, 43–55.

Bowden, P.; Black R.; Martin R.F.; Ike E.C.; Kinnaird, J.A. and Batchelor R.A. (1987). Niger-Nigerian alkaline ring-complexes: a classic example of African Phanerozoic anorogenic mid- plate magmatism in Alkaline igneous rocks. (J.G Fitton and B.G.J. Upton) (eds). Goel Soci., special publication, 30, pp 357-379.

Bowden, P. and Kinnaird, J.A. (1984). Geology and mineralization of Nigerian anorogenic ring complexes. Geology (Hannover) B56, pp 3-65.

De la Roche, H., Leterrier, J., Grandclaude, P. and Marchal, M. (1980). A classification of volcanic and plutonic rocks using R1,R2-diagrams and major element analysis—its relationships with current nomenclature. Chemical Geology 29, pp 183–210.

Ekwueme, B.N. (1992). Rb-Sr age of Pan-African migmatites in the Oban massif SE Nigeria. Jour. of Afri.Earth Sci. 15, pp 65-72.

Fitches, W.R., Ajibade, A.C., Eqbuniwe, I.G.. Holt, R.W., and Wright J.B. (1985). Late Proterozoic Schist belt and plutonism in NW Nigeria. Jour. Geol. Soc. London, 142. pp. 319-337

Grant, N.K. (1970). Geochemistry of Precambrian basement rocks from Ibadan. South western Nigeria, Earth Planet. Sci. Let., pp. 29-33

Grant, N.K. (1971). A compilation of radiometric ages from Nigeria: Jour. Mining Geology, V. 6, pp. 37-54.

Grant, N.K. (1978). The structural distinction between a metasedimentary cover and an underlying Basement in the 600 Ma Old Pan-African domain of northwestern Nigeria. Geol. Soc. Amer. Bull., 89, pp. 50-58

Hess, P.C. 1989. Origins of igneous rocks. Cambridge, MA, Harvard University Press

Kinnaird, J.A. (1985). Hydrothermal alteration and mineralization of the alkaline anorogenic ring-complexes of Nigeria.Journal of African Science. Vol 3, pp 229-251.

Maniar P.D. and Piccoli P.M. (1989) Tectonic discrimination of granitoids [J]. Geol. Soc.Am. Bull. 101, 635–643.

McBirney A.R. 1993. Igneous petrology: Second edition. Boston, Jones and Bartlett.

McCurry, P. (1976). The Geology of the Precambrian to Lower Palaeozoic rocks of Northern Nigeria – a review. In Geology of Nigeria, Ed. C.A. Kogbe, pp. 41-51. Elizabethan. Publ. Co. Lagos

Nakamura, N., (1974). Determination of REE, Ba, Fe, Mg, Na and K in carbonaceous and ordinary chondrites. GeochimicaetCosmochimicaActa, 38, pp 757- 775.

Rahaman, M.A. (1976a). Review of the Basement geology of southwestern Nigeria, In Geology of Nigeria, Ed. C.A. Kogbe, pp. 41-51. Elizabethan. Publ. Co. Lagos

Wright, E.P. (1971). Basement Complex. Geol. Surv. Nigeria, Bull. 32(1), pp. 12-47

Downloads

Published

2022-03-16

How to Cite

Study of Origin, Geology and Geochemical Classification of the Granitoids of Imori Area, North Central Nigeria. (2022). International Journal of Engineering Research and Advanced Technology (ijerat) (E-ISSN 2454-6135) , 8(3), 16-29. https://doi.org/10.31695/IJERAT.2022.8.3.3