Field and Petrographic Relationships between the Charnockitic and Associated Granitic Rock, Akure Area, Southwestern Nigeria
The charnockitic and associated granitic rocks of Akure area were studied for their field and petrographic relationship's. The outcrops locations were plotted in Surfer 8. The granitic rock exhibits a porphyritic texture and outcrops in the north-eastern side of the study area while the charnockitics outcrop in the central/western part. An essentially dark coloured and fine grained intrusive exhibiting xenoliths and xenocrysts (plagioclase phenocrysts) of the granite outcrops between the granitic and charnockitic rocks. Mineralogically, the central rock combines the content of the other two indicating that it is most likely a product of their hybridization. The charnockitic magma is believed to have intruded and assimilated the granite substantially thereby contaminating itself and consequently emplacing the hybrid. The presented model of emplacement elucidates the hybridization proposal. Conclusively, the charnockitics are believed to be (a) younger than the granite, (b) of Pan-African age and (c) of igneous origin.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1078442Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 2870
 J.A. Kilpatrick, and D.J. Ellis, "C-type magmas: igneous charnockites and their extrusive equivalents". Proc. 2nd Hutton Symposium on the Origin of Granites and Related Rocks. Brown, P. E. and Chappell, B. W., (editors), Trans. Roy. Soc. Edinburgh, Earth Sciences, 83 parts 1-2, 507, pp. 155-164, 1992.
 M. O. Oyawoye, "The petrology of the district around Bauchi, Northern Nigeria". Journ. Geology 70, 1962, pp. 604-615.
 M. O. Oyawoye, "The contact relationship of charnockite and biotite gneiss at Bauchi, Northern Nigeria". Geol. Mag. 10, No. 2, 1964, pp 138-144.
 V.O. Olarewaju, "Petrology and geochemistry of the charnockitic and associated granitic rocks of Ado-Ekiti, Akure, S.W. Nigeria". In: Precam. Geol. Nig. Pp 231-239. Geological Survey of Nigeria Publication, 1988.
 M. A. Rahaman, T. R. Ajayi, I. O. Oshin, and F. O. I. Asubiojo, "Trace element geochemistry and geotechnic setting of Ife-Ilesha schist belt". In: Oluyide, P.O., Mbonu, W.C., Ogezi, A.E., Egbuniwe, I.G., Ajibade, A.C., Umeji, A.C (Eds.) Precambrian Geology of Nigeria. Geological Survey of Nigeria, Publication, pp 241-256, 1988.
 S.S. Dada, J.R. Lancelot, and Briqueu, "Age and origin of the annular charnockitic complex at Toro, Northern Nigeria: U-Pb and Rb-Sr evidence". Journal of African Earth Sciences, Vol. 9, Issue 2, 1989, pp 227-234.
 V. O. Olarewaju, "The charnockitic intrusive of Nigeria". In: Oshin, O. (Ed.), The Basement Complex of Nigeria and its Mineral Resources. Akin Jinad & co, Ibadan, Nigeria, 2006, Pp 45-70.
 J.A. Adekoya, O.O. Kehinde-Phillips, and A.M. Odukoya, "Geological distribution of mineral resources in southwest Nigeria". In: A. A. Elueze (Ed.) Prospects for investment in mineral resources of southwestern Nigeria, 2003, pp 1-13.
 M. A. Rahaman, "A review of the basement geology of southwestern Nigeria". In: Kogbe, C. A., (Ed.), Geology of Nigeria. Lagos: Elizabethan Publ. Co., 1976, pp 4-58.
 V.O. Olarewaju, "Charnockite-Granite Association in S.W. Nigeria: Rapakivi granite type and charnockitic plutonism in Nigeria". J. Afri. Earth Sci., 6, No. 1, 1987, pp 67-77.
 F.H. Hubbard, "Precambrian crustal development in Western Nigeria: Indication from the Iwo region". Geol. Soc. Amer. Bull., vol. 86, 1975, pp. 548-554.
 K.A. Shitta, "Lithostratigraphy of Nigeria: An overview". Proceedings of 32nd Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, California, pp: 18-23, Jan. 22-24, 2007.
 A. O. Oyinloye, and R. Obasi, "Geology, geochemistry and geotectonic setting of the Pan-African granites and charnockites around Ado-Ekiti, Southwestern Nigeria". Pakistan Journal of Scientific and Industrial Research, vol. 49, no.5, 2006, pp. 299-308.
 O.A. Ademeso, "Deformation traits in the charnockitic rocks of Akure area, Southwestern Nigeria". Asian Journal of Earth Sciences 2(4), 2009, pp 113-120.
 ImageJ, "Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, California 95054, U.S.A.", known as "ImageJ" version 1.40c, 2008.
 V.O. Olarewaju, "Fluid inclusion studies of coarse-grained charnockitic and the hybrid rocks in Ukpilla area, southwestern Nigeria". Journ. Min. Geol., 35(1), 1999, pp1-7.
 I.B. Odeyemi, "A review of the orogenic events in the Precambrian basement of Nigeria, West Africa". Geologische Rundschau Vol. 70 No.3, 1981, Pp 897-909.
 I.B. Odeyemi, "Lithostratigraphy and structural relationship of the Upper Precambrian metasediments in Igarra area, South-Western Nigeria". Precambrian Geology of Nigeria, Geological Survey of Nigeria. Kaduna, Nigeria, 1988, pp111-125.
 I.A. Tubosun, J.R. Lancelot, M.A. Rahaman, and O.O. Ocan, "U-Pb Pan-African ages of two charnockite-granite". Contrib. Mineral Petrol, 88, 1984, pp188-195.