The field geology and petrography of the kofayi younger granite complex, central Nigeria

 
 
 
  • Abstract
  • Keywords
  • References
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  • Abstract


    The Kofayi Younger Granite Complex is one of the several anorogenic alkaline Younger Granite Complexes that is located approximately 45 kilometres north east of Jos, Nigeria. The complex is found to comprise of felsic rocks like; biotite-granites, biotite microgranites and granodiorites. They are also found to be associated with mafic rocks like diorites which, at some portions have formed hybrid rocks. Quartz- feldspar- granites are the porphyritic rocks that found in the ring complex. The complex intrude the basement rocks of central Nigeria. Structural trends on these rocks suggest that they were controlled by some deep seated structures of the basement. Mineral suite identified include; fayalite, pyroxene, amphibole, k-feldspar, biotite, quartz, iron- oxide and accessory minerals like zircon, apatite, and allanite. Generally, the petrography of these rock samples reveal the presence of a mafic magma which has two pulses (a mafic and felsic pulse) of injection.

     


  • Keywords


    Kofayi; Granite; Geology; Petrography; Structures.

  • References


      [1] Kinnaird, J.A. (1985): Hydrothermal Alteration and Mineralization of the Alkaline Anorogenic Ring Complex of Nigeria. Journal of African Earth Science. Vol. 3. Pp. 229 – 251. https://doi.org/10.1016/0899-5362(85)90038-7.

      [2] Macleod, W.N; Turner, D.C and Wright, E.P. (1971). The Geology of Jos Plateau. Geol.Surv.Nigeria Bull. No.32. Vol.2. 160pp.

      [3] Middlemost, E.A. (1985): Magmas and Magmatic Rocks. An Introduction to Igneous Petrology. Longman Group, UK. Pp. 73-87.

      [4] Obaje, N.G. (2009): Geology and Mineral Resources of Nigeria. Springer-Verlag. Berlin. 219pp. https://doi.org/10.1007/978-3-540-92685-6.

      [5] Rahaman, M.A. (1988): Recent Advances in the Study of the Precambrian of Nigeria. First Symposium on Precambrian Geology of Nigeria Proceedings, Kaduna. Special Publication of Geological Survey of Nigeria.

      [6] Turner, D.C (1989). Structure and Petrology of the Younger Granite Ring Complexes. In C. A. Kogbe (Ed). Geology of Nigeria. Second Revised Edition. Rock View Ltd.Jos. Pp 175-190.


 

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Article ID: 29055
 
DOI: 10.14419/ijag.v7i2.29055




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