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Geological mapping of Kaltungo inlier was carried out, and a geological map of the area was produced. The area is dominantly underlain by porphyritic granites, coarse biotite granites and medium grained granites. Bima sandstone and some volcanic rocks mainly basalts intruding the sandstone have also been mapped. However, this work is essentially centralised on the granitic rocks. The samples of the granitic rocks were analysed in the field using hand lens and in the laboratory using a polarizing microscope. The essential minerals identified are quartz, feldspars (albite, orthoclase, microcline and andesine), biotite, hornblende, muscovite and the accessory minerals are sphene, zircon, iron oxide, sericite, limonite, and myrmekite. Though the rocks are all granites, they exhibit some variations in their colour, texture and to some extent their mineral compositions.

Geology and Petrographic Study of the Granitic Rocks of Kaltungo Inlier, Northeastern Nigeria