The study area is about 40 km 2 that is (8 km × 5 km) which is located in Gwarzo Local Government area of Kano State part of Malumfashi sheet 79NE which lies within Longitude E07°57'19.5" and E08°00'00" and Latitude N11° 51'30"andN11°47'00. Major rock types identified include medium grained biotitemuscovite granite, coarse grained muscovite-biotite granites, quartz-syenite, and quartz-monzonites. Most of the crystals show subhedral to anhedral form and a perfect cleavage is somehow visible. The interference colours observed under cross-polarized light include blue, dark grey, light grey, some pinkish colour and brown colour which disappear upon the stage rotation. Albite and Carlsbad twinning are seen and used to identify the feldspars. Various structural features were observed with NE-SW trend which represents the final imprint of the Pan-African orogeny.

No abstract

The study area shows a distinctive morphological and geochemical continuity from the early formed metasediments, to the metatexite (i.e. the banded orthogneiss and stromatic migmatite), to diatexite (i.e. nebulitic and nebulitic patch migmatite). The geochemistry indicates the decrease in Fe2O3, MgO, and TiO2 in the metatexite and diatexite with increasing silica, indicating feldspar ratio content rise. Also the modal mineralogy based on whole rock composition indicate the metasediment is rich in biotite and corondum, with small amount of quartz. The FeO + MgO vs K2O shows the compositional field and also correspond with mineralogical composition of the studied samples, with the metasediments rich in biotite and cordierite, which decreases as they are transformed to metatexite, with plagioclase and quartz replacing the earlier formed minerals and the nebulitic migmatite rich in K-feldspar.