Browsing by Author "Oloninyi, L. T."

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    Petrography and Structural Characterization of rocks around Ragga part of Kura sheet 189 SW North-Central Nigeria
    (Department of Geology and Mining, Nasarawa State University, Keffi, 2016-11-17) Jatau, B.S.; Oloninyi, L. T.; Bingari, Hanly; Usman, Halima Osu
    The result of the mapping shows that the study area is underlain by the Basement Complex rocks comprising of gneisses, amphibolite, pegmatite and basalt. These host rocks are intruded by pegmatitic, quartz or quartzo-feldspathic veins. Petrographic studies show that the gneisses contain mainly quartz, plagioclase feldspar, muscovite and hornblende. The main minerals in the basalts are phenocrysts of pyroxene, plagioclase, magnetite and groundmass of clinopyroxene. The pegmatite mostly trends in a NE-SW and is mainly made up of quartz, plagioclase and muscovite. Petrographic studies showed that the granite gneiss contains mainly quartz, plagioclase feldspar, muscovite, hornblende and chlorite while the biotite gneiss revealed quartz, plagioclase feldspar, biotite, muscovite, microcline and hornblende. Meanwhile the pegmatites contain mainly quartz, plagioclase, microcline and muscovite with little or no trace of mineralization. The noticeable structures within the rocks in the area include foliation (NE-SWVS), fractures and faults (NE-SW, E-W, NNW-SSE), veins in pegmatite (NE-SW), lineation (NWSE), joints folds and minor faults (N-W, NNE-SSW) that show cataclasis. These structural patterns could be useful in zone of mineralization, mineral concentration and control.