College of Natural Sciences (CoNAS)

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Browsing College of Natural Sciences (CoNAS) by Author "Aber, Martha Ruth"
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    A report on the geological mapping of area J in Igayaza Isingiro District western Uganda.
    (Makerere University., 2023-08-31) Aber, Martha Ruth
    This paper is a complete precis of the objectives, methods, results, interpretations, conclusions, and recommendations of the Igayaza-Isingiro Geological mapping exercise and fieldwork in Southwest Uganda. The mapping project started March 2, 2021 with a one-day briefing on expectations from staff and students and ended on 12th March, 2021 The Geological mapping exercise was conducted in Igayaza, Isingiro district, western Uganda, within the Karagwe-Ankolean system of rocks (ca. 1400-950 Ma), which is the northernmost extension of the Kibaran mobile belt. The materials used during the mapping exercise included a geologic hammer, handheld GPS, notebook, and a compass. After field work, the rock samples collected were sorted and taken to the laboratory for further analysis i.e. petrography and thin section analysis. The data acquired for structures compiled with laboratory data were interpreted and analyzed. The findings were compiled with their interpretation made. The lithology consisted of thin sandstone formations dominated by quartzite, with coarse clay formations forming schist. Quartzites were mainly found on the tops of the ridges, while schists were mainly found along the flanks of the ridges and in the valleys between the ridges. Grades of metamorphism ranged from low-grade regional metamorphism to high-grade regional metamorphism, as evidenced by the presence of strata and index minerals such as chlorite and muscovite. The sandstones and shales turned into quartzites and phyllites.Contact metamorphism occurred near granite incursions that formed most arenas (broad stadium-like structures). The structures in the mapped area include joints, beddings, faults, quartz veins; these were mapped at different scales. The economic potential of the area is low since no economic minerals have been discovered. However, some of the economic activities carried out include; farming, cattle keeping, quarrying and brick making. At the end of the mapping exercise, hotspot presentation were done where students would take lecturers to the most interesting areas, oral presentations were carried out physically on the 4th of April 2022.