A Preliminary Petrographic Investigation of Gboko Formation Limestone around Ukogh middle Benue Trough

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Abstract

Limestones of the Gboko Formation, outcropping around Ukogh were studied for their allochemical compositions. Core samples of the limestone were described, logged and subjected to thin sectioning. Quantitative and qualitative petrographic examinations of ten thin sections were performed on selected samples using petrological microscope (ML 9300). The allochemical components identified from thin section include fossils (55 %), pellets (10%), ooids (2 %), microcrystalline calcite (45 %), sparite (28 %) and detrital quartz (av. 45%). Petrographic data and stratigraphic analysis showed that the areas of study is dominated by three facies of limestones; oobiopelsparite, oobiopelmicrite and biopelmicrite, deposited in a shallow agitated subtidal environment. However, this study has provided good petrographic features of the limestone for consideration of other researchers and investors

Keywords: sparite, fossils, microcrystalline calcite, detrital quartz,

References