Earth Sciences

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Browsing Earth Sciences by Author "Abu, Mahamuda"

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    An overview of the geology of Tanga onshore basin: Implication for hydrocarbon potential, Tanzania, East Africa
    (Springer Nature, 2020) Mvile, Benatus Norbert; Abu, Mahamuda; Marobhe, Isaac Muneji; Olayinka, Abel Idowu; Marobhe, Isaac Muneji
    Tanzania, like other East African countries, is seeking to increase its hydrocarbon discoveries from both onshore and offshore sedimentary basins. Although the Tanga onshore basin has the potential of adding to the hydrocarbon reserve of the country, it has very scanty literature to guide preliminary investigations into the basin prospectivity. This review seeks to highlight the petroleum system elements within the basin and how worthy it is exploring for its hydrocarbons potential. The general geology of the basin seems to have characteristics of a complete petroleum system with dolomitic limestone as source rocks and an obvious shale source rock and evidences of fossils and oil seepage around Kivundo River, although further research is needed to validate this assumption. Feldspathic sandstones are present to serve as a reservoir to economic hydrocarbon reserves. The basin has suitable thickness to provide the needed temperature and pressure for thermal maturity of any existing organic matter (OM) and to expel them from their various ‘kitchens’. Brittle structures are available to facilitate the migration of expelled kerogens. Structural straps are available via micro-folds and faults, to ensure the accumulation of economic quantities that could be explored and exploited at profit. Also, the Tanga onshore basin has geological analogies that are similar to other basins’ hydrocarbon discoveries including that in Rovuma, Morondava and Songo Songo basins which are to the south of Tanga onshore basin.
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    Provenance studies of Au-bearing stream sediments and performance assessment of machine learning-based models: insight from whole-rock geochemistry central Tanzania, East Africa
    (Springer Science and Business Media LLC, 2024) Abu, Mahamuda; Mvile, Benatus Norbert; Kalimenze, John Desderius
    The source of clastic sediments generally, can be traced to their source through provenance studies using the whole rock geochemistry of clastic sediments. However, the provenance of the Au-bearing stream sediments within the central parts of Tanzania is yet to be deciphered. Hence, in this study, to enhance exploration targeting, the source of the Au-bearing stream sediments was characterized using whole-rock geochemistry. The performance of linear regression (LR), decision tree (DT), and polynomial regression (PR) models as prediction models for the Au mineralization in the area, were also compared as additional Au exploration techniques worth exploring in the area. The weathering condition proxies, CIA, ICV, CIW, and PIA as well as discriminant diagrams suggest weakly to intensely weathered sediments. The values of SiO2/Al2O3 and K2O/Al2O3 are indicative of felsic source rocks rather than compositional maturity due to sediments reworking. From Th/Cr, Cr/Th, Th/U, La/Sc, and Th/Sc proxies, the Au-bearing stream sediments are sourced from felsic igneous rocks. These indications are corroborated by the correlation matrix assessment. However, Au is not sourced from the same source rocks as the host sediments due probably, to a prior depositional mixing of the sediments before subsequent transportation to their current depositional environment. With R2 (0.62), MAE (0.6035), MSE (0.6546), and RMSE (0.8091) for LR, R2 (1.0), MAE (0.7500), MSE (1.6273), and RMSE (1.2752) for DT, and R2 (1.0), MAE (2.6608), MSE (12.7840), and RMSE (3.5755), for PR. The LR model performs better in predicting the Au occurrence in the area.
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    Soil geochemistry and multivariate statistical assessment of Copper–Gold-PGEs mineralization in parts of Singida Region of the Tanzania Craton, Tanzania, East Africa
    (Springer, 2023) Kalimenze, John Desderius; Abu, Mahamuda; Mvile, Benatus Norbert
    Multi-element mineralization of copper (Cu), gold (Au), and precious group of elements (PGEs) in the Kishapu-Igunga-Iramba areas in the central parts of Tanzania was evaluated in the study. The main aim was to characterize the mineralization with a focus on the pathfinder elements and the controls of the mineralization in the area through soil geochemistry and multivariate statistics and multivariate linear regression (MLR) methods. From the multivariate statistical methods applied, the Cu, Au, and PGEs mineralization in the area is associated with arsenic (As) and antimony (Sb). The Cu and Au occurrence in the area is a likely porphyry Cu-Au from their strong association. The mineralization (multi-elements) is strongly controlled by mafic–ultramafic rocks and volcaniclastics in the northern, southern, and central parts of the study area. From the MLR, Cu is strongly predicted by Zn, Ni, and Au with an error of ± 0.230, with Pd being predicted by only Pt and vice versa, with an error margin of ± 0.001. Au on the other hand is predicted by Cu, Fe, and Cr with an error margin of ± 0.473. The style of mineralization of these elements is comparable to their occurrence in the Neoproterozoic setting and the Paleoproterozoic Ubendian belt of Tanzania as well as the PGEs occurrence in South Africa and Canada. Coupling MLR with hierarchical cluster analysis and factor analysis brings out a more definitive elemental association to precious minerals occurrence from the study and is strongly recommended