Origin and source characterization of methane in the shallow-water environment of Southern Lake Tanganyika Rift Basin, Tanzania

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dc.contributor.authorBishanga, Januarius Matata
dc.contributor.authorQiang, Jin
dc.date.accessioned2023-05-24T10:39:04Z
dc.date.available2023-05-24T10:39:04Z
dc.date.issued2021
dc.descriptionAbstract. Full text article available at https://currentscience.ac.in/Volumes/120/06/1066.pdfen_US
dc.description.abstractLake Tanganyika, located in the western part of Tanzania between 3°S and 9°S lat, harbours hydrocarbon and non-hydrocarbon gases in its northern and southern shallow-water environment. In this study, a geochemical analysis of stable carbon and hydrogen isotopes and an interpretation of individual gas molecular composition were done in order to determine the origin and composition of the naturally occurring hydrocarbon gases in Tanganyika Basin. Nitrogen, a non-hydrocarbon gas is a major component (76.69%–78.31%) by volume percentage followed by methane (11.68%–12.94%) and other higher hydrocarbons (0.16%–1.63%). The isotopic composition of carbon δ 13C1 and hydrogen δ DC1 ranges from –65.32‰ to –65.81‰ and –272.5‰ to –275.9‰ respectively. The isotopic compositions of ethane (δ DC2 = –36.7‰ to –35.2‰) and propane (δ DC3 = –31.3‰ to –27.5‰) reflect the thermogenic origin of these higher hydrocarbons. According to molecular characterization of carbon and hydrogen isotope ratios and δ D-values, methane gas falls in the biogenic origin category and is formed by carbon dioxide reduction. The isotopic composition of CO2 varies between –8.6‰ and –3.4‰. CO2 reduction is also regarded as a mechanism of biogenic methane formation based on carbon isotope fractionation factors (greater than 0.16).en_US
dc.identifier.citationBishanga, J. M., & Qiang, J. (2021). Origin and source characterization of methane in the shallow-water environment of Southern Lake Tanganyika Rift Basin, Tanzania. Current Science, 120(6), 1066.-1073en_US
dc.identifier.otherURL: https://currentscience.ac.in/Volumes/120/06/1066.pdf
dc.identifier.urihttp://hdl.handle.net/20.500.12661/3928
dc.language.isoenen_US
dc.publisherCurrent Science Associationen_US
dc.subjectBiogenicen_US
dc.subjectisotopic compositionen_US
dc.subjectMethaneen_US
dc.subjectMolecular characterizationen_US
dc.subjectWateren_US
dc.subjectShallow-water environmenten_US
dc.subjectShallow-wateren_US
dc.subjectBiogenic originen_US
dc.subjectLake Tanganyikaen_US
dc.subjectTanganyika rift basinen_US
dc.subjectTanzaniaen_US
dc.titleOrigin and source characterization of methane in the shallow-water environment of Southern Lake Tanganyika Rift Basin, Tanzaniaen_US
dc.typeArticleen_US
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