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- W2024606446 abstract "Lower Cretaceous passive margin sections, penetrated in wells peripheral to the deep basinal development of pre-salt sediments of the Liawenda-Ponta Vermelha Troughs in the Lower Congo Coastal Basin, revealed sustained source potential. Kerogen type, kinetic (Ea/A) and carbon isotopic data plus rock extract biomarker signatures confirmed large, systematic organofacies variations within these rift phase sediments. An inverse correlation between 25,28,30-trisnorhopane and gammacerane abundances suggested three major depositional regimes reflecting salinity and water depth control. 13C-depleted basal sediments, showing strong gammacerane/4-methyl sterane signatures, were segregated by a major isotopic excursion. This event represented the transition between saline playa lake to deeper water stratified conditions supporting a high level of anoxia. For these intermediate sediments, sterane and tricyclic diterpane abundances, plus sterane/hopane ratios, had marine connotations and could be interpreted as the result of intermittent marine incursions. Fore-shadowing irreversible oceanic ingression, a resurgence of gammacerane abundance in the uppermost sediments typified littoral-shallow marine depositional conditions. Recognition of a possible non-ubiquity in lacustrine depositional conditions during the opening of a rifted margin provides further insight into the complexity and attendant controls on hydrocarbon generation in such habitats." @default.
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- W2024606446 date "1992-12-01" @default.
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- W2024606446 title "Rifted margin source rock deposition: a carbon isotope and biomarker study of a West African lower cretaceous “Lacustrine” section" @default.
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- W2024606446 doi "https://doi.org/10.1016/0146-6380(92)90026-t" @default.
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