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• W2061485807 abstract "• Awi Sandstones are mineralogically immature deposited in continental tectonic setting . • Mfamosing limestone is predominantly bioclastic. • Shales are gas prone marginally matured source rocks Type III kerogen. • Shales are deposited in shallow continental to open marine in oxic or anoxic conditions . • They are derived from passive continental margin in plutonic humid palaeoclimatic setting. An integrated sedimentological and geochemical evaluation has been carried out on the Cretaceous sediments of the Calabar Flank. This study is to characterize the provenance, depositional environments and hydrocarbon potentials. The techniques involved field descriptions, textural parameters, petrographic analysis and biostratigraphic studies using standard sedimentological methods. The geochemical studies involved the determination of major oxides and trace elements using Inductively Coupled Plasma–Mass Spectrometry (ICP–MS); Total Organic Carbon (TOC) and Rock Eval Pyrolysis. Results show that sandstone from Awi Formation have elongation ratio ranging from 0.4b to 0.9, oblate–prolate index and maximum sphericity index range from 9.6 to 9.7 and 0.5 to 0.9 respectively. The sandstone units are arkosic and mineralogically immature (MI = 3); ZTR indexes range from 54.6% to 82.5%, with tourmaline, zircon, staurolite, garnet, apatite, augite and rutile grains being angular-sub-angular. This suggests nearness to source, and that Awi Formation was deposited in a fluvial environment. The limestone deposit of Mfamosing Formation is predominantly bioclastic consisting of algal stromatolites, oolitic and pelloidal grainstones/packstones with high carbonate content. The dark grey fissile shales of Nkporo and Ekenkpon Formations indicate deposition in quiet oxic and/or anoxic conditions. Average TOC suggests good source rocks. Predominance of Type III kerogen, T max and hydrocarbon source potential of Mfamosing, Ekenkpon, New Netim Marl and Nkporo Formations suggest marginal mature to mature source rocks deposited in shallow continental to open marine setting that some gas may have been generated. The sediments are derived from passive continental margin in plutonic humid palaeoclimatic setting of continental block province." @default.
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• W2061485807 date "2014-11-01" @default.
• W2061485807 modified "2023-09-25" @default.
• W2061485807 title "Sedimentological and geochemical characterization of the Cretaceous strata of Calabar Flank, southeastern Nigeria" @default.
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• W2061485807 doi "https://doi.org/10.1016/j.jafrearsci.2014.04.035" @default.
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